DOI: 10.1029/2012JD018388
论文题名: Direct and semi-direct aerosol effects in the NASA GEOS-5 AGCM: Aerosol-climate interactions due to prognostic versus prescribed aerosols
作者: Randles C.A. ; Colarco P.R. ; Da Silva A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 1 起始页码: 149
结束页码: 169
语种: 英语
英文关键词: absorbing aerosols
; aerosol
; aerosol direct effect
; aerosol semi-direct effect
; aerosol-climate interactions
; prognostic aerosols
Scopus关键词: Aerosols
; Atmospheric aerosols
; Climatology
; NASA
; Absorbing aerosol
; Aerosol distribution
; Aerosol optical depths
; Aerosol-climate interactions
; Atmospheric general circulation models
; Dynamical response
; Goddard earth observing systems
; Oceanic environments
; Climate models
; aerosol composition
; atmospheric forcing
; atmospheric general circulation model
; EOS
; Hadley cell
; humidity
; NSCAT
; optical depth
; timescale
; zonal wind
英文摘要: The present-day climate response to aerosol direct and semi-direct effects is investigated using the NASA Goddard Earth Observing System version 5 (GEOS-5) atmospheric general circulation model. We focus our investigation on aerosol-climate interactions by using either prognostic aerosols from an online aerosol module or aerosols from a climatology based on the prognostic aerosols. As found in previous studies, forcing from all aerosols cools the land surface, warms the troposphere, and impacts global mean circulation, affecting both the strength of the Hadley cell and the zonal mean wind. Less absorbing natural aerosol alone tends to have weaker impacts on global climate. We find that removing the feedback of meteorology on aerosol distributions can significantly impact the climate response depending on the parameter, region, and season considered. Much of the differing climate response to prognostic and prescribed aerosols occurs in regions remote from direct aerosol forcing, such as in the stratosphere and the northern and southern high latitudes. This suggests that aerosol-climate interactions may induce remote dynamical responses to aerosol forcing in global models. The largest effect of removing coupling is to enhance the aerosol optical depth globally over the oceans. This enhancement is due to the removal of the co-variability between aerosol mass and relative humidity on sub-monthly timescales in the high humidity oceanic environment. Key points Aerosol-climate interactions impacts are important for climate response Remote response to aerosol-climate interactions suggests a dynamical link Natural aerosol response is weaker and opposite in sign. © 2012 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/63971
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, Atmospheric Chemistry and Dynamics Lab, Greenbelt, MD, United States; NASA Goddard Space Flight Center, Global Modeling and Assimilation Office, Greenbelt, MD, United States
Recommended Citation:
Randles C.A.,Colarco P.R.,Da Silva A.. Direct and semi-direct aerosol effects in the NASA GEOS-5 AGCM: Aerosol-climate interactions due to prognostic versus prescribed aerosols[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(1)