Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Itsushi Uno Last modified date:2020.06.16

Professor / Research Institute for Applied Mechanics Global Environmental Dynamics / Division of Earth Environment Dynamics / Research Institute for Applied Mechanics

1. Yongjoo Choi, Yugo Kanaya, Seung Myung Park, Atsushi Matsuki, Yasuhiro Sadanaga, Sang Woo Kim, Itsushi Uno, Xiaole Pan, Meehye Lee, Hyunjae Kim, Dong Hee Jung, Regional variability in black carbon and carbon monoxide ratio from long-term observations over East Asia
Assessment of representativeness for black carbon (BC) and carbon monoxide (CO) emission inventories, Atmospheric Chemistry and Physics, 10.5194/acp-20-83-2020, 20, 1, 83-98, 2020.01, The black carbon (BC) and carbon monoxide (CO) emission ratios were estimated and compiled from longterm, harmonized observations of the ΔBC/ΔCO ratios under conditions unaffected by wet deposition at four sites in East Asia, including two sites in South Korea (Baengnyeong and Gosan) and two sites in Japan (Noto and Fukuoka). Extended spatio-temporal coverage enabled estimation of the full seasonality and elucidation of the emission ratio in North Korea for the first time. The estimated ratios were used to validate the Regional Emission inventory in ASia (REAS) version 2.1 based on six study domains ("East China", "North China", "Northeast China", South Korea, North Korea, and Japan). We found that the ΔBC/ΔCO ratios from four sites converged into a narrow range (6.2-7.9 ngm-3 ppb-1), suggesting consistency in the results from independent observations and similarity in source profiles over the regions. The BC/CO ratios from the REAS emission inventory (7.7 ngm-3 ppb-1 for East China - 23.2 ngm-3 ppb-1 for South Korea) were overestimated by factors of 1.1 for East China to 3.0 for South Korea, whereas the ratio for North Korea (3.7 ngm-3 ppb-1 from REAS) was underestimated by a factor of 2.0, most likely due to inaccurate emissions from the road transportation sector. Seasonal variation in the BC/CO ratio from REAS was found to be the highest in winter (China and North Korea) or summer (South Korea and Japan), whereas the measured ΔBC/ΔCO ratio was the highest in spring in all source regions, indicating the need for further characterization of the seasonality when creating a bottom-up emission inventory. At levels of administrative districts, overestimation in Seoul, the southwestern regions of South Korea, and Northeast China was noticeable, and underestimation was mainly observed in the western regions in North Korea, including Pyongyang. These diagnoses are useful for identifying regions where revisions in the inventory are necessary, providing guidance for the refinement of BC and CO emission rate estimates over East Asia..
2. Itsushi Uno, Zhe Wang, Syuichi Itahashi, Keiya Yumimoto, Yuki Yamamura, Ayako Yoshino, Akinori Takami, Masamitsu Hayasaki, Byung Gon Kim, Paradigm shift in aerosol chemical composition over regions downwind of China, Scientific reports, 10.1038/s41598-020-63592-6, 10, 1, 2021.04, A rapid decrease in PM2.5 concentrations in China has been observed in response to the enactment of strong emission control policies. From 2012 to 2017, total emissions of SO2 and NOx from China decreased by approximately 63% and 24%, respectively. Simultaneously, decreases in the PM2.5 concentration in Japan have been observed since 2014, and the proportion of stations that satisfy the PM2.5 environmental standard (daily, 35 µg/m3; annual average, 15 µg/m3) increased from 37.8% in fiscal year (FY) 2014 (April 2014 to March 2015) to 89.9% in FY 2017. However, the quantitative relationship between the PM2.5 improvement in China and the PM2.5 concentration in downwind regions is not well understood. Here, we (1) quantitatively evaluate the impacts of Chinese environmental improvements on downwind areas using source/receptor analysis with a chemical transport model, and (2) show that these rapid emissions reductions improved PM2.5 concentrations both in China and its downwind regions, but the difference between SO2 and NOx reduction rates led to greater production of nitrates (e.g., NH4NO3) due to a chemical imbalance in the ammonia–nitric acid–sulfuric acid–water system. Observations from a clean remote island in western Japan and numerical modeling confirmed this paradigm shift..
3. Yumimoto, K., Kajino, M., Tanaka, T. Y. and Uno, I., Dust Vortex in the Taklimakan Desert by Himawari-8 High Frequency and Resolution Observation, Sci. Rep., doi:10.1038/s41598-018-37861-4, 9(1), 1209, 2019.02.
4. Wang, Z., Uno, I., Yumimoto, K., Pan, X., Chen, X., Li, J., Wang, Z., Shimizu, A., and Sugimoto, N., Dust Heterogeneous Reactions during Long-Range Transport of a Severe Dust Storm in May 2017 over East Asia, Atmosphere, doi:10.3390/atmos10110680, 10(11)680, 2019.11.
5. Zhe Wang, Xiaole Pan, Itsushi Uno, Xueshun Chen, Shigekazu Yamamoto, Haitao Zheng, Jie Li, Zifa Wang, Importance of mineral dust and anthropogenic pollutants mixing during a long-lasting high PM event over East Asia, Environmental Pollution, 10.1016/j.envpol.2017.11.068, 234, 368-378, 2018.03, A long-lasting high particulate matter (PM) concentration episode persisted over East Asia from May 24 to June 3, 2014. The Nested Air Quality Prediction Model System (NAQPMS) was used to investigate the mixing of dust and anthropogenic pollutants during this episode. Comparison of observations revealed that the NAQPMS successfully reproduced the time series PM2.5 and PM10 concentrations, as well as the nitrate and sulfate concentrations in fine (aerodynamic diameter ≤ 2.5 μm) and coarse mode (2.5 μm < aerodynamic diameter ≤ 10 μm). This episode originated from two dust events that occurred in the inland desert areas of Mongolia and China, and then the long-range transported dust and anthropogenic pollutants were trapped over the downwind region of East Asia for more than one week due to the blocked north Pacific subtropical high-pressure system over the east of Japan. The model results showed that mineral dust accounted for 53–83% of PM10, and 39–67% of PM2.5 over five cities in East Asia during this episode. Sensitivity analysis indicated that the Qingdao and Seoul regions experienced dust and pollution twice, by direct transport from the dust source region and from dust detoured over the Shanghai area. The results of the NAQPMS model confirmed the importance of dust heterogeneous reactions (HRs) over East Asia. Simulated dust NO3
concentrations accounted for 75% and 84% of total NO3
in fine and coarse mode, respectively, in Fukuoka, Japan. The horizontal distribution of model results revealed that the ratio of dust NO3
/dust concentration increased from about 1% over the Chinese land mass to a maximum of 8% and 6% respectively in fine and coarse mode over the ocean to the southeast of Japan, indicating that dust NO3
was mainly formed over the Yellow Sea and the East China Sea before reaching Japan. Capsule abstract: Mineral dust and related heterogeneous reactions had dominant impacts on the concentration of PM as well as nitrate and sulfate over East Asia during a long-lasting high PM episode..
