DOI: 10.1175/JCLI-D-12-00112.1
Scopus记录号: 2-s2.0-84872981954
论文题名: Longwave band-by-band cloud radiative effect and its application in GCM evaluation
作者: Huang X. ; Cole J.N.S. ; He F. ; Potter G.L. ; Oreopoulos L. ; Lee D. ; Suarez M. ; Loeb N.G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 2 起始页码: 450
结束页码: 467
语种: 英语
Scopus关键词: Atmospheric infrared sounders
; Atmospheric model
; Canadian centre for climate modelling and analysis
; Cloud fraction
; Clouds and the Earth's radiant energy systems
; Diagnostic metric
; Goddard earth observing systems
; In-phase
; Interannual
; Long waves
; Macroscopic properties
; Radiative effects
; Seasonal cycle
; Tropical ocean
; Climate models
; Infrared devices
; Infrared instruments
; NASA
; Computer simulation
; atmospheric general circulation model
; cloud radiative forcing
; longwave radiation
; seasonal variation
; spatial distribution
英文摘要: The cloud radiative effect (CRE) of each longwave (LW) absorption band of a GCM's radiation code is uniquely valuable for GCM evaluation because 1) comparing band-by-band CRE avoids the compensating biases in the broadband CRE comparison and 2) the fractional contribution of each band to the LW broadband CRE (fCRE) is sensitive to cloud-top height but largely insensitive to cloud fraction, thereby presenting a diagnostic metric to separate the two macroscopic properties of clouds. Recent studies led by the first author haveestablished methods to derive such band-by-band quantities from collocated Atmospheric Infrared Sounder (AIRS) and Clouds and the Earth's Radiant Energy System (CERES)observations. A study is presented here that compares the observed band-by-band CRE over the tropical oceans with those simulated by three different atmospheric GCMs-the GFDL Atmospheric Model version 2 (GFDL AM2), NASA Goddard Earth Observing System version 5 (GEOS-5), and the fourth-generation AGCM of the Canadian Centre for Climate Modelling and Analysis (CCCmaCanAM4)-forced by observed SST. The models agree with observation on the annual-mean LW broadband CRE over the tropical oceans within ±1 W m-2. However, the differences among these three GCMs in some bands can be as large as or even largerthan ±1 W m-2. Observed seasonal cycles of fCRE in major bands are shown to be consistent with the seasonal cycle ofcloud-top pressure for both the amplitude and the phase. However, while the three simulated seasonal cycles of fCRE agree with observations on the phase, the amplitudes are underestimated. Simulated interannual anomalies from GFDL AM2 and CCCma CanAM4 are in phase with observed anomalies. The spatial distribution of fCRE highlights the discrepancies between models and observation over the low-cloud regions and the compensating biases from different bands. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52056
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, United States; Canadian Centre for Climate Modeling and Analysis, Environment Canada, Toronto, ON, Canada; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Climate Dynamics Laboratory, Seoul National University, Seoul, South Korea; Radiation and Climate Branch, NASA Langley Research Center, Hampton, VA, United States
Recommended Citation:
Huang X.,Cole J.N.S.,He F.,et al. Longwave band-by-band cloud radiative effect and its application in GCM evaluation[J]. Journal of Climate,2013-01-01,26(2)