冬春季东亚气溶胶流出通量年际变率的相关环流异常分析  

Interannual Variation of East Asian Aerosols Outflow in the Winter–Spring and Associated Atmospheric Circulation

作　　者：冯琎[1] 廖宏[2] 

机构地区：[1]中国科学院大气物理研究所大气边界层和大气化学国家重点实验室(LAPC),北京100029 [2]南京信息工程大学环境科学与工程学院,南京210044

出　　处：《大气科学》2017年第2期251-262,共12页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展计划(973计划)项目2014CB441200~~

摘　　要：本文使用戈达德对地观测系统(Goddard Earth Observing System,GEOS)全球三维大气化学传输模式GEOS-Chem模拟了气象场驱动下1986~2006年冬春季东亚到太平洋区域气溶胶的流出通量,分析了流出通量的年际变率及其相关的环流异常。结果表明,偏多(少)的东亚气溶胶流出对应东北亚—西太平洋区域(Northeast Asia–western Pacific,NAWP)500 h Pa定常波负值中心强度变强(弱)。NAWP区域500 h Pa位势高度场负(正)异常还可能造成气溶胶流出路径的变化,即更多(少)的气溶胶相对于气候态偏北5~10个纬度的路径向太平洋区域传输。这种位势高度场上的异常伴随着对流层中低层西风和大气斜压性异常,从而引起东亚到太平洋区域气溶胶流出通量及其路径的年际变化。The interannual variation（IAV） in aerosols mass outflow from East Asia to Pacific driven by meteorological fields in the winter-spring time and the associated atmosphere circulations are explored by the global three-dimensional Goddard Earth Observing System（GEOS） chemical transport model（GEOS-Chem） over 1986–2006.More（less） East Asian aerosols outflow to the downstream North Pacific region is concurrent with the enhanced（depressed） stationary wave center over Northeast Asia/western Pacific region（NAWP） at 500 h Pa.More East Asian aerosols mass tends to be transported downstream through a path 5–10 degrees north of the climatological path in the years with negative geopotential height anomalies over NAWP.The anomalies of the geopotential height at 500 h Pa over NAWP regions are accompanied by anomalies of westerly winds and baroclinicity in the lower troposphere,which induce the IAV of the fluxand the path of the East Asian aerosols outflow.

关 键 词：冬春季 东亚 气溶胶流出 年际变率 大气环流 

分 类 号：P402[天文地球—大气物理学与大气环境]