基于地基遥感数据的太湖地区气溶胶光学厚度和粒子谱变化规律研究  

Characteristics of aerosol optical depth and aerosol particle size distribution based on ground-based remote sensing in the Taihu Region

作　　者：郑有飞[1,2] 范进进[1,2] 刘建军 姜杰[2] 

机构地区：[1]江苏省气象灾害重点实验室,南京210044 [2]南京信息工程大学,大气物理学院,南京210044 [3]马里兰大学地球系统科学多学科研究中心,马里兰20740

出　　处：《环境科学学报》2013年第6期1672-1681,共10页Acta Scientiae Circumstantiae

基　　金：江苏省高校自然科学研究重大项目(No.09KJA170004);国家自然科学基金面上项目(No.41075114);国家重点基础研究发展计划项目第五课题(No.2006CB403705)~~

摘　　要：利用多光谱旋转遮蔽影带辐射计(Multi-Filter Rotating Shadowband Radiometer,MFRSR)测定了我国长江三角洲中部的太湖地区2008年5月至2009年4月期间415nm、500nm、615nm、673nm、870nm波段的全天空总辐射、散射辐射和直接辐射通量密度,结合球形粒子的Mie散射理论反演了该地区大气气溶胶粒子谱,并对结果进行了分析.结果表明:受人为活动的影响,该地区工作日和非工作日气溶胶光学厚度和粒子谱的日变化存在明显的差异,工作日上午6:00-9:00时间内,细粒子的生成远大于非工作日这一期间细粒子的生成.太湖地区气溶胶光学厚度常年较高,500nm波段的年平均值为0.8038±0.7924,夏季最大(0.9359±0.7389),冬季最小(0.6209±0.5500);气溶胶粒子谱表现出双峰分布,一种是位于半径0.15μm附近的细模态,另一种是半径3μm左右的粗模态,且夏季和秋季细粒子较多,而其他季节粗粒子较多.气溶胶光学厚度以及气溶胶粒子谱分布的季节变化受到气象条件的显著影响.降水过程对大气气溶胶具有明显的冲刷作用,并且降水后大气气溶胶的增加与气溶胶粒子大小有关,积聚态粒子浓度的增加比粗模态粒子的增加更快.Direct,diffuse and net solar radiation was measured at a site in the Taihu region from May 2008 to April 2009 using a multi-filter rotating shadow band radiometer.Based on the Mie theory of spherical particles,the aerosol particle size distribution was retrieved and analyzed.Diurnal cycles of the aerosol optical depth（AOD） and the aerosol particle size distribution differed from weekdays to weekends due to human activities.More fine particles were generated from 06：00—09：00（local time） on weekdays than during the same period on weekends.The annually averaged AOD at 500 nm was 0.8038±0.7924 with a maximum value of 0.9359±0.7389 in the summer and a minimum value of 0.6209±0.5500 in the winter.The aerosol particle size distribution was bimodal with a fine-mode peak at 0.15 μm and a coarse-mode peak at 3 μm.Fine-mode particles dominated over the area in the summer and autumn,while coarse-mode particles dominated over in winter.Variations in AOD and aerosol particle size distribution were significantly influenced by weather patterns.Aerosol loading was greatly diminished by precipitation washout and the subsequent build-up in aerosol loading depended on the aerosol size.The rate of increase of submicron aerosol particles was greater than that of coarse-mode aerosols.

关 键 词：多光谱旋转遮蔽影带辐射计 气溶胶光学厚度 气溶胶粒子谱 

分 类 号：X87[环境科学与工程—环境工程] X513