DOI: 10.1002/jgrd.50617
论文题名: Improvement of MODIS aerosol retrievals near clouds
作者: Wen G. ; Marshak A. ; Levy R.C. ; Remer L.A. ; Loeb N.G. ; Várnai T. ; Cahalan R.F.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 9168
结束页码: 9181
语种: 英语
Scopus关键词: Algorithms
; Atmospheric aerosols
; Radiometers
; Aerosol optical depths
; Aerosol particle sizes
; Aerosol-cloud interaction
; Boundary layer clouds
; Clouds and the Earth's radiant energy systems
; Moderate resolution imaging spectroradiometer
; Radiative interactions
; Satellite observations
; Satellite imagery
; aerosol
; algorithm
; cloud
; computer simulation
; MODIS
; molecular analysis
; optical depth
; satellite imagery
; three-dimensional modeling
英文摘要: The retrieval of aerosol properties near clouds from reflected sunlight is challenging. Sunlight reflected from clouds can effectively enhance the reflectance in nearby clear regions. Ignoring cloud 3-D radiative effects can lead to large biases in aerosol retrievals, risking an incorrect interpretation of satellite observations on aerosol-cloud interaction. Earlier, we developed a simple model to compute the cloud-induced clear-sky radiance enhancement that is due to radiative interaction between boundary layer clouds and the molecular layer above. This paper focuses on the application and implementation of the correction algorithm. This is the first time that this method is being applied to a full Moderate Resolution Imaging Spectroradiometer (MODIS) granule. The process of the correction includes converting Clouds and the Earth's Radiant Energy System broadband flux to visible narrowband flux, computing the clear-sky radiance enhancement, and retrieving aerosol properties.We find that the correction leads to smaller values in aerosol optical depth (AOD), Ångström exponent, and the small mode aerosol fraction of the total AOD. It also makes the average aerosol particle size larger near clouds than far away from clouds, which is more realistic than the opposite behavior observed in operational retrievals.We discuss issues in the current correction method as well as our plans to validate the algorithm. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63385
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: GESTAR, Morgan State University, Baltimore, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; University of Maryland Baltimore County, Joint Center for Earth Systems Technology, United States; NASA Langley Research Center, Hampton, VA, United States
Recommended Citation:
Wen G.,Marshak A.,Levy R.C.,et al. Improvement of MODIS aerosol retrievals near clouds[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)