Seasonal and monthly variations of columnar aerosol optical properties over east Asia determined from multi-year MODIS,LIDAR, and AERONET Sun/sky radiometer measurements |
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| Affiliation: | 1. Département de géographie, Université Laval, Quebec City, Quebec, Canada;2. Department of Geosciences, Tel Aviv University, Tel Aviv, Israel;3. Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD, USA;1. Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA;2. Earth Sciences Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA;3. Joint Center for Earth Science and Technology, University of Maryland at Baltimore County, Baltimore, MD, USA;4. Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA;5. NASA Langley Research Center, Hampton, VA, USA;6. Universities Space Research Association, Columbia, MD, USA;7. Department of Physics, University of Maryland at Baltimore County, Baltimore, MD, USA;1. State Environmental Protection Key Laboratory of Satellite Remote Sensing, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique, F-59000 Lille, France;4. GRASP-SAS, Remote Sensing Developments, Université de Lille, Villeneuve D'' ASCQ, 59655, France;5. Chengdu University of Information and Technology, China |
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| Abstract: | Multi-year records of MODIS, micro-pulse lidar (MPL), and aerosol robotic network (AERONET) Sun/sky radiometer measurements were analyzed to investigate the seasonal, monthly and geographical variations of columnar aerosol optical properties over east Asia. Similar features of monthly and seasonal variations were found among the measurements, though the observational methodology and periods are not coincident. Seasonal and monthly cycles of MODIS-derived aerosol optical depth (AOD) over east Asia showed a maximum in spring and a minimum in autumn and winter. Aerosol vertical extinction profiles measured by MPL also showed elevated aerosol loads in the middle troposphere during the spring season. Seasonal and spatial distributions were related to the dust and anthropogenic emissions in spring, but modified by precipitation in July–August and regional atmospheric dispersion in September–February. All of the AERONET Sun/sky radiometers utilized in this study showed the same seasonal and monthly variations of MODIS-derived AOD. Interestingly, we found a peak of monthly mean AOD over industrialized coastal regions of China and the Yellow Sea, the Korean Peninsula, and Japan, in June from both MODIS and AERONET Sun/sky radiometer measurements. Especially, the maximum monthly mean AOD in June is more evident at the AERONET urban sites (Beijing and Gwangju). This AOD June maximum is attributable to the relative contribution of various processes such as stagnant synoptic meteorological patterns, secondary aerosol formation, hygroscopic growth of hydrophilic aerosols due to enhanced relative humidity, and smoke aerosols by regional biomass burning. |
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