欧亚大陆生物质燃烧气团的输送特征及对中国的影响

 利用1997～2003年ATSR卫星火点资料,采用前向气流轨迹模式及滞留时间分析方法,研究了欧亚大陆生物质燃烧排放的时空分布特征及主要生物质燃烧区域典型排放季节低层气团的输送特征,并与MOPITT一氧化碳卫星反演资料进行对比.结果表明,春季东南亚及印度半岛生物质燃烧排放的污染气团可对中国西南、华南及华东地区的大气环境造成一定影响,尤其是四川盆地、福建和台湾周边地区;中亚、东西伯利亚及蒙古高原生物质燃烧排放的污染气团主要受西风带影响而向东输送,但明显存在一条分支经中国东北向华北或更低纬度地区输送,并逐渐下沉至大气低层,在生物质燃烧排放剧烈的年份内能够对该地区的低层大气成分造成重要影响.

Transport pattern of biomass burnings air masses in Eurasia and the impacts on China

Based on the fire counts from ATSR satellite in the year 1997~2003,forward trajectories and residence time analysis,the spatial and temporal distributions of biomass burning activities in Eurasia and the transport character of low tropospheric air over major biomass burning regions during the seasons of strong emission were studied.The trajectory results were validated by MOPITT retrieved CO data.The biomass burning impacted air masses originated from southeastern Asia and the Indian Peninsula in spring might form definite influence on air quality over the southwestern,southern,and eastern regiones of China,especially over the Sichuan Basin,Fujian,and Taiwan.The biomass burning plumes over central Asia,east Siberia and Mongolia were mainly transported toward east due to the westerlies,but also existed an apparent transport path toward the North China Plains and lower latitude regions via northeastern China,during which the air masses subsided,and could had significant impact on the atmospheric composition over these regions in years with intense biomass burning.