中国东部气溶胶光学厚度季节变化的数值模拟  

Numerical simulation of the seasonal variation of aerosol optical depth over eastern China

作　　者：李嘉伟[1] 韩志伟[1] 

机构地区：[1]中国科学院大气物理研究所东亚区域气候-环境重点实验室,北京100029

出　　处：《遥感学报》2016年第2期205-215,共11页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点基础研究计划(编号:2010CB950804;2014CB953703);国家自然科学基金(编号:41405140)~~

摘　　要：气候模式对气溶胶光学厚度AOD的合理模拟,是模拟研究气溶胶气候效应的前提。利用在线耦合的区域气候—大气化学—气溶胶耦合模式系统RIEMS-Chem,模拟研究了2010年中国东部地区AOD的季节变化情况。模拟结果与卫星搭载的中分辨率成像光谱仪(MODIS)的反演资料和地基气溶胶观测网(AERONET)的站点观测资料分别进行了一年四季的详细对比,检验结果显示尽管模拟值有所低估,模式仍然能够合理地反映AOD的季节变化情况和空间分布特征,与AERONET站点观测值相比,整体相关系数为0.6。MODIS反演和相应模拟结果均显示,中国东部地区AOD整体水平夏季最大,春季次之,秋、冬季最小,华北平原、四川盆地和华中地区是AOD的主要大值区。只考虑日间AOD时,其季节分布特征略有不同,在华北平原地区,日间AOD夏季最大(1.1—1.5),在长江中下游流域地区,日间AOD则在春季最大(1.1—1.7);在中国东部,日间AOD的大值在夏、冬两季分别主要分布在长江以北、以南地区,而在春、秋两季则主要位于长江中下游流域。Aerosol Optical Depth（AOD） is a key factor that reflects the impact of atmospheric aerosol on the climate. The accurate simulation of AOD is the basis for a climatic model in modeling the aerosol climate effects. In this study, an online-coupled three-dimensional regional climate–atmospheric chemistry–aerosol model was used to investigate the AOD over eastern China in 2010 to understand the spatial and seasonal behavior of AOD and the role aerosol plays over this region.The Regional Integrated Environmental Modeling System online-coupled with atmospheric chemistry and aerosol processes（RIEMS-Chem） was used in this study.This model contains sophisticated atmospheric dynamic, atmospheric chemical, and aerosol chemical processes. The onlinecoupled system facilitates the model to simulate the impact of aerosol on climatic factors and the feedback of climate on aerosol distribution.Simulated AOD was verified by satellite retrieval of the Moderate-Resolution Imaging Spectroradiometer（MODIS） and insitu measurements from the Aerosol Robotic Network（AERONET） in four seasons.The comparison of the AOD simulation result with the corresponding MODIS retrieval indicated the capability of the model to reproduce the seasonal variation and spatial distribution of AOD over eastern China, although the model somewhat underestimated the magnitude in summer.The comparison of AOD measurements from the six AERONET sites also showed that the model was able to simulate the spatial and seasonal variation of AOD, but underestimated the magnitude over north China, with an overall correlation coefficient of 0.6 compared with all AERONET measurements. The MODIS retrieval and corresponding simulation result showed that, over eastern China, the AOD was generally higher in summer,followed by spring, and lower in autumn and winter. However, the daytime seasonal mean AOD showed different seasonal distribution patterns：For areas around the North China Plain, the daytime seasonal mean AOD reached its highest level in summer with

关 键 词：在线耦合区域模式 气溶胶光学厚度AOD 季节变化 中国东部 MODIS AERONET 

分 类 号：X87[环境科学与工程—环境工程] X513