Constraining cloud droplet number concentration in GCMs suppresses the aerosol indirect effect

被引：94

作者：

Hoose, C. ^{[1
]}

Kristjansson, J. E. ^{[1
]}

Iversen, T. ^{[3
]}

Kirkevag, A. ^{[3
]}

Seland, O. ^{[3
]}

Gettelman, A. ^{[2
]}

机构：

[1] Univ Oslo, Dept Geosci, N-0315 Oslo, Norway

[2] Natl Ctr Atmospher Res, Boulder, CO 80305 USA

[3] Norwegian Meteorol Inst, N-0313 Oslo, Norway

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

基金：

美国国家科学基金会;

关键词：

COMMUNITY ATMOSPHERE MODEL; CLIMATE MODEL; MICROPHYSICS SCHEME; SULFATE; CAM3;

D O I：

10.1029/2009GL038568

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Global aerosol-climate models with prognostic treatment of cloud droplet number concentration (CDNC) often prescribe lower bounds for CDNC or aerosol concentrations. Here we demonstrate that this possibly unphysical constraint reduces the simulated aerosol indirect effect by up to 80%, caused by extensively uniform CDNCs. In present-day conditions, the impact of the prescribed lower bound for CDNC is mainly visible over oceans, while with preindustrial emissions, large parts of both land and ocean areas are influenced. We furthermore show that imposing the same constraints on aerosol instead of on CDNC reduces the aerosol indirect effect to a lesser extent. Citation: Hoose, C., J. E. Kristjansson, T. Iversen, A. Kirkevag, O. Seland, and A. Gettelman (2009), Constraining cloud droplet number concentration in GCMs suppresses the aerosol indirect effect, Geophys. Res. Lett., 36, L12807, doi: 10.1029/2009GL038568.

引用

页数：5

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