DISTRIBUTION ANALYSIS ON ANTHROPOGENIC AEROSOLS IN EAST ASIA BY STATELLITE DATA

1.本文发展了三种新的反演气溶胶光学参数的方法，即从POLDER资料反演气溶胶折射率N_r的真实的部分、500 nm处的光学厚度τ_a（500）和Angstrom指数a。它们分别是单波段反射-偏振（R-P）法、双波段反射-反射（R-R）法和双波段偏振-偏振（P-P）法.结果表明，单波段R-P方法反演的气溶胶光学参数与实测值的一致性最好.利用POLDER资料，用R-P方法计算了日本海和西太平洋的N_r、τ_a（500）和α_i的分布图。本研究首次绘制了Nr的分布图.利用POLDER资料反演了气溶胶的三个光学参数，并制作了日、周、月分布图，阐明了1997年4月整个亚洲海域气溶胶的运动情况。我们发现，在4月从中国到日本的人为气溶胶流Nr=1.40-1.50和a =1.0-1.5的显着。在香港附近和印度大陆西海岸也发现了类似的气溶胶流。

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.