6. Tomoaki Nishizawa, Nobuo Sugimoto, Atsushi Shimizu, Itsushi Uno, Yukari Hara, Rei Kudo, Aerosol observation using multi-wavelength Mie-Raman lidars of the Ad-Net and aerosol component analysis, 28th International Laser Radar Conference, ILRC 2017 EPJ Web of Conferences, 10.1051/epjconf/201817609005, 176, 2018.04, We deployed multi-wavelength Mie-Raman lidars (MMRL) at three sites of the AD-Net and have conducted continuous measurements using them since 2013. To analyze the MMRL data and better understand the externally mixing state of main aerosol components (e.g., dust, sea-salt, and black carbon) in the atmosphere, we developed an integrated package of aerosol component retrieval algorithms, which have already been developed or are being developed, to estimate vertical profiles of the aerosol components. This package applies to the other ground-based lidar network data (e.g., EARLINET) and satellite-borne lidar data (e.g., CALIOP/CALIPSO and ATLID/EarthCARE) as well as the other lidar data of the AD-Net..
7. Xiaole Pan, Itsushi Uno, Zhe Wang, Shigekazu Yamamoto, Yukari Hara, Zifa Wang, Seasonal variabilities in chemical compounds and acidity of aerosol particles at urban site in the west Pacific, Environmental Pollution, 10.1016/j.envpol.2017.11.089, 237, 868-877, 2018.06, Mass concentrations of chemical compounds in both PM2.5 (particle aerodynamic diameter, Dp < 2.5 μm) and PM2.5-10 (2.5 < Dp < 10 μm), and acidity of aerosol particles were measured at an urban site in western Japan using a continuous dichotomous Aerosol Chemical Speciation Analyzer (ACSA-12) throughout 2014. Mass concentrations of both PM2.5 and sulfate had distinct seasonal variabilities with maxima in spring and winter, mostly due to long-range transport with the prevailing westerly wind. Mass concentration of nitrate in PM2.5 (fNO3) showed an obvious warm-season-low and cold-season-high pattern as a result of both gas-aerosol phase equilibrium processes under high temperature conditions as well as transport. Nitrate in PM2.5-10 (cNO3) increased during long-range transport of dust, implying the great importance of heterogeneous processes at the surface of coarse mode particles. In this study, Δ[H+] (derived from the difference in pH of extract liquid with/without sampling) was used to indicate the acidity of particles. We found that acidity of particles in PM2.5 (fΔH) was mostly positive with a maximum in August because of the large fraction of nitrate and sulfate. Acidity of particles in PM2.5-10 (cΔH) was negative in winter and spring due to presence of alkaline matter from crustal sources. This study highlights the great importance of anthropogenic pollutants on the acidity of particles in the western Pacific Ocean and further impact on the marine environment and climate. Meteorology and transport played a key role in the allocation of aerosol phase nitrate in PM2.5, PM2.5-10. Seasonal variability of acidity of PM2.5 was mainly attributed to fraction of water-soluble secondary inorganics and source regions..
8. Yukari Hara, Tomoaki Nishizawa, Nobuo Sugimoto, Kazuo Osada, Keiya Yumimoto, Itsushi Uno, Rei Kudo, Hiroshi Ishimoto, Retrieval of aerosol components using multi-wavelength Mie-Raman lidar and comparison with ground aerosol sampling, Remote Sensing, 10.3390/rs10060937, 10, 6, 2018.06, We verified an algorithm using multi-wavelength Mie-Raman lidar (MMRL) observations to retrieve four aerosol components (black carbon (BC), sea salt (SS), air pollution (AP), and mineral dust (DS)) with in-situ aerosol measurements, and determined the seasonal variation of aerosol components in Fukuoka, in the western region of Japan. PM
, PM
, and mass concentrations of BC and SS components are derived from in-situ measurements. MMRL provides the aerosol extinction coefficient (α), particle linear depolarization ratio (δ), backscatter coefficient (β), and lidar ratio (S) at 355 and 532 nm, and the attenuated backscatter coefficient (β
) at 1064 nm. We retrieved vertical distributions of extinction coefficients at 532 nm for four aerosol components (BC, SS, AP, and DS) using 1α
+ 1β
+ 1β
+ 1δ
data of MMRL. The retrieved extinction coefficients of the four aerosol components at 532 nm were converted to mass concentrations using the theoretical computed conversion factor assuming the prescribed size distribution, particle shape, and refractive index for each aerosol component. MMRL and in-situ measurements confirmed that seasonal variation of aerosol optical properties was affected by internal/external mixing of various aerosol components, in addition to hygroscopic growth of water-soluble aerosols. MMRL overestimates BC mass concentration compared to in-situ observation using the pure BC model. This overestimation was reduced drastically by introducing the internal mixture model of BC and water-soluble substances (Core-Gray Shell (CGS) model). This result suggests that considering the internal mixture of BC and water-soluble substances is essential for evaluating BC mass concentration in this area. Systematic overestimation of BC mass concentration was found during summer, even when we applied the CGS model. The observational facts based on in-situ and MMRL measurements suggested that misclassification of AP as CGS particles was due to underestimation of relative humidity (RH) by the numerical model in lidar analysis, as well as mismatching of the optical models of AP and CGS assumed in the retrieval with aerosol properties in the actual atmosphere. The time variation of lidar-derived SS was generally consistent with in-situ measurement; however, we found some overestimation of SS during dust events. The cause of this SS overestimation is mainly due to misclassifying internally mixing DS as SS, implying that to consider internal mixing between DS and water-soluble substances leads to better estimation. The time-variations of PM
and PM
generally showed good agreement with in-situ measurement although lidar-derived PM
and PM
overestimated in dust events..
9. Yu Tian, Xiaole Pan, Tomoaki Nishizawa, Hiroshi Kobayashi, Itsushi Uno, Xiquan Wang, Atsushi Shimizu, Zifa Wang, Variability of depolarization of aerosol particles in the megacity of Beijing
Implications for the interaction between anthropogenic pollutants and mineral dust particles, Atmospheric Chemistry and Physics, 10.5194/acp-18-18203-2018, 18, 24, 18203-18217, 2018.12, East Asia is suffering from severe air pollution problems due to intensive anthropogenic emissions and natural mineral dust aerosols. During transport, the aerosol particles undergo complex mixing processes, resulting in great impacts on regional air quality, human health and climate. In this study, we conducted a long-term observation using an optical particle counter equipped with a polarization detection module (POPC) at an urban site in Beijing. Mass concentrations of both PM
and PM
estimated from POPC compared well with ground-based measurements. The results revealed that the observed depolarization ratio (δ, termed as the ratio of the intensity of the s-polarized signal to the intensity of the 120° backward scattering signal Ts=.s Cp/U) for aerosol particles in the fine mode was generally much lower in summer than that in spring as a result of predominance of different aerosol types. Mineral dust particles in the coarse mode normally had a large δ value (0:3±0:05) owing to their nonspherical shape; however, particles in the fine mode mostly had water-soluble compositions, which led to an apparent decrease of their δ values in particular high relative humidity (RH) conditions. Because the observation site was subject to the impact of frequent dust events in spring, the δ value of particle at 1 μm was almost twice as high as that (0:07±0:01) in summer. Based on size-resolved δ values, anthropogenic pollutants, mineral dust and polluted mineral dust particles and their contribution to local air quality could be well distinguished. About 26.7% of substandard days (daily averaged PM
concentration larger than 75 μgm
) in Beijing featured high atmospheric loading of coarse-mode particles in winter and springtime. In particular, during severe pollution episodes in winter, the δ values of coarse-mode particles decreased by 13 %, which implies a high possibility of dust-related heterogeneous processes in pollution formation. During dust events, δ values of particles with optical size (Dp) of 5 μm evidently decreased, with an increase of the PM
ratio as well as RH, indicating the morphological changes of mineral dust. This study confirmed that high RH tends to promote water absorption processes on the dust surface as well as the coating of soluble compounds, and suggested that remote sensing techniques for aerosols may underestimate the impact of dust particles due to the complex mixing of dust and anthropogenic particles in urban areas, and the interaction between dust particles and pollutants should be considered well by the optical model..
