2000—2013年北京及周边地区大气气溶胶光学厚度时空变化特征及气象影响因素分析  

Spatia-temporal variation of atmospheric aerosol optical depth and the meteorological factors in Beijing and surrounding area from 2000 to 2013

作　　者：俞海洋 张杰[1] 李婷 魏军 赵亮 YU Haiyang;ZHANG Jie;LI Ting;WEI Jun;ZHAO Liang(Key Laboratory of Meteorological Disaster,Ministry of Education/ Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Nanjing University of Information Science ＆ Technology,Nanjing 210044,China;Hebei Meteorological Disaster Prevention Center,Shijiazhuang 050021,China)

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室/气象灾害预报预警与评估协同创新中心,南京210044 [2]河北省气象灾害防御中心,石家庄050021

出　　处：《气象科学》2018年第4期512-522,共11页Journal of the Meteorological Sciences

基　　金：河北省气象事业发展"十二五规划";河北省农村气象灾害防御与农业气象服务工程(2016023889)

摘　　要：利用NASA Terra卫星搭载的MODIS传感器观测到的2000—2013年气溶胶光学厚度数据和河北省142个观测站同期的气象数据,对北京及周边区域大气气溶胶的时空变化特征进行了分析,并通过研究光学厚度与各气象要素的关系,对影响大气气溶胶时空变化的关键气象因素进行探讨。结果表明:北京以南区域的气溶胶光学厚度在夏季最大,其次为春季,秋冬季相对较低,河北省西北部低于东南部;坝上地区的光学厚度年际变化小于其他地区,平原区与沿海地区的年际变化基本一致,春夏高于秋冬。春季相对湿度是影响光学厚度值的重要因素,气溶胶光学厚度的高值出现在5—7月,并伴随较高的相对湿度、较低的能见度、南风、较低的地面风速和稳定的大气层结。北京以南的河北省各台站污染程度与北京类似,南部站点的光学厚度高于东北部,这与人为气溶胶的排放主要集中于北京南部的工业城市,以及南风控制的污染物扩散方向有关。This study analyzed the spatio-temporal variation of atmospheric Aerosol Optical Depth（ AOD） in Beijing and surrounding areas from 2000 to 2013 by utilizing the AOD data from the Moderateresolution Imaging Spectroradiometer（ MODIS） aboard NASA Terra satellite and the in-situ observations of meteorological parameters from 142 weather stations in Hebei Province, and discussed the key meteorological factors that affect the spatio-temporal variation of atmospheric aerosol through studying the relationship between AOD and various meteorological parameters. The results show that the AOD in the southern area of Beijing reaches the maximum in summer,followed by spring,while the AOD in autumn and winter is relatively low. The AOD in the northwest of Hebei is lower than that in the southeast. The interannual variation of AOD in the dam area is significantly lower than that of other regions,while theinterannual variation of AOD in the plain area is similar to that in the coastal area,with higher AOD in spring and summer than autumn and winter. In spring,the relative humidity plays an important role in affecting AOD,and the peak values of AOD range from May to July,accompanied with higher relative humidity,lower visibility,southerly wind,lower surface wind speed and stable atmospheric stratification.,the degree of contamination of stations in Hebei province to the south of Beijing is similar to that in Beijing,and the AOD observed in the southern stations is higher than that in the northeastern stations. This may be due to the fact that the anthropogenic aerosol emissions are mainly concentrated in the industrialized cities to the south of Beijing,and the diffusion direction of pollutant controlled by the southerly wind.

关 键 词：大气气溶胶 MODIS 风速 相对湿度 光学厚度 

分 类 号：P421.1[天文地球—大气科学及气象学]