Correlation Analysis between PM2.5 Concentration and Meteorological Factors in Beijing Area

ZHOU Yimin, ZHAO Xinyi†

Laboratory for Earth Surface Processes ( MOE), College of Urban and Environmental Science, Peking University, Beijing 100871; † Corresponding author, E- mail: sh-zhao@urban.pku.edu.cn

Abstract The concentration monitoring of the Embassy of the United States in China since 2009, the aerosol optical depth of MODIS and the planetary boundary layer data of NCEP were used to analyze the meteorological conditions in the planetary boundary layer of Beijing in recent years. The results show that from 2009 to the summer of 2011 and the summer and winter of 2012, the pollution status of Beijing is serious. In 2013 and 2014, 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 south wind, the better the accumulation effect. Higher planetary boundary layer results in better diffusion. Greater humidity results in more accumulation. Precipitation has obvious effect on the diffusion of pollutant. Since twentyfirst century, these meteorological conditions of Beijing have no obvious interannual variation except the planetary boundary layer height, which is obviously reduced from 2500 m to 1500 m. Key words Beijing; PM2.5; the meteorological conditions in planetary boundary layer

中国近 30 年来经济高速发展, 导致大量的能源消耗和大气污染物排放。地面观测资料已经证实[1–6]地面水平能见度降低以及接受到的太阳辐射减少 。其中, 京津冀地区霾的情况尤为严重[ 7– 13], 并引起

广泛关注。

霾形成的原因主要是大气中的气溶胶。大气气溶胶是悬浮在大气中的固态和液态颗粒物的总称。京津冀地区的大气气溶胶微粒主要来源于工业活