DISTRIBUTION ANALYSIS ON ANTHROPOGENIC AEROSOLS IN EAST ASIA BY STATELLITE DATA

1.在这项研究中，我们发展了三种新的方法来反演气溶胶的S光学参数，即折射率N_r的实部、500 nm处的光学厚度τ_a和阿格斯特罗姆指数a。它们是单波段R-P(反射-偏振)法、双波段R-R(反射-反射-偏振)法和双波段P-P(偏振-偏振)法。我们发现，在三种方法中，单波段R-P方法给出了我们验证站点的气溶胶光学参数值与实测值之间最好的一致性。应用R-P方法绘制了日本海和西太平洋N_r、τ_a)和α的分布图。本研究首次绘制了Nr的分布图。通过绘制从POLDER数据集中提取的气溶胶三个光学参数的每日、每周和每月分布图，阐明了1997年4月期间整个亚洲海域的气溶胶运动情况。我们在4月份发现了大量人为气溶胶从中国流向日本，其Nr=1.4-1.50，a=1.0-1.5。在香港和印度大陆西海岸附近也发现了类似的气溶胶流动。

1. In this study we have developed three new methods for retrieving aerosol' s optical parameters, namely, the real part of refractive index N_r, optical thickness at 500nm τ_a )500) and Angstrom exponent a from the POLDER data sets. They are a single band R-P (Reflectance-Polarization) method, a two band R-R (Reflectance-Reflectance) method and a two band P-P )Polarization -Polarization) method.2. We found that the single band R-P method among the three methods gives the best agreement between retrieved and measured aerosol optical parameter values at our validation site.3. The distribution maps of N_r, τ_a )500), and α , over the Japan Sea and western Pacific Ocean were presented by applying the R-P method to POLDER data. The distribution map of Nr was presented for the first time by this study.4. The movement of aerosols in whole Asian sea areas during April 1997 was clarified by making daily, weekly and monthly distribution maps of aerosol's three optical parameters which were retrieved from the POLDER data sets. We found significant flows of anthropogenic aerosols with Nr=1.40-1.50 and a =1.0-1.5 from China to Japan in April. Similar aerosol flows were found near Hong Kong and the western coast of Indian Continent.