10. Xiaole Pan, Baozhu Ge, Zhe Wang, Yu Tian, Hang Liu, Lianfang Wei, Siyao Yue, Itsushi Uno, Hiroshi Kobayashi, Tomoaki Nishizawa, Atsushi Shimizu, Pingqing Fu, Zifa Wang, Synergistic effect of water-soluble species and relative humidity on morphological changes in aerosol particles in the Beijing megacity during severe pollution episodes, Atmospheric Chemistry and Physics, 10.5194/acp-19-219-2019, 19, 1, 219-232, 2019.01, Depolarization ratio (δ) of backscattered light is an applicable parameter for distinguishing the sphericity of particles in real time, which has been widely adopted by groundbased lidar observation systems. In this study, δ values of particles and chemical compositions in both PM2:5 (aerodynamic diameter less than 2.5 μm) and PM10 (aerodynamic diameter less than 10 μm) were concurrently measured on the basis of a bench-top optical particle counter with a polarization detection module (POPC) and a continuous dichotomous aerosol chemical speciation analyzer (ACSA-14) from November 2016 to February 2017 at an urban site in Beijing megacity. In general, measured δ values depended on both size and sphericity of the particles. During the observation period, mass concentrations of NO-3 in PM
) were about an order of magnitude higher than that in PM
) with a mean fNO
ratio of 14±10. A relatively low fNO
ratio (∼ 5) was also observed under higher relative humidity conditions, mostly due to heterogeneous processes and particles in the coarse mode. We found that δ values of ambient particles in both PM
and PM
obviously decreased as mass concentration of water-soluble species increased at unfavorable meteorological conditions. This indicated that the morphology of particles was changed as a result of water-absorbing processes. The particles with optical size (Dp) of DpD5 μm were used to represent mineral dust particles, and its δ values (δDpD5) decreased by 50% as the mass fraction of cNO
increased from 2% to 8% and ambient relative humidity increased up to 80 %, suggesting that mineral dust particles were likely to be spherical during humid pollution episodes. During the observation, relative humidity inside the POPC measuring chamber was stable at 34±2 %, lower than the ambient condition. Its influence on the morphology was estimated to be limited and did not change our major conclusion. This study highlights the evident alteration of non-sphericity of mineral dust particles during their transport owing to a synergistic effect of both pollutant coatings and hygroscopic processes, which plays an important role in the evaluation of its environmental effect..
11. Keiya Yumimoto, Mizuo Kajino, Taichu Y. Tanaka, Itsushi Uno, Dust Vortex in the Taklimakan Desert by Himawari-8 High Frequency and Resolution Observation, Scientific reports, 10.1038/s41598-018-37861-4, 9, 1, 2019.12, The Taklimakan Desert is known to be one of the world’s major sources of aeolian dust particles. Continuous images with 10-min temporal and 2-km spatial resolutions from a new-generation geostationary meteorological satellite captured the lifecycle (generation, evolution and outflow) of a previously unrecognized type of Taklimakan dust storm. The dust storm showed an anti-clockwise spiral structure and a clear core and behaved like a “dust vortex”. From image analysis, the horizontal scale and temporal lifetime of the dust vortex were estimated to be 600 km and 36 hours, respectively. We found that a strong pressure trough (cut-off low), along with a cold air mass located on the northwestern side of the Taklimakan Desert and the high mountains surrounding the Taklimakan Desert, played important roles in the formation and evolution of the dust vortex..
12. Wang, Z., @Pan, X., Uno, I., @Li, J., @Wang, Z., @Chen, X., @Fu. P., @Yang, T., @Kobayashi, H., @Shimizu, A., @Sugimoto, N., @Yamamoto, S., Significant impacts of heterogeneous reactions on the chemical composition and mixing state of dust particles: A case study during dust events over northern China, Atmospheric Environment, 0.1016/j.atmosenv.2017.03.044, 59, 83-91, 2017.03.
13. Uno, I., Yumimoto, K., @Osada, K., @Wang, Z., @Pan, X., @Itahashi, S. and @Yamamoto, S., Dust Acid Uptake Analysis during Long-Lasting Dust and Pollution Episodes over East Asia Based on Synergetic Observation and Chemical Transport Model, SOLA, 10.2151/sola.2017-020, 13(0), 109-113, 2017.06.
14. Miho Kiriya, Tomoaki Okuda, Hana Yamazaki, Kazuki Hatoya, Naoki Kaneyasu, Itsushi Uno, Chiharu Nishita, Keiichiro Hara, Masahiko Hayashi, Koji Funato, Kozo Inoue, Shigekazu Yamamoto, Ayako Yoshino, Akinori Takami, Monthly and diurnal variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, measured by diffusion charging method, ATMOSPHERE, 10.3390/atmos8070114, 8, 7, 2017.06, Observation of the ambient aerosol surface area concentrations is important to understand the aerosol toxicity because an increased surface area may be able to act as an enhanced reaction interface for certain reactions between aerosol particles and biological cells, as well as an extended surface for adsorbing and carrying co-pollutants that are originally in gas phase. In this study, the concentration of aerosol surface area was measured from April 2015 to March 2016 in Fukuoka, Japan. We investigated the monthly and diurnal variations in the correlations between the aerosol surface area and black carbon (BC) and sulfate concentrations. Throughout the year, aerosol surface area concentration was strongly correlated with the concentrations of BC, which has a relatively large surface area since BC particles are usually submicron agglomerates consisting of much smaller (tens of nanometers) sized primary soot particles. The slopes of the regression between the aerosol surface area and BC concentrations was highest in August and September 2015. We presented evidence that this was caused by an increase in the proportion of airmasses that originated on the main islands of Japan. This may enhance the introduction of the BC to Fukuoka from the main islands of Japan which we hypothesize to be relatively fresh or "uncoated", thereby maintaining its larger surface area..
