基于MODIS数据气溶胶光学厚度特征分析

Analysis of Aerosol Optical Thickness Characteristics Based on MODIS Data

气溶胶光学厚度(AOD)是表征大气浑浊程度的关键的物理量,也是确定气溶胶气候效应的重要因素。本文以环渤海区域为例,首先利用太阳光度计观测数据对MODIS数据气溶胶光学厚度产品进行验证分析,暗像元法反演结果最好;然后基于2005年1月至2019年2月MODIS暗像元法反演结果分析环渤海地区气溶胶光学厚度的时空分布。结果表明:环渤海地区AOD分布呈现出明显的季节变化,春夏季节气溶胶处于高值区(0.7-0.9),秋冬季节处于低值区(0.2-0.5),AOD高值区主要分布于北京、天津及河北和山东交界地区。气溶胶分布特征可能与沙尘天气、季风变化和工业生产生活的污染物排放有关。

Aerosol optical thickness(AOD)is the key physical quantity of turbidity in the atmosphere and the important factor in determining the climatic effects of aerosols.Taking the Bohai Rim region as study area,this paper uses the solar photometer observation data to verify and analyze the MODIS data aerosol optical thickness products,demonstrating the better performance of dark pixel method inversion.Then based on the inversion results of MODIS dark pixel method from January 2005 to February 2019,the temporal and spatial distribution of AOD is analyzed in the Bohai Sea.The results show that the AOD distribution has obvious seasonal variations.The aerosol reaches the high value(0.7-0.9)in the spring and summer,and low value(0.2-0.5)in the autumn and winter season.The AOD high value area is mainly distributed in Beijing,Tianjin and the border area between Hebei Province and Shandong Province.The distribution characteristics of aerosols may be related to dust weather,monsoon,and pollutant emissions from industrial production.