摘要
为深入研究长三角地区气溶胶对辐射和降水的影响,本文分析了2004—2014年该区气溶胶光学厚度(aerosol optical depth,AOD)、辐射和降水的时空变化特征,在季节尺度确定了对辐射和降水影响最大的气溶胶成分.研究发现:2004—2008年,AOD在春、夏季明显上升(0.260·(10a)^(-1)、0.066·(10a)^(-1)),辐射在春季明显上升(20.4 W·m-2·(10a)^(-1)))、夏季明显下降(-41.4W·m-2·(10a)^(-1))),降水在夏季明显上升(4.6mm·(10a)^(-1))、冬季明显下降(^(-1).7mm·(10a)^(-1));2009—2014年秋季AOD明显下降(-0.126·(10a)^(-1)),辐射和降水无明显变化趋势.2004—2014年辐射在春、夏季受云量和气溶胶共同影响,2004—2008年秋、冬季辐射主要受AOD影响,2009—2014年秋、冬季辐射与云量相关性更高.各季节沙尘、海盐气溶胶的AOD小于总AOD的20%,但其对辐射和降水影响更大.春、夏季对辐射影响最大的气溶胶分别是细模态沙尘和细模态海盐;降水在春、夏、冬季均受沙尘气溶胶影响最大.
This work aimed to study effects of aerosols on radiation and precipitation in the Yangtze River Delta.Temporal and spatial variations of aerosol optical depth(AOD),radiation and precipitation from 2004-2014 were analyzed,aerosol composition with greatest impact on radiation and precipitation was determined.From 2004-2008,AOD was found to increase significantly in spring and summer(0.260·(10 a)-1、0.066·(10 a)-1),radiation increased significantly in spring(20.4 W·m-2·(10 a)-1)and decreased significantly in summer(-41.4 W·m-2·(10 a)-1)).Total precipitation increased significantly(4.6 mm·(10 a)-1)in summer and decreased significantly(-1.7 mm·(10 a)-1)in winter.AOD decreased significantly(-0.126·(10 a)-1)in autumn in 2009-2014.Radiation was affected by cloud cover and aerosols in spring and summer,in autumn and winter of 2004-2008 it was mainly affected by AOD,while in autumn and winter of 2009-2014 it was more correlated with cloud cover.AOD of dust and seasalt aerosols accounted for less than 20%of the total in each season,but with much greater impact on radiation and precipitation.Aerosols with greatest impact on radiation in spring and summer were found to be dust PM2.5 and seasalt PM2.5.Precipitation was most affected by dust aerosols in spring,summer and winter.
作者
陆天蔚
张晶
乔岩
薛文晧
周丽花
LU Tianwei;ZHANG Jing;QIAO Yan;XUE Wenhao;ZHOU Lihua(College of Global Change and Earth System Science,Beijing Normal University,100875,Beijing,China)
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第1期135-144,共10页
Journal of Beijing Normal University(Natural Science)
基金
国家自然科学基金资助项目(41575144)
国家重点研发计划资助项目(2017YFA0603603)
关键词
AOD
云
辐射
降水
AOD(aerosol optical depth)
cloud
radiation
precipitation