15. Itsushi Uno, Kazuo Osada, Keiya Yumimoto, Zhe Wang, Syuichi Itahashi, Xiaole Pan, Yukari Hara, Yugo Kanaya, Shigekazu Yamamoto, Thomas Duncan Fairlie, Seasonal variation of fine- and coarse-mode nitrates and related aerosols over East Asia
Synergetic observations and chemical transport model analysis, Atmospheric Chemistry and Physics, 10.5194/acp-17-14181-2017, 17, 23, 14181-14197, 2017.11, We analyzed long-term fine- and coarse-mode synergetic observations of nitrate and related aerosols (SO2 4 , NO3 , NHC4 , NaC, Ca2C) at Fukuoka (33.52 N, 130.47 E) from August 2014 to October 2015. A Goddard Earth Observing System chemical transport model (GEOS-Chem) including dust and sea salt acid uptake processes was used to assess the observed seasonal variation and the impact of long-range transport (LRT) from the Asian continent. For fine aerosols (fSO2 4 , fNO3 , and fNHC4 ), numerical results explained the seasonal changes, and a sensitivity analysis excluding Japanese domestic emissions clarified the LRT fraction at Fukuoka (85% for fSO2 4 , 47% for fNO3 , 73% for fNHC4 ). Observational data confirmed that coarse NO3 (cNO3 ) made up the largest proportion (i.e., 40-55 %) of the total nitrate (defined as the sum of fNO3 , cNO3 , and HNO3) during the winter, while HNO3 gas constituted approximately 40% of the total nitrate in summer and fNO3 peaked during the winter. Large-scale dust-nitrate (mainly cNO3 ) outflow from China to Fukuoka was confirmed during all dust events that occurred between January and June. The modeled cNO3 was in good agreement with observations between July and November (mainly coming from sea salt NO3 ). During the winter, however, the model underestimated cNO3 levels compared to the observed levels. The reason for this underestimation was examined statistically using multiple regression analysis (MRA).We used cNaC, nsscCa2 C, and cNHC4 as independent variables to describe the observed cNO3 levels; these variables were considered representative of sea salt cNO3 , dust cNO3 , and cNO3 accompanied by cNHC4 ), respectively. The MRA results explained the observed seasonal changes in dust cNO3 and indicated that the dust-acid uptake scheme reproduced the observed dust-nitrate levels even in winter. The annual average contributions of each component were 43% (sea salt cNO3 ), 19% (dust cNO3 ), and 38% (cNHC4 term). The MRA dust-cNO3 component had a high value during the dust season, and the sea salt component made a large contribution throughout the year. During the winter, cNHC4 term made a large contribution. The model did not include aerosol microphysical processes (such as condensation and coagulation between the fine anthropogenic aerosols NO3 and SO2 4 and coarse particles), and our results suggest that inclusion of aerosol microphysical processes is critical when studying observed cNO3 formation, especially in winter..
16. Xiaole Pan, Yugo Kanaya, Fumikazu Taketani, Takuma Miyakawa, Satoshi Inomata, Yuichi Komazaki, Hiroshi Tanimoto, Zhe Wang, Itsushi Uno, Zifa Wang, Emission characteristics of refractory black carbon aerosols from fresh biomass burning
A perspective from laboratory experiments, Atmospheric Chemistry and Physics, 10.5194/acp-17-13001-2017, 17, 21, 13001-13016, 2017.11, The emission characteristics of refractory black carbon (rBC) from biomass burning are essential information for numerical simulations of regional pollution and climate effects.We conducted combustion experiments in the laboratory to investigate the emission ratio and mixing state of rBC from the burning of wheat straw and rapeseed plants, which are the main crops cultivated in the Yangtze River Delta region of China. A single particle soot photometer (SP2) was used to measure rBC-containing particles at high temporal resolution and with high accuracy. The combustion state of each burning case was indicated by the modified combustion efficiency (MCE), which is calculated using the integrated enhancement of carbon dioxide and carbon monoxide concentrations relative to their background values. The mass size distribution of the rBC particles showed a lognormal shape with a mode mass equivalent diameter (MED) of 189 nm (ranging from 152 to 215 nm), assuming an rBC density of 1.8 g cm-3. rBC particles less than 80 nm in size (the lower detection limit of the SP2) accounted for ∼5% of the total rBC mass, on average. The emission ratios, which are expressed as ΔrBC =ΔCO (Δ indicates the difference between the observed and background values), displayed a significant positive correlation with the MCE values and varied between 1.8 and 34 ngm-3 ppbv-1. Multi-peak fitting analysis of the delay time (Δt, or the time of occurrence of the scattering peak minus that of the incandescence peak) distribution showed that rBC-containing particles with rBC MED = 200±10 nm displayed two peaks at Δt = 1.7 μs and Δt = 3.2 μs, which could be attributed to the contributions from both flaming and smoldering combustion in each burning case. Both the Δt values and the shell / core ratios of the rBC-containing particles clearly increased as the MCE decreased from 0.98 (smoldering-dominant combustion) to 0.86 (flaming-dominant combustion), implying the great importance of the rapid condensation of semi-volatile organics. This laboratory study found that the mixing state of rBC particles from biomass burning strongly depends on its combustion processes, and overall MCE should be taken carefully into consideration while the climate effect of rBC particles from open biomass burning is simulated..
17. Zhe Wang, Syuichi Itahashi, Itsushi Uno, Xiaole Pan, Kazuo Osada, Shigekazu Yamamoto, Tomoaki Nishizawa, Kei Tamura, Zifa Wang, Modeling the long-range transport of particulate matters for january in East Asia using NAQPMS and CMAQ, Aerosol and Air Quality Research, 10.4209/aaqr.2016.12.0534, 17, 12, 3065-3078, 2017.12, Two regional chemical transport models were applied to simulate high concentrations of particulate matters (PM) observed in East Asia in January 2015; the first model is the Nested Air Quality Prediction Modeling System (NAQPMS) and the second is the Community Multi-scale Air Quality Model (CMAQ). The variation of PM2.5 in both models showed well agreement with measurements over both eastern China and western Japan. Based on the model results and the aerosol compositions observed in Fukuoka in western Japan, three types of PM long-range transport (LRT) were identified: N-, S-, and D-type. The N episode showed higher fine-mode nitrate (fNO3) concentrations than fine-mode sulfate (fSO42–), indicating the importance of NO3 LRT. The S episode showed the highest fSO42– concentrations (28.9 µg m–3), which were 3.4-fold higher than fNO3, due to high relative humidity. During the D episode, dust stagnated in Fukuoka for three days, due to the influence of low- and high-pressure systems; thus, dust LRT is also important in winter besides spring. Both models reasonable explained variations in aerosol components during both N and S episodes; however, both underestimated fSO42– especially during D episode, suggesting that they may miss certain emissions or chemical mechanisms. High coarse-mode NO3 (cNO3) concentrations (maximum: 6.3 µg m–3), and high cNO3/fNO3 ratios (maximum: 1.2) were observed during D episode. NAQPMS successfully captured this cNO3 peak after including heterogeneous reactions on dust. Our results emphasize the importance of such heterogeneous processes for understanding the LRT of dust and anthropogenic pollutants over East Asia..
18. Itsushi Uno, Kazuo Osada, Keiya Yumimoto, Zhe Wang, Syuichi Itahashi, Xiaole Pan, Yukari Hara, Shigekazu Yamamoto, Tomoaki Nishizawa, Importance of long-range nitrate transport based on long-term observation and modeling of dust and pollutants over East Asia, Aerosol and Air Quality Research, 10.4209/aaqr.2016.11.0494, 17, 12, 3052-3064, 2017.12, Long-term synergetic fine and coarse mode aerosol observations were analyzed at 1-h intervals at Fukuoka, Japan, from January to June 2015. The GEOS-Chem chemical transport model, including dust and sea-salt acid uptake processes, was used for detailed analysis of observation data. Several Asian dust events and long-range anthropogenic aerosol transport events were observed during our analysis period, and the numerical model generally explained the observed time variation for both fine and coarse mode aerosols. We found that (i) the majority of fine mode NO3 can be considered as long-range transport (LRT) outside of Japan during the cold season, and (ii) the peak timing of fine mode NO3 coincided with that of SO4 , indicating that both aerosols are controlled by LRT. Also, an observed mass concentration ratio of NO3 /SO4 2– > 0.9 occurred during the cold season, indicating the importance of NO3 as a major contributor to the PM2.5 mass fraction. Finally, we clearly showed that large-scale dust-nitrate outflow from China to Fukuoka was confirmed in all cases of dust events, indicating that the anthropogenic NOx is converted to dust-nitrate and transported to Japan with dust. These results demonstrate the importance of anthropogenic NO3 LRT during the cold season and dust-nitrate LRT for all dust events (even in June)..
