Measurement-based estimation of the spatial gradient of aerosol radiative forcing

被引：20

作者：

Matsui, Toshihisa ^{[1
]}

Pielke, Roger A., Sr. ^{[1
]}

机构：

[1] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 11期

关键词：

D O I：

10.1029/2006GL025974

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This paper diagnoses the spatial mean and the spatial gradient of the aerosol radiative forcing in comparison with those of well-mixed green-house gases (GHG). Unlike GHG, aerosols have much greater spatial heterogeneity in their radiative forcing. The heterogeneous diabatic heating can modulate the gradient in horizontal pressure field and atmospheric circulations, thus altering the regional climate. For this, we diagnose the Normalized Gradient of Radiative Forcing (NGoRF), as a fraction of the present global heterogeneous insolation attributed to human activity. Although the GHG has a larger forcing (+ 1.7 Wm(-2)) as measured than those of aerosol direct ( - 1.59 Wm(-2)) and possible indirect effect ( - 1.38 Wm(-2)) in terms of a spatially averaged top-of-atmosphere value, the aerosol direct and indirect effects have far greater NGoRF values ( similar to 0.18) than that of GHG ( similar to 0.003).

引用

页数：5

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