摘要
利用美国驻中国大使馆2009年以来的PM_(2.5)浓度监测数据、MODIS光学厚度数据和NCEP边界层气象要素数据,对近年来北京地区PM_(2.5)和边界层内气象要素进行分析。结果表明:2009—2011年夏、秋季以及2012年夏、冬季北京地区PM_(2.5)污染情况较为严重,2013和2014年污染情况稍有转好;北风为有利于PM_(2.5)扩散的气象条件,且随着北风增强,扩散效果更好;南风为有利于PM_(2.5)堆积的气象条件,且随着南风增大,堆积效果略微增加;边界层高度越高,越有利于PM_(2.5)的扩散;相对湿度越大,越有利于PM_(2.5)的堆积;降水对PM_(2.5)有明显的驱散作用。21世纪以来,北京地区的平均边界层高度有明显的降低趋势,从2500 m降低到1500 m以下,其他气象要素没有明显的年际变化。
The concentration monitoring of the Embassy of the United States in China since2009,the aerosoloptical depth of MODIS and the planetary boundary layer data of NCEP were used to analyze the meteorologicalconditions in the planetary boundary layer of Beijing in recent years.The results show that from2009to thesummer of2011and the summer and winter of2012,the pollution status of Beijing is serious.In2013and2014,pollution is slightly better.The north wind is benefit to the diffusion of pollutants,and the greater the north wind,the better the diffusion effect.The south wind is benefit to the accumulation of pollutants,and the greater the southwind,the better the accumulation effect.Higher planetary boundary layer results in better diffusion.Greaterhumidity results in more accumulation.Precipitation has obvious effect on the diffusion of pollutant.Since twentyfirstcentury,these meteorological conditions of Beijing have no obvious interannual variation except the planetaryboundary layer height,which is obviously reduced from2500m to1500m.
作者
周一敏
赵昕奕
ZHOU Yimin;ZHAO Xinyi(Laboratory for Earth Surface Processes (MOE), College of Urban and Environmental Science, Peking University, Beijing 100871)
出处
《北京大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第1期111-124,共14页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金(41471073)资助
关键词
北京
PM2.5
边界层内气象要素
Beijing
PM2.5
the meteorological conditions in planetary boundary layer