19. Syuichi Itahashi, Keiya Yumimoto, Itsushi Uno, Hiroshi Hayami, Shin Ichi Fujita, Yuepeng Pan, Yuesi Wang, A 15-year record (2001-2015) of the ratio of nitrate to non-sea-salt sulfate in precipitation over East Asia, Atmospheric Chemistry and Physics, 10.5194/acp-18-2835-2018, 18, 4, 2835-2852, 2018.02, Acidifying species in precipitation can have severe impacts on ecosystems. The chemical composition of precipitation is directly related to the amount of precipitation; accordingly, it is difficult to identify long-term variation in chemical concentrations. The ratio of the nitrate (NO3) to non-sea-salt sulfate (nss-SO42) concentration in precipitation on an equivalent basis (hereinafter, Ratio) is a useful index to investigate the relative contributions of these acidifying species. To identify the long-term record of acidifying species in precipitation over East Asia, the region with the highest emissions worldwide, we compiled ground-based observations of the chemical composition of precipitation over China, Korea, and Japan from 2001 to 2015 based on the Acid Deposition Monitoring Network in East Asia (EANET). The spatial coverage was limited, but additional monitoring data for Japan, southern China, and northern China around Beijing were utilized. The period of analysis was divided into three phases: Phase I (2001-2005), Phase II (2006-2010), and Phase III (2011-2015). The behaviors of NO3 and nss-SO42 concentrations and hence the Ratio in precipitation were related to these precursors. The anthropogenic NOx and SO2 emissions and the NOxg•SO2 emission ratio were analyzed. Further, satellite observations of the NO2 and SO2 column density to capture the variation in emissions were applied. We found that the long-term trend in the NO3 concentration in precipitation was not related to the variation in NOx emission and the NO2 column. In comparison, the nss-SO42 concentration in precipitation over China, Korea, and Japan was partially connected to the changes in SO2 emissions from China, but the trends were not significant. The long-term trends of Ratio over China, Korea, and Japan were nearly flat during Phase I, increased significantly during Phase II, and were essentially flat again during Phase III. This variation in Ratio in East Asia clearly corresponded to the NOxg•SO2 emission ratio and the NO2g•SO2 column ratio in China. The initial flat trend during Phase I was due to increases in both NOx and SO2 emissions in China, the significantly increasing trend during Phase II was triggered by the increase in NOx emissions and decrease in SO2 emissions in China, and the return to a flat trend during Phase III was caused by declines in both NOx and SO2 emissions in China. These results suggest that emissions in China had a significant impact not only on China but also on downwind precipitation chemistry during the 15-year period of 2001-2015. In terms of wet deposition, the NO3 wet deposition over China, Korea, and Japan did not change dramatically, but the nss-SO42 wet deposition declined over China, Korea, and Japan from Phase II to III. These declines were caused by a strong decrease in the nss-SO42 concentration in precipitation accompanied by a reduction in SO2 emission from China, which counteracted the increase in precipitation. These findings indicated that the acidity of precipitation shifted from sulfur to nitrogen..
20. Xiaole Pan, Itsushi Uno, Zhe Wang, Tomoaki Nishizawa, Nobuo Sugimoto, Shigekazu Yamamoto, Hiroshi Kobayashi, Yele Sun, Pingqing Fu, Xiao Tang, Zifa Wang, Real-time observational evidence of changing Asian dust morphology with the mixing of heavy anthropogenic pollution, Scientific reports, 10.1038/s41598-017-00444-w, 7, Article number: 335, 2017.03.
21. Syuichi Itahashi, Itsushi Uno, Kazuo Osada, Yusuke Kamiguchi, Shigekazu Yamamoto, Kei Tamura, Zhe Wang, Nitrate transboundary heavy pollution over East Asia in winter, 10.5194/acp-17-3823-2017, 17, 3823-3843, 2017.03.
22. Syuichi Itahashi, Hiroshi Hayami, 弓本 桂也, Itsushi Uno, Chinese province-scale source apportionments for sulfate aerosol in 2005 evaluated by the tagged tracer method, 220, 1366-1375, 2017.03.
23. Keiya Yumimoto, Itsushi Uno, Xiaole Pan, Tomoaki Nishizawa, Sang-Woo Kim, Nobuo Sugimoto, Inverse Modeling of Asian Dust Emissions with POPC Observations:A TEMM Dust Sand Storm 2014 Case Study, 10.2151/sola.2017-006, 13, 31-35, 2017.03.
24. Itsushi Uno, Keiya Yumimoto, Xiaole Pan, Zhe Wang, Kazuo Osada, Syuichi Itahashi, Shigekazu Yamamoto, Simultaneous Dust and Pollutant Transport over East Asia:The Tripartite Environment Ministers Meeting March 2014 Case Study, 10.2151/sola.2017-009, 13, 47-52, 2017.03.
25. Tomoaki Nishizawa, Nobuo Sugimoto, Ichiro Matsui, Atsushi Shimizu, Yukari Hara, Itsushi Uno, Kazuaki Yasunaga, Rei Kudo, Sang-Woo Kim, Ground-based network observation using Mie–Raman lidars and multi-wavelength Raman lidars and algorithm to retrieve distributions of aerosol components, 188, 79-93, 2017.02.
26. Yukari Hara, Tomoaki Nishizawa, Nobuo Sugimoto, Ichiro Matsui, Xiaole Pan, Hiroshi Kobayashi, Kazuo Osada, Itsushi Uno, Optical properties of mixed aerosol layers over Japan derived with multi-wavelength Mie–Raman lidar system, 188, 20-27, 2017.02.
27. Hitoshi Irie, Takuya Muto, Syuichi Itahashi, Jun-ichi Kurokawa, Itsushi Uno, Turnaround of Tropospheric Nitrogen Dioxide Pollution Trends in China, Japan, and South Korea , 10.2151/sola.2016-035, 12, 170-174, 2016.07.
28. Syuichi Itahashi, Hiroshi Hayami, Itsushi Uno, Xiaole Pan, Mitsuo Uematsu, Importance of coarse-mode nitrate produced via sea salt as atmospheric input to East Asian oceans, 10.1002/2016GL068722, 43, 10, 5483-5491, 2016.05.
29. Zhe Wang, Xiaole Pan, Jie LI, Zifa Wang, Pingqing FU, Ting YANG, Hiroshi KOBAYASHI, Atsushi SHIMIZU, Nobuo SUGIMOTO, Shigekazu YAMAMOTO, Itsushi Uno, Significant impacts of heterogeneous reactions on the chemico-physical properties of dust particles during severe dust events over East Asia in 2015, 150, 14-24, 2016.03.
30. Xiaole Pan, Itsushi Uno, Yukari Hara, Kazuo Osada, Shigekazu Yamamoto, ZHE WANG, Nobuo Sugimoto, Hiroshi Kobayashi, Zifa Wang, Polarization properties of aerosol particles over western Japan: classification, seasonal variation, and implications for air quality, 10.5194/acp-16-9863-2016, 16, 9863-9873, 2016.08.
31. Syuichi Itahashi, Itsushi Uno, Hiroshi Hayami, Shin-ichi Fujita, Variation of the ratio of nitrate to non-seasalt sulfate in precipitation over East Asia with emissions from China, 118, 87-97, 2015.07.
32. Xiaole Pan, Itsushi Uno, Yukari Hara, Masatoshi Kuribayashi, S. Yamamoto, T. Shimohara, Annual variability in chemical properties of particulate matter in Fukuoka based on measurements using an Aerosol Chemical Speciation Analyzer, 148, 101-109, 2015.03.
