DOI: 10.1175/JCLI-D-13-00608.1
Scopus记录号: 2-s2.0-84903386100
论文题名: Contributions of clouds, surface albedos, and mixed-phase ice nucleation schemes to Arctic radiation biases in CAM5
作者: English J.M. ; Kay J.E. ; Gettelman A. ; Liu X. ; Wang Y. ; Zhang Y. ; Chepfer H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 13 起始页码: 5174
结束页码: 5197
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate models
; Nucleation
; Optical radar
; Radiometry
; Snow
; Solar radiation
; Albedo
; Arctic
; Cloud forcing
; Cloud radiative effects
; Model evaluation/performance
; Ice
; albedo
; CALIPSO
; climate modeling
; cloud condensation nucleus
; lidar
; longwave radiation
; radiation balance
; radiative forcing
; shortwave radiation
; Arctic
; Ceres
英文摘要: The Arctic radiation balance is strongly affected by clouds and surface albedo. Prior work has identified Arctic cloud liquid water path (LWP) and surface radiative flux biases in the Community Atmosphere Model, version 5 (CAM5), and reductions to these biases with improved mixed-phase ice nucleation schemes. Here, CAM5 net top-of-atmosphere (TOA) Arctic radiative flux biases are quantified along with the contributions of clouds, surface albedos, and new mixed-phase ice nucleation schemes to these biases. CAM5 net TOA allsky shortwave (SW) and outgoing longwave radiation (OLR) fluxes are generally within 10Wm-2 of Clouds and the Earth's Radiant Energy System Energy Balanced and Filled (CERES-EBAF) observations. However, CAM5 has compensating SW errors: Surface albedos over snow are too high while cloud amount and LWP are too low. Use of a new CAM5 Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) lidar simulator that corrects an error in the treatment of snow crystal size confirms insufficient cloud amount in CAM5 year-round. CAM5 OLR is too low because of low surface temperature in winter, excessive atmospheric water vapor in summer, and excessive cloud heights year-round. Simulations with two new mixed-phase ice nucleation schemes-one based on an empirical fit to ice nuclei observations and one based on classical nucleation theory with prognostic ice nuclei-improve surface climate in winter by increasing cloud amount and LWP. However, netTOAand surface radiation biases remain because of increases in midlevel clouds and a persistent deficit in cloud LWP. These findings highlight challenges with evaluating and modeling Arctic cloud, radiation, and climate processes. © 2014 American Meteorological Society. 资助项目: DOE, National Aeronautics and Space Administration
; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51422
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, 3665 Discovery Drive, Boulder, CO, United States; Earth System Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric Science, University of Wyoming, Laramie, WY, United States; Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Lawrence Livermore National Laboratory, Livermore, CA, United States; LMD/IPSL, Université Pierre et Marie Curie, Paris, France
Recommended Citation:
English J.M.,Kay J.E.,Gettelman A.,et al. Contributions of clouds, surface albedos, and mixed-phase ice nucleation schemes to Arctic radiation biases in CAM5[J]. Journal of Climate,2014-01-01,27(13)