华北地区秸秆禁烧前后的NO2卫星遥感监测分析

为保证奥运会期间的空气质量,2008年5~9月在华北平原地区采取了秸秆禁烧措施.采取遥感监测手段,利用MODIS数据的中红外和热红外通道数据监测禁烧前后的2年(2007、2008)同一时期禁烧区域的秸秆焚烧点分布情况,并利用OMI数据计算出该区域相应时期的对流层NO2垂直柱浓度总量变化情况.通过禁烧前后的数据统计分析, 6、7月秸秆焚烧点由2007年的每天近250个减少到2008年的每天约40个,秸秆禁烧对对流层NO2柱浓度的降低起到一定的作用,但不明显.分析了利用遥感监测秸秆焚烧点和NO2浓度的不确定性.

Analysis of crop residue burning and tropospheric NO2 vertical column density retrieved from satellite remote sensing in North China

To insure air quality during the Beijing Olympic Games, open field burning of crop residues was banned in North China from May to September in 2008. The impact of this effort was estimated through the detection of the crop residue burning from MODIS data and measurement of NO2 vertical column density retrieved from OMI data. The middle and thermal infrared channels of MODIS data were used to monitor the crop residue burning from June to August in 2007 and 2008. The number of crop residue burning pixels obviously decreased from about 250d in 2007 to less than 40d in 2008 in June and July, but there was a little increase in August. Meanwhile, the monthly averaged tropospheric NO2 vertical column density retrieved from OMI data from June to August in 2007 and 2008 were used to study the difference of the variation of NO2 in these two years, and the results indicated that NO2 concentration had been reduced due to the ban of crop residue burning to some extent, but the impact of this effort was limited.