33. Itahashi, S., H. Hayami, Itsushi Uno, Comprehensive study of emission source contributions for tropospheric ozone formation over East Asia, 10.1002/2014JD022117, 2015.01.
34. Xiaole Pan, Itsushi Uno, Yukari Hara, Masatoshi Kuribayashi, N. Sugimoto, S. Yamamoto,, T. Shimohara, Z. Wang, Observation of the simultaneous transport of Asian mineral dust aerosols with anthropogenic pollutants using a POPC during a long-lasting dust event in late spring 2014, 10.1002/2014GL062491, 2015.03.
35. Yumimoto, K., Itsushi Uno, S. Itahashi:, Long-term inverse modeling of Chinese CO emission from satellite, 195, 308-318, 2014.12.
36. Itsushi Uno, N.Sugimoto, A. Shimizu, K. Yumimoto, Yukari Hara, Z. Wang, Record heavy PM2.5 air pollution over China in January 2013: Vertical and horizontal dimensions, 10.2151/sola.2014-028, 10, 136-140, 2014.09.
37. S. Itahashi, Itsushi Uno, H. Hayami, S. Fujita, Modeling investigation of controlling factors in the increasing ratio of nitrate to non-seasalt sulfate in precipitation over Japan, Atmospheric Environment, 92, 171-177, 2014.01.
38. Itsushi Uno, N.Sugimoto, A. Shimizu, K. Yumimoto, Yukari Hara, Z. Wang, Record heavy PM2.5 air pollution over China in January 2013: Vertical and horizontal dimensions., Japan Meteorological Society, 10, 136-140, 2014.07.
39. Liu, Z., T. D. Fairlie, Itsushi Uno, J. Huang, D. Wu, A. Omar, J. Kar, M. Vaughan, R. Rogers, D. Winker, C. Trepte, Y. Hu, W. Sun, B. Lin, A. Cheng, Transpacific transport and evolution of the optical properties of Asian dust, Journal of Quantitative Spectroscopy and Radiative Transfer, 116, 24-33, 2013.02.
40. Itahashi, S., Itsushi Uno, H.Irie, J.Kurokawa, T.Ohara, Trend analysis of tropospheric NO2 column density over East Asia during 2000-2010: multi-satellite observations and model simulations with the updated REAS emission inventory, Atmospheric Chemistry and Physics, 14, 3623-3635, 2014.04.
41. Itahashi, S., I.Uno, S.-B.Kim, Seasonal source contributions of tropospheric ozone over East Asia based on CMAQ/HDDM, Atmospheric Environment, 70, 204-217, 2013.07.
42. Yamaji, K., I.Uno, and H.Irie, Investigating the response of East Asian ozone to Chinese emission changes using a linear approach, Atmospheric Environment, 55, 475-482, 2012.03.
43. Yumimoto, K.,I. Uno,N. Sugimoto,A. Shimizu, Y. Hara and T. Takemura, Size-resolved adjoint inversion of Asian dust, Geophysical Research Letters, doi:10.1029/2012GL053890, 39, L24807, 2012.12.
44. Itahashi, S., I.Uno and S.-T.Kim, Source Contribution of Sulfate Aerosol over East Asia estimated by CMAQ-DDM, Environmental Science & Technology , 46, 6733-6741, 2012.07.
45. Liu, Z., T. D. Fairlie, I. Uno,J. Huang, D. Wu, A. Omar, J. Kar, M. Vaughan, R. Rogers, D. Winker, C. Trepte, Y. Hu, W. Sun, B. Lin and A. Cheng, Transpacific transport and evolution of the optical properties of Asian dust, Journal of Quantitative Spectroscopy and Radiative Transfer, 116, 24-33, 2013.01.
46. Itahashi, S., I.Uno and S.-B.Kim, Seasonal source contributions of tropospheric ozone over East Asia based on CMAQ/HDDM, Atmospheric Environment, 70, 204-217, 2013.02.
47. Uno, I., Eguchi, K., Yumimoto, K., Liu, Z., Hara, Y., Sugimoto, N., Shimizu, A., and Takemura, T., Large Asian dust layers continuously reached North America in April 2010, Atmospheric Chemistry and Physics, doi:10.5194/acp-11-7333-2011, 11, 7333-7341, 2011.06.
48. Syuichi Itahashi, Itsushi Uno, Keiya Yumimoto, Hitoshi Irie, Kazuo Osada, K. Ogata, Hajime Fukushima, Zifa Wang, Toshimasa Ohara, Interannual variation in the fine-mode MODIS aerosol optical depth and its relationship to the changes in sulfur dioxide emissions in China between 2000 and 2010, Atmospheric Chemistry and Physics, 12, 2631-2640, 2012.05.
49. Kenta Eguchi, Itsushi Uno, Keiya Yumimoto, ToshihikoTakemura, Takashi Y. Nakajima, Mitsuo Uematsu, Zhaoyan Liu, Modulation of Cloud Droplets and Radiation over the North Pacific by Sulfate Aerosol Erupted from Mount Kilauea, SOLA, 7, 77-80, 2011.06.
50. Yukari Hara, Itsushi Uno, Atsushi Shimizu, Nobuo Sugimoto, Ichiro Matsui, Keiya Yumimoto, Jun-ichi Kurokawa, Toshimasa Ohara, Zhaoyan Liu, Seasonal characteristics of spherical aerosol distribution in eastern Asia: Integrated analysis using ground/space-based lidars and a chemical transport model, SOLA, 7,121-124, 2011.08.
51. S.-B. Kim, K. Yumimoto, I. Uno and Y.-S. Chun, Dust Model Intercomparison Between ADAM and CFORS/Dust For Asian Dust Case in 2007 (March 28 - April 3), SOLA, Vol. 7A, pp.25-28, 2011.03.
52. Sugimoto,N., Y.Hara, A. Shimizu, K. Yumimoto, I. Uno and M. Nishikawa, Comparison of surface observations and a regional dust transport model assimilated with Lidar network data in Asian dust event of March 29 to April 2, 2007, SOLA, Vol. 7A, pp.13-16, 2011.01.
53. Morino, Y., T. Ohara, J. Kurokawa, M. Kuribayashi, I. Uno, and H. Hara, Temporal variations of nitrogen wet deposition across Japan from 1989 to 2008, Journal of Geophysical Research, doi:10.1029/2010JD015205, 116, D06307, 2011.02.
54. Iwamoto, Y., K. Yumimoto, M. Toratani, A. Tsuda, K. Miura, I. Uno, and M. Uematsu, Biogeochemical implications of increased mineral particle concentrations in surface waters of the northwestern North Pacific during an Asian dust event , Geophysical Research Letters, doi:10.1029/2010GL045906, 38 , L01604, 2011.02.
55. Ge, B. Z., Wang, Z. F., Xu, X. B., Tang, J., He, Y. J., Uno, I., and Ohara, T., Impact of the East Asian summer monsoon on long-term variations in the acidity of summer precipitation in Central China, Atmospheric Chemistry and Physics , 11, 1671-1684, 2010.08.
56. Itahashi,S., K.Yumimoto, I.Uno, K.Eguchi, T. Takemura, Y. Hara, A. Shimizu, N.Sugimoto and Z. Liu, Outflow Structure of Dust and Air Pollutants over springtime East Asia, Geophysical Research Letters, doi:10.1029/2010GL044776, 37, L20806, 2010.10.
