First observational estimates of global clear sky shortwave aerosol direct radiative effect over land

被引：32
|
作者：
Patadia, Falguni [1 ]
Gupta, Pawan [1 ]
Christopher, Sundar A. [1 ]
机构：
[1] Univ Alabama, Dept Atmospher Sci, Huntsville, AL 35806 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 04期
关键词：
D O I：
10.1029/2007GL032314
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Using one year (2000-2001) of merged Multiangle Imaging SpectroRadiometer (MISR), Moderate Resolution Imaging SpectroRadiometer (MODIS) and Clouds and the Earth's Radiant Energy System (CERES) data sets from NASA's Terra satellite, we estimate the top of atmosphere cloud-free direct radiative effect (DRE) of aerosols over global land areas. The global mean shortwave DRE is -5.1 +/- 1.1 Wm(-2) although substantial regional variability in DRE over land exists due to differences in aerosol properties and land cover types. This value is consistent with those reported in the literature although this is the first observational estimate of the global DRE over land using satellite data alone. Future studies need to separate the anthropogenic component of aerosols from satellite data to examine aerosol climate forcing over global scales.
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页数：5
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