2004年北京地区秋季大气气溶胶粒子分布特征  

Characterizations of Aerosol Distribution over Beijing Region in Autumn 2004

作　　者：马新成[1] 田伟红 张磊[1] 张蔷[1] 

机构地区：[1]北京市人工影响天气办公室,北京100089 [2]国家气象中心,北京100081

出　　处：《气象科技》2011年第6期685-691,共7页Meteorological Science and Technology

基　　金：北京市优秀人才培养项目(20081D0200800058;20071D020800058);国家重点基础研究发展计划项目(2011CB403401);华北地区大气水循环及空中水资源的潜势研究(GYHY200906025)共同资助

摘　　要：2004年秋季在北京地区利用机载大气气溶胶粒子探头进行了大气气溶胶观测,获得了0～7km气溶胶细粒子数浓度和尺度谱分布的垂直、水平变化特征。结果表明:北京地区上空气溶胶粒子数浓度在1km左右高度以下的混合层内有均匀的分布,明显递减层的高度范围约在1～2km之间,2km以上随高度递减很小,高层气溶胶数浓度变化不大,小于200个/cm3;当有逆温存在时,常在其下边界附近形成气溶胶的"累积层";当处于高压控制下,晴天大风天气条件时,北京地区较干净,近地面气溶胶数浓度约在500～800个/cm3,而当处于弱低压控制时,晴天小风天气条件下,北京地区会出现较严重污染,近地面的气溶胶数浓度达到约为8000个/cm3,是较为干净情况下的10倍左右;粒子谱受不同形成机制影响,多为单峰分布。The finemode aerosol concentration and the size distributions from the ground to 7 km over Beijing in 2004 are analyzed, by means of the data within and above the planetary boundary layer from the optical spectrometer probes mounted on a light aircraft. The results show that aerosol particles over the Beijing area had a uniform distribution below the mixed layer, decreased with height significantly between 1 to 2 km, and decreased slowly with height above 2 km. At higher levels, the number concentration of aerosols was smaller than 200 cm^-3 with less variation. When there existed inversion, finemode aerosols often formed in the“accumulation layer”near the top of the boundary layer. Under highpressure conditions, the number concentration of aerosols near the ground was about 500 to 800 cm^-3; while in a weak lowpressure case, the number concentration of aerosols near the ground was about 8000/cm^3.The observed finemode aerosol size distributions show a singlepeaked mode.

关 键 词：大气气溶胶 飞机探测 北京 

分 类 号：X513[环境科学与工程—环境工程]