57. Yumimoto, K., K. Eguchi, I. Uno, T. Takemura, Z. Liu, A. Shimizu, N. Sugimoto, and K. Strawbridge, Summertime trans-Pacific transport of Asian dust, Geophysical Research Letters, 10.1029/2010GL043995, 2010.09, 黄砂の発生は春季が多く、従来多くの研究が行われてきた。また、春季には太平洋を横断して北米大陸や地球を一周して湯されることが示されているが、下記についての事例やモデル解析は行われていない。我々は夏季に中国内陸域で発生した黄砂が日本上空を越えて、北米大陸まで到達することを衛星データとモデル解析から明瞭に示すことに成功した。これはアジア起源の黄砂が夏季にもグローバルな大気環境や大気放射に大きな影響を示すものである。.
58. Yamaji, K., J. Li, I. Uno, Y. Kanaya, Y. Komazaki, P. Pochanart, Y. Liu, M. Takigawa, T. Ohara, X. Yan, Z. Wang, and H. Akimoto, Impact of open crop residual burning on air quality over Central Eastern China during the Mount Tai Experiment 2006 (MTX2006), Atmospheric Chemistry and Physics, 10, 7353-7368,, 2010.09.
59. Tanimoto, H., T. Ohara, and I. Uno, Asian anthropogenic emissions and decadal trends in springtime tropospheric ozone over Japan: 1998-2007, Geophysical Research Letters , 10.1029/2009GL041382, 2009.12.
60. Onitsuka, G., Uno, I., Yanagi Y., and Yoonm J.-H., Modeling the effects of atmospheric nitrogen input on biological production in the Japan Sea, Journal of Oceanography, Vol. 65, pp. 433 to 438, 2009.06.
61. Li, J., Z. Wang, H. Akimoto, J.Tang and I. Uno, Modeling of the impacts of China's anthropogenic pollutants in the surface ozone summer maximun on the northen Tibetan Plateau, Geophysical Research Letters , 10.1029/2009GL041123, 2009.12.
62. Noguchi,K., H.Itoh, T.Shibasaki, S. Hayashida, I. Uno, T. Ohara, A. Richter andJ.P. Burrows, Comparison of tropospheric NO2 observations by GOME and the air-quality monitoring network around Tokyo, Japan, 日本リモートセンシング学会誌, 29, 398-409, 2009.12.
63. Osada, K., T. Ohara, I. Uno, M. Kido, and H. Iida, Impact of Chinese SO2 emissions on submicron aerosol concentration at Mt. Tateyama, Japan, Atmospheric Chemistry and Physics Discussions, 9, 9111-9120, 2009.12.
64. Yumimoto, K., Eguchi, K., Uno, I., Takemura, T., Liu, Z., Shimizu, A., and Sugimoto, An elevated large-scale dust veil from the Taklimakan Desert: Intercontinental transport and three-dimensional structure as captured by CALIPSO and regional and global models, Atmospheric Chemistry and Physics, 9, 8545-8558, 2009.11.
65. Uno, I., K. Eguchi, K. Yumimoto, T. Takemura, A. Shimizu, M. Uematsu, Z. Liu, Z. Wang, Y. Hara & N. Sugimoto, Asian dust transported one full circuit around the globe, Nature Geoscience, 10.1038/NGEO0583, 2, 8, 2009.08.
66. J. Kurokawa, T. Ohara, I. Uno, M. Hayasaki, and H. Tanimoto, Influence of meteorological variability on interannual variations of the springtime boundary layer ozone over Japan during 1981–2005, Atmospheric Chemistry and Physics Discussions, 9, 6287-6304, 2009.09.
67. Kurokawa, J., Yumimoto, K., Uno, I., and Ohara, T., Adjoint inverse modeling of NOx emissions over eastern China using satellite observations of NO2 vertical column densities, Atmospheric Environment, Volume 43, Issue 11, Pages 1827-1944, 2009.01.
68. Hara, Y., Yumimoto, K., Uno, I., Shimizu, A., Sugimoto, N., Liu, Z., and Winker, D. M., Asian dust outflow in the PBL and free atmosphere retrieved by NASA CALIPSO and an assimilated dust transport model, Atmospheric Chemistry and Physics, 9, 1227-1239, 2009.01.
69. Eguchi, K., Uno, I., Yumimoto, K., Takemura, T., Shimizu, A., Sugimoto, N., and Liu, Z., Trans-Pacific dust transport: integrated analysis of NASA/CALIPSO and a global aerosol transport model, Atmospheric Chemistry and Physics, 9, 3137-3145., 2009.05.
70. Yamaji, K., T. Ohara, I. Uno, J. Kurokawa, P. Pochanart, and H. Akimoto, Future Prediction of Surface Ozone over East Asia using Models-3 Community Multiscale Air Quality Modeling System (CMAQ) and Regional Emission Inventory in ASia (REAS), Journal of Geophysical Research , doi:10.1029/2007JD008663, 2008.03.
71. Tanimoto, H., Sawa, Y., Yonemura, S., Yumimoto, K., Matsueda, H., Uno, I., Hayasaka, T., Mukai, H., Tohjima, Y., Tsuboi, K., and L. Zhang, Diagnosing recent CO emissions and ozone evolution in East Asia using coordinated surface observations, adjoint inverse modeling, and MOPITT satellite data, Atmospheric Chemistry and Physics, 8, 3867-3880, 2008.04.
72. Liu,Z., D. Liu, J. Huang, M. Vaughan, I. Uno, N. Sugimoto, C. Kittaka, C. Trepte, Z. Wang, C. Hostetler, and D. Winker, Airborne dust distributions over the Tibetan Plateau and surrounding areas derived from the first year of CALIPSO lidar observations, Atmospheric Chemistry and Physics Discussions, 2008.04.
73. Yumimoto, K., I. Uno, N. Sugimoto, A. Shimizu, Z. Liu, and D. M. Winker, Adjoint inversion modeling of Asian dust emission using lidar observations, Atmospheric Chemistry and Physics, 8, 2869-2884, 2008.03.
74. He, Y. J., I. Uno, Z. Wang, P. Pochanart, J. Li, and H. Akimoto, Significant impact of the East Asia monsoon on ozone seasonal behavior in the boundary layer of Eastern China and the west Pacific region, Atmospheric Chemistry and Physics, 8, 14927-14955, 2008.08.
75. Yumimoto, K., I. Uno, N. Sugimoto and A. Shimizu, MODIS AOT Based Inverse Modeling for Asian Dust, SOLA, Vol. 4, pp.89-92, 2008.10.
76. Uno, I., K. Yumimoto, A. Shimizu, Y. Hara, N. Sugimoto, Z. Wang, Z. Liu, and D. M. Winker, 3D structure of Asian Dust Transport revealed by CALIPSO Lidar and a 4DVAR Dust Model, Geophysical Research Letters, 35, doi:10.1029/2007GL032329, 2008.03.
77. Yumimoto, K., I. Uno, N. Sugimoto, A. Shimizu, A. Liu, and D. M. Winker, Numerical Modeling of Asian Dust Emission and Transport by Adjoint Inversion using Lidar Observation Network, Atmospheric Chemistry and Physics Discussions, Vol.7, 15955-15987, 2007.11.
78. Uno I., M. Uematsu, Y. Hara, Y. J. He, T. Ohara, A. Mori, T. Kamaya, K. Murano, Y. Sadanaga, H. Bandow, Numerical study of the atmospheric input of anthropogenic total nitrate to the marginal seas in the western North Pacific region, Geophysical Research Letters, 34, L17817, doi:10.1029/2007GL030338, 2007.09.
