气候变化领域集成服务门户(CCPortal): Credibility and statistical characteristics of CAMSRA and MERRA-2 AOD reanalysis products over the Sichuan Basin during 2003

CCPortal

DOI	10.1016/j.atmosenv.2020.117980
	Credibility and statistical characteristics of CAMSRA and MERRA-2 AOD reanalysis products over the Sichuan Basin during 2003–2018
	Liu H.; Yan R.; Yang J.
发表日期	2021
ISSN	1352-2310
卷号	244
英文摘要	Owing to its large population, unique topography, and rapid industrialization and urbanization, the Sichuan Basin (SCB) is one of the most polluted regions in China, as reflected by the large aerosol optical depth (AOD). In this study, the credibility of two long-term atmospheric composition reanalysis datasets—the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) and Copernicus Atmosphere Monitoring Service Reanalysis (CAMSRA)—are evaluated using Moderate Resolution Imaging Spectroradiometer (MODIS) AOD products over the SCB during 2003–2018. The time series of the three datasets at seasonal, monthly and annual scales exhibit some interesting similarities and differences, but with all of them demonstrating a prominent slowing down of the severe air pollution status over the SCB since 2012 (−0.25/7yrs for MODIS and CAMSRA and −0.12/7yrs for MERRA-2). CAMSRA shows good consistency with MODIS at all time scales (correlation coefficients varying from 0.89 to 0.97 at four seasons) despite its systematic overestimation (～0.2) throughout the 16-year study period. MERRA-2 has a negative deviation during 2003–2006 and then maintains an increasing positive deviation in the following years (0.05–0.2). This positive bias increases as MODIS AOD declines prominently from 2014. The good temporal consistency of CAMSRA is partly attributable to the bias correction of the assimilated remotely sensed AOD from MODIS and AATSR (Advanced Along-Track Scanning Radiometer). The differences between the reanalysis and MODIS are obvious during October–December, which may be related to the cloud contamination effects as well as the uncertainties of emissions in each model system. The uniform decreasing trend of the three datasets since 2012 supports the effects of the tough emissions reduction policy, which is also evident in AOD changes of anthropogenic species. It is concluded that atmospheric composition reanalysis data with good spatial and temporal coverage can be considered in future air quality analyses over the SCB. However, the bias and regional dependence should be handled carefully. © 2020 Elsevier Ltd
关键词	Aerosol optical depth CAMSRA Data evaluation MERRA-2 MODIS Sichuan basin
语种	英语
scopus关键词	Air quality; Atmospheric composition; Emission control; Topography; Advanced-along track scanning radiometers; Aerosol optical depths; Anthropogenic species; Correlation coefficient; Moderate resolution imaging spectroradiometer; Research and application; Retrospective analysis; Statistical characteristics; Radiometers; aerosol; atmospheric pollution; correction; data set; industrialization; MODIS; optical depth; time series; aerosol optical depth; air analysis; air pollution; air quality; Article; autumn; China; cloud; data analysis; physical parameters; priority journal; seasonal variation; secondary organic aerosol; statistical analysis; statistical bias; summer; time series analysis; uncertainty; winter; China; Sichuan Basin
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248800
作者单位	State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Earth Surface Process and Resource Ecology/Key Laboratory of Environmental Change and Natural Disaster, Faculty of Geographical Science, Beijing Normal University, Beijing, China
推荐引用方式 GB/T 7714	Liu H.,Yan R.,Yang J.. Credibility and statistical characteristics of CAMSRA and MERRA-2 AOD reanalysis products over the Sichuan Basin during 2003–2018[J],2021,244.
APA	Liu H.,Yan R.,&Yang J..(2021).Credibility and statistical characteristics of CAMSRA and MERRA-2 AOD reanalysis products over the Sichuan Basin during 2003–2018.ATMOSPHERIC ENVIRONMENT,244.
MLA	Liu H.,et al."Credibility and statistical characteristics of CAMSRA and MERRA-2 AOD reanalysis products over the Sichuan Basin during 2003–2018".ATMOSPHERIC ENVIRONMENT 244(2021).