DOI: 10.1002/2013JD020393
论文题名: Aerosol optical depths over oceans: A view from MISR retrievals and collocated MAN and AERONET in situ observations
作者: Witek M.L. ; Garay M.J. ; Diner D.J. ; Smirnov A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 22 起始页码: 12620
结束页码: 12633
语种: 英语
英文关键词: AERONET
; aerosols
; AOD retrievals
; MAN
; MISR
Scopus关键词: Aerosols
; Atmospheric aerosols
; Uncertainty analysis
; AERONET
; Aerosol robotic networks
; AOD retrievals
; Chemical transport models
; Ground based measurement
; MAN
; MISR
; Multiangle imaging spectroradiometer
; Oceanography
; data set
; error analysis
; ground-based measurement
; in situ measurement
; marine atmosphere
; MISR
; optical depth
; satellite imagery
英文摘要: In this study, aerosol optical depths over oceans are analyzed from satellite and surface perspectives. Multiangle Imaging SpectroRadiometer (MISR) aerosol retrievals are investigated and validated primarily against Maritime Aerosol Network (MAN) observations. Furthermore, AErosol RObotic NETwork (AERONET) data from 19 island and coastal sites is incorporated in this study. The 270 MISR/MAN comparison points scattered across all oceans were identified. MISR on average overestimates aerosol optical depths (AODs) by 0.04 as compared to MAN; the correlation coefficient and root-mean-square error are 0.95 and 0.06, respectively. A new screening procedure based on retrieval region characterization is proposed, which is capable of substantially reducing MISR retrieval biases. Over 1000 additional MISR/AERONET comparison points are added to the analysis to confirm the validity of the method. The bias reduction is effective within all AOD ranges. Setting a clear flag fraction threshold to 0.6 reduces the bias to below 0.02, which is close to a typical ground-based measurement uncertainty. Twelve years of MISR data are analyzed with the new screening procedure. The average over ocean AOD is reduced by 0.03, from 0.15 to 0.12. The largest AOD decrease is observed in high latitudes of both hemispheres, regions with climatologically high cloud cover. It is postulated that the screening procedure eliminates spurious retrieval errors associated with cloud contamination and cloud adjacency effects. The proposed filtering method can be used for validating aerosol and chemical transport models. Key Points MISR AOD retrievals are analyzed with respect to MAN and AERONET MISR biases can be reduced by applying CFF filtering procedure The new filtering procedure reduces the global AOD by 0.03 ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63167
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States; Sigma Space Corporation, Lanham, MD, United States
Recommended Citation:
Witek M.L.,Garay M.J.,Diner D.J.,et al. Aerosol optical depths over oceans: A view from MISR retrievals and collocated MAN and AERONET in situ observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(22)