79. He, Y. J., I. Uno, Z. Wang, T. Ohara, N. Sugimoto, A. Shimizu, A. Richter, and J. P. Burrors, Variations of the increasing trend of tropospheric NO2 over central east China during the past decade, Atmospheric Environment, 41, 4865-4876, 2007.07.
80. Yumimoto, K., I. Uno, N. Sugimoto, A. Shimizu, and S. Satake, Adjoint Inverse Modeling of Dust Emission and Transport over East Asia, Geophysical Research Letters, 34, 8, L08806, doi:10.1029/2006GL028551, 2007.04.
81. Uno, I., Y. J. He, T. Ohara, K. Yamaji, J. Kurokawa, M. Katayama, Z. Wang, K. Noguchi, S. Hayashida, A. Richter, and J. P. Burrows, Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO2 in Asia and comparison with GOME-satellite data, Atmospheric Chemistry and Physics, Vol. 7, 1671-1681, 2007.03.
82. Yumimoto, K. and I. Uno, Adjoint inverse modeling of CO emission over the East Asian region using for dimensioonal variational data assimilation, Atmospheric Environment, 40, 6836-6845, 2006.11.
83. Hara, Y., I. Uno and Z. Wang, Long-term variation of Asian dust and related climate factor, Atmospheric Environment, 40, 6730-6740, 2006.11.
84. I. Uno, Z. Wang, M. Chiba, Y. S. Chun, S. L. Gong, Y. Hara, E. Jung, S.-S. Lee, M. Liu, M. Mikami, S. Music, S. Nickovic, S. Satake, Y. Shao, Z. Song, N. Sugimoto, T. Tanaka, and D. L. Westphal, Dust model intercomparison (DMIP) study over Asia: Overview, Journal of Geophysical Research, Vol. 111, D12213, doi: 10.1029/2005JD006575, 2006.06.
85. Kazuyo Yamaji, Toshimasa Ohara, Itsushi Uno, Hiroshi Tanimoto, Jun-ichi Kurokawa, Hajime Akimoto, Analysis of the seasonal variation of ozone in the boundary layer in East Asia using the Community Multi-scale Air Quality model: What controls surface ozone levels over Japan?, Atmospheric Environment, 40, 1856-1868, 2006.01.
86. Itsushi Uno, Yukari Hara and Sinsuke Satake, Numerical Analysis of Inter-Annual Variation of Dust Emission and Transport in East Asia, Journal of Agricultural Meteorology, 60(5), 513-518, 2005.02.
87. Wlodec Zahorowski, Scott Chambers, Tao Wang, Chang-Hee Kang, Itsushi Uno,Steven Poon, Sung-Nam Oh, Sylvester Werczynski, Jiyoung Kim and Ann Henderson-Sellers, Radon-222 in boundary layer and free tropospheric continental outflow events at three ACE-Asia sites, Tellus, 10.1111/j.1600-0889.2005.00133.x, 57, 2, 124-140, 57B, 124-140, 2005.02.
88. Itsushi Uno, Kazuhiro Harada, Shinsuke Satake, Yukari Hara and Zifa Wang, Meteorological Characteristics and Dust Distribution of the Tarim Basin Simulated by the Nesting RAMS/CFORS Dust Model, Journal of the Meteorological Society of Japan, 10.2151/jmsj.83A.219, 83A, 219-239, Vol.83A, pp.219-239, 2005.02.
89. Tanimoto, H., Y. Sawa, H. Matsueda, I. Uno,T. Ohara, K. Yamaji, J. Kurokawa and S. Yonemura, Significant latitudinal gradient in the surface ozone spring maximum over East Asia, Geophysical Research Letters, 10.1029/2005GL023514, 32, 21, Vol. 32、L21805、doi:10.1029/2005GL023514, 2005.01.
90. C. B. Park, N. Sugimoto, I. Matsui, A. Shmizu, B. Tatarov, A. Kamei, C. H. Lee, I. Uno, T. Takemura, D. L. Westphal, , Long-Range transported saharan dust to east Asia observed with lidars, Scientific Online Letters on the Atmosphere, 10.2151/sola.2005-032, 1, 121-124, 1, 121-124, doi:10.2151/ sola.2005-032, 2005.01.
91. Meigen Zhang, Itsushi Uno, Yasuhiro Yoshida, Yongfu Xu, Zifa Wang, Hajime Akimoto, Timothy Bates, Trish Quinn, Alan Bandy, Byron Blomquist, Transport and transformation of sulfur compounds over East Asia during the TRACE-P and ACE-Asia campaigns, Atmospheric Environment, 10.1016/j.atmosenv.2004.02.073, 38, 40, 6947-6959, Vol.38, 6947-6959, 2004.12.
92. Itsushi Uno, Shinsuke Satake, Gregory R. Carmichael, Youhua Tang, Zifa Wang, Toshihiko Takemura, Nobuo Sugimoto, Atsushi Shimizu, Toshiyuki Murayama, Thomas A. Cahill, Steven Cliff, Mitsuo Uematsu, Sachio Ohta, Patricia K. Quinn, and Timothy S. Bates, Numerical study of Asian dust transport during the springtime of 2001 simulated with the Chemical Weather Forecasting System (CFORS) model, Journal of Geophysical Research, 10.1029/2003JD004222, 109, D19, Vol. 109, D19S24, doi:10.1029/2003JD004222, 2004.09.
93. Bin Zhu, Hajime Akimoto, Zifa Wang, Kengo Sudo, Jie Tang and Itsushi Uno, Why does surface ozone peak in summertime at Waliguan?, Geophysical Research Letters, 10.1029/2004GL020609, 31, 17, Vol. 31, L17104, doi: 10.1029/2004GL020609, 2004.09.
94. Tang Y., Gregory R. Carmichael, Gakuji Kurata, Itsushi Uno, Rodney J. Weber, Chul-Han Song, Sarath K. Guttikunda, Jung-Hun Woo, David G. Streets, Cao Wei, Antony D. Clarke, Barry Huebert, and Theodore L. Anderson, Impacts of dust on regional tropospheric chemistry during the ACE-Asia experiment: A model study with observations, J. Geophys. Res., 10.1029/2003JD003806, 109, D19, Vol.109, D19S21, doi:10.1029/2003JD003806, 2004.08.
95. Shimizu A., N. Sugimoto, I. Matsui, K. Arao, I. Uno, T. Murayama, N. Kagawa, K. Aoki, A. Uchiyama, A. Yamazaki, Continuous observations of Asian dust and other aerosols by polarization lidars in China and Japan during ACE-Asia, J. Geophys. Res., 10.1029/2002JD003253, 109, D19, Vol.109, D19S17, doi:10.1029/2002JD003253, 2004.08.
96. Youhua Tang, Gregory R. Carmichael, Larry W. Horowitz, Itsushi Uno, Jung-Hun Woo, David G. Streets, Donald Dabdub, Gakuji Kurata, Adrian Sandu, James Allan, Elliot Atlas, Franck Flocke, Lewis Gregory Huey, Roger O. Jakoubek, Dylan B. Millet, Patricia K. Q, Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U. S. West Coast during spring 2002, Journal of Geophysical Research, 10.1029/2004JD004513, 109, D23, Vol. 109, D23S11, doi:10.1029/2004JD004513, 2004.07.
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