生物质燃烧对中国东北地区CO浓度的影响研究

利用Aqua卫星上AIRS传感器的近地表和500hPa气压层高度的CO数据,研究了中国东北地区2012年CO时空分布特征及其变化趋势,并结合MODIS火点资料以及NCEP/NCAR的风场资料,分析了当地的生物质燃烧以及周边国家和地区CO远距离输送对研究区CO浓度的影响。研究结果表明:近地表CO浓度高值出现在冬季和春季,低值出现在夏季和秋季,2011~2013年连续3a的CO浓度与火点数的相关关系均在0.52左右,显著相关。此外,CO的分布还与当地的供暖时间、人口密度和工业分布有关:CO的高值时间与中国东北地区冬季供暖时间基本一致,人口和工业集中地区的CO浓度偏高,人口稀少的内蒙古草原CO浓度值偏低;根据NECP/NCAR的风场资料,中国东北地区500hPa气压层高度全年受来自西伯利亚和蒙古国的西北风影响,东北地区,尤其是内蒙古自治区,西伯利亚和蒙古国常年有大量火点,在500hPa气压层高度的CO浓度受西伯利亚和蒙古国的影响。生物质燃烧能够反映农作物收获时间,CO浓度的时空变化规律也能在一定程度上反映我国农作物的时空分布特征,具有重要的研究意义。

The Study of the Effects on Carbon Monoxide in Northeast China from Biomass Burning

With carbon monoxide data on surface and 500 hPa pressure surface in 2012 from Atmospheric Infrared Sounder(AIRS) observation,the spatial and temporal distribution of carbon monoxide in northeast China was investigated.The effects of domestic biomass burning and carbon monoxide advection from surrounding countries and regions on carbon monoxide in northeast of China were analyzed with fire data of MODIS integrated from Terra and Aqua and meteorological data from NCEP/NCAR. Results showed that carbon monoxide volume mixing ratio at surface was heavy during winter and spring,and was light in summer and autumn due to domestic Warm Supply,the seasonal differences of OH free radicals concentration,population density and industrial distribution.Carbon monoxide volume mixing ratio was heavy in the regions with high population density and industrial concentration district and vice versa.Meteorological data from NCEP/NCAR showed that there existed a transport path from Siberia and Mongolia towards northeast of China during most of months.Biomass burning could reflect the harvest time of crops and therefore the spatial and temporal distribution of crops could be reflected by the distribution of carbon monoxide.In this paper,we studied the effects from biomass burning on carbon monoxide concentration in northeast of China,which would be of great significance for environmental management.