气候变化领域集成服务门户(CCPortal): Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations

CCPortal

DOI	10.1016/j.atmosenv.2019.117216
	Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations
	Gueymard C.A.; Yang D.
发表日期	2020
ISSN	1352-2310
卷号	225
英文摘要	This contribution compares 3-hourly estimates of aerosol optical depth at 550 nm (AOD550) and Ångström exponent (AE) from two similar reanalysis models, ECMWF's CAMS and NASA's MERRA-2, to reference remote-sensed observations from the worldwide AERONET network during the period 2003–2017. All data points are first subjected to a thorough quality assessment analysis. All valid AOD550 reanalysis estimates are also corrected to account for the difference in elevation between the nominal grid cell size (0.5 × 0.625°) and the reference AERONET ground station. Comparative results are obtained both on a continental basis and on climate disaggregation basis using the Köppen-Geiger (KG) classification. Based on 793 AERONET stations and ≈1.8 million valid 3-h data points, it is found that CAMS and MERRA-2 behave relatively similarly, with however some regional differences, depending on continent or KG class. AOD550's root-mean-square error (RMSE) varies in the range 0.031–0.268 for CAMS and 0.017–0.232 for MERRA-2, depending on continent. Globally, MERRA-2 performs better than CAMS, achieving an RMSE of 0.126, as compared to 0.144 for CAMS. In contrast, the two reanalyses have very similar overall RMSEs for AE, i.e., 0.382 for CAMS and 0.378 for MERRA-2. For local or regional studies, these results allow users to select the best possible source of data. For global studies, both aerosol products are found appropriate, albeit with different statistical properties. © 2019 Elsevier Ltd
关键词	AERONET Aerosol optical depth Air quality CAMS MERRA-2 Validation Ångström exponent
语种	英语
scopus关键词	Air quality; Cams; Mean square error; NASA; Optical properties; Remote sensing; AERONET; Aerosol optical depths; MERRA-2; Quality assessment; Regional differences; Root mean square errors; Statistical properties; Validation; Aerosols; AERONET; aerosol; aerosol property; air quality; atmospheric modeling; ground-based measurement; image classification; model validation; observatory; optical depth; remote sensing; satellite altimetry; aerosol; air quality; article; climate; optical depth
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/249271
作者单位	Solar Consulting Services, Colebrook, NH, 03576, United States; Singapore Institute of Manufacturing Technology, Agency for Science, Technology and Research (A*STAR), Singapore
推荐引用方式 GB/T 7714	Gueymard C.A.,Yang D.. Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations[J],2020,225.
APA	Gueymard C.A.,&Yang D..(2020).Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations.ATMOSPHERIC ENVIRONMENT,225.
MLA	Gueymard C.A.,et al."Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations".ATMOSPHERIC ENVIRONMENT 225(2020).