DOI: 10.1016/j.atmosenv.2019.117216
论文题名: Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations
作者: Gueymard C.A. ; Yang D.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 225 语种: 英语
英文关键词: 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
学科: AERONET
; Aerosol optical depth
; Air quality
; CAMS
; MERRA-2
; Validation
; Ångström exponent
中文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160887
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Gueymard C.A.,Yang D.. Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations[J]. Atmospheric Environment,2020-01-01,225