河南省2005~2015 年NO2和PM2.5时空变化遥感解析

Remote sensing analysis of spatio-temporal variation of NO_2 and PM_(2.5) during 2005 throughout 2015 over Henan Province

利用MODIS气溶胶光学厚度(AOD)估算的近地面PM_(2.5)质量浓度和OMI对流层NO_2垂直柱浓度数据,统计分析了近11a(2005~2015年)河南省PM_(2.5)质量浓度和NO_2垂直柱浓度的空间分布、长时间序列变化和季节变化特征.研究发现:河南省中北部为PM_(2.5)和NO_2高值区,西部和南部山区为低值区.PM_(2.5)和NO_2最高值出现在冬季,其中2013年冬季达到峰值,分别为155.7μg/m^3和2279.45×10^(13)mole/cm^2;最低值则通常出现在夏季,其中2015年夏季达到最低值,分别为49.17μg/m3和427.37×10^(13)mole/cm^2.2011年之后河南省年均PM_(2.5)和NO_2逐年下降,2015年达到2005年以来的最低值,分别为65.7μg/m^3和765.14×10^(13)mole/cm^2.

We applied the aerosol optical depth(AOD)retrieved from the MODIS satellites and the tropospheric NO2 columns retrieved from the OMI satellite for studying the spatial and temporal distributions of air pollution in Henan Province.The results indicated that high PM2.5and NO2concentrations were mainly found in the central and the north areas of Henan province.The seasonal average concentrations of PM2.5and NO2were both found to be highest in winter and be lowest in summer.Particularly,the maximum PM2.5and NO2concentrations arrived155.7μg/m3and2279.45×1013 mole/cm2respectively in the winter of2013,while the minimum PM2.5and NO2concentrations were as low as49.17μg/m3and427.37×1013mole/cm2respectively in the summer of2015.The annual average concentrations of ground-level PM2.5and NO2over Henan province increased from2005to2011,and then decreased from2011to2015.The annual average concentrations of ground-level PM2.5and NO2had been dropped to65.7μg/m3and765.14×1013mole/cm2in the year of2015.