华东农田秸秆燃烧对常州大气环境的影响

为研究2012年6月6—15日华东农田秸秆燃烧对江苏省常州市大气环境的可能影响,利用中分辨率成像光谱仪(MODIS)火点探测数据、气溶胶光学厚度(AOD)数据、臭氧监测仪(OMI)的二氧化氮(NO2)柱含量密度、大气红外探空仪(AIRS)的一氧化碳(CO)柱含量密度和地面监测的PM_(2.5)、NO_2、CO浓度等数据,结合天气形势和后向轨迹分析的方法进行了系统的分析。监测数据表明:华东地区2012年6月火点数目分别在9日和13日出现高值,分别达到1714和1654个;AOD、NO_2柱含量密度、CO柱含量密度与火点的变化趋势大致相同。利用HYSPLIT前向轨迹模式和火点分布可知:到达常州的高低空气流均经过火点源区时,地面和大气柱污染物浓度发生显著的协同变化;而当到达常州的高低空气流传输轨迹不同时,地面和大气柱污染物浓度变化趋势不一致。本次常州地区污染事件主要是由山西、河北、河南、山东、安徽、江苏北部的秸秆燃烧排放的大气污染物经大气高空传输扩散所致。

Impact of Crop Residue Burning in Eastern China on Atmospheric Environment of Changzhou

In order to study the impact of the crop residue burning in the farmland of eastern China from June 6 to 15,2012 on the atmospheric environment of Changzhou,Jiangsu province,we used the fire point detection data of moderate resolution imaging spectroradiometer (MODIS),aerosol optical depth (AOD),the content of nitrogen dioxide (NO2) column density detected by ozone monitor (OMI),the content of carbon monoxide (CO) column density detected by atmospheric infrared sonde (AIRS) and the PM2.5,NO2 and CO concentration obtained from ground monitoring,combined with the weather situation and backward trajectory analysis made a systematic analysis.The results show that: the fire point number on June 2012 in eastern China reached the peak in June 9 and 13 while the number of fire point reached 1714 and 1654 respectively,and the trend of AOD,NO2 column density,CO column density were roughly the same.The ground monitoring data will have an obvious synergy variation with the column density of gaseous pollutants when the high and low flow arrived Changzhou all pass the source areas of fire points.But there will be different between the ground monitoring data and gaseous pollutants column density when the high and low flow trajectory are different.The Changzhou pollution incidents are mainly due to the crop residue burning in Shanxi,Hebei,Henan,Shandong,Anhui and northern Jiangsu,while the air pollution components diffuse through the atmosphere transportation at high altitude.