DOI: 10.1002/jgrd.50449
论文题名: Estimating the direct radiative effect of absorbing aerosols overlying marine boundary layer clouds in the southeast Atlantic using MODIS and CALIOP
作者: Meyer K. ; Platnick S. ; Oreopoulos L. ; Lee D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4801
结束页码: 4815
语种: 英语
英文关键词: aerosols
; clouds
; radiative forcing
; remote sensing
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric radiation
; Boundary layers
; Clouds
; Estimation
; Optical radar
; Radiometers
; Remote sensing
; Satellite imagery
; Smoke
; Sun
; Cloud optical properties
; Cloud optical thickness
; Cloud-aerosol lidar with orthogonal polarizations
; Marine boundary layer clouds
; Marine boundary layers
; Moderate resolution imaging spectroradiometer
; Radiative forcing efficiency
; Radiative forcings
; Liquids
; aerosol
; biomass burning
; boundary layer
; cloud radiative forcing
; MODIS
; optical depth
; optical property
; remote sensing
; smoke
; solar radiation
; stratocumulus
; Atlantic Ocean
; Atlantic Ocean (Southeast)
; Southern Africa
英文摘要: Absorbing aerosols such as smoke strongly absorb solar radiation, particularly at ultraviolet and visible/near-infrared (VIS/NIR) wavelengths, and their presence above clouds can have considerable implications. It has been previously shown that they have a positive (i.e., warming) direct aerosol radiative effect (DARE) when overlying bright clouds. Additionally, they can cause biased passive instrument satellite retrievals in techniques that rely on VIS/NIR wavelengths for inferring the cloud optical thickness (COT) and effective radius (re ) of underlying clouds, which can in turn yield biased above-cloud DARE estimates. Here we investigate Moderate Resolution Imaging Spectroradiometer (MODIS) cloud optical property retrieval biases due to overlying absorbing aerosols observed by Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and examine the impact of these biases on above-cloud DARE estimates. The investigation focuses on a region in the southeast Atlantic Ocean during August and September (2006-2011), where smoke from biomass burning in southern Africa overlies persistent marine boundary layer stratocumulus clouds. Adjusting for above-cloud aerosol attenuation yields increases in the regional mean liquid COT (averaged over all ocean-only liquid clouds) by roughly 6%; mean re increases by roughly 2.6%, almost exclusively due to the COT adjustment in the non-orthogonal retrieval space. It is found that these two biases lead to an underestimate of DARE. For liquid cloud Aqua MODIS pixels with CALIOP-observed above-cloud smoke, the regional mean above-cloud radiative forcing efficiency (DARE per unit aerosol optical depth (AOD)) at time of observation (near local noon for Aqua overpass) increases from 50.9Wm -2AOD-1 to 65.1Wm-2AOD-1 when using bias-adjusted instead of nonadjusted MODIS cloud retrievals. Key Points MODIS liquid cloud retrievals biased by overlying absorbing aerosols.CALIOP above-cloud AOD used to adjust MODIS cloud retrievals.Effects of bias-adjusted cloud retrievals on DARE estimates examined. ©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/63777
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: Goddard Earth Sciences Technology and Research (GESTAR), Universities Space Research Association, Columbia MD, United States; NASA Goddard Space Flight Center, Code 613.0, Greenbelt, MD 20771, United States
Recommended Citation:
Meyer K.,Platnick S.,Oreopoulos L.,et al. Estimating the direct radiative effect of absorbing aerosols overlying marine boundary layer clouds in the southeast Atlantic using MODIS and CALIOP[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)