京津冀地区气溶胶光学厚度时空分布特征分析

Temporal and Spatial Distribution of Aerosol Optical Depth in Beijing-Tianjin-Hebei Region

基于Himawari-8三级小时气溶胶光学厚度(Aerosol Optical Depth,AOD)产品,结合Matlab和ArcGIS软件对AOD数据进行预处理,通过小时AOD数据合成月、季和年尺度AOD数据,并从月、季和年尺度分析京津冀地区2015年12月—2018年2月AOD的时空分布特征。研究结果表明,从空间分布上看,年、季和月空间分布情况总体一致,AOD整体表现为从北到南逐渐增大的趋势。从时间变化上看,AOD年均值在天津市最大,承德市最小;各市AOD季节变化总体表现一致,夏季最大,冬季最小。AOD在年内变化幅度较大,整体表现为上升趋势,各市年内变化特征与京津冀地区整体变化特征基本一致。

The level 3 aerosol optical thickness(AOD)product of the Sunflower-8 geostationary meteorological satellite(Himawari-8)is combined with MATLAB and ArcGIS software to preprocess the AOD data,and the hourly AOD data is synthesized into the monthly,seasonal and annual scale AOD data.Then the temporal and spatial variation characteristics of AOD are analyzed from December 2015 to February 2018 in Beijing-Tianjin-Hebei region at monthly,seasonal and annual scales.The results show that,from the perspective of spatial distribution,the AOD at monthly,seasonal and annual scales gradually increases from north to south and has the same changing trend in the Beijing-Tianjin-Hebei region.In terms of time change,the annual average AOD is the largest in Tianjin and the smallest in Chengde.The seasonal AOD has the same variation characteristics in major cities,with the largest in summer and the smallest in winter.AOD changes a lot within the year,and shows an upward trend.The changing characteristics of major cities are basically consistent with the overall changes in the Beijing-Tianjin-Hebei region.