DOI: 10.1175/JCLI-D-13-00635.1
Scopus记录号: 2-s2.0-84903387395
论文题名: Evaluation of the surface representation of the Greenland Ice sheet in a general circulation model
作者: Cullather R.I. ; Nowicki S.M.J. ; Zhao B. ; Suarez M.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 13 起始页码: 4835
结束页码: 4856
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate models
; Glacial geology
; Glaciers
; Solvents
; General circulation model
; Ice sheet
; Land surface modeling
; Snowmelt
; Surface flux
; Surface temperatures
; Computer simulation
; albedo
; atmospheric general circulation model
; climate modeling
; energy flux
; EOS
; land surface
; runoff
; seasonal variation
; snowmelt
; spatial resolution
; spatial variation
; surface flux
; surface temperature
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Simulated surface conditions of the Goddard Earth Observing System model, version 5 (GEOS-5), atmospheric general circulation model (AGCM) are examined for the contemporary Greenland Ice Sheet (GrIS). A surface parameterization that explicitly models surface processes including snow compaction, meltwater percolation and refreezing, and surface albedo is found to remedy an erroneous deficit in the annual net surface energy flux and provide an adequate representation of surface mass balance (SMB) in an evaluation using simulations at two spatial resolutions. The simulated 1980-2008 GrIS SMB average is 24.7 ± 4.5 cm yr-1 water-equivalent (w.e.) at 1/2° model grid spacing, and 18.2 ± 3.3 cm yr-1 w.e. for 2° grid spacing. The spatial variability and seasonal cycle of the 1/2° simulation compare favorably to recent studies using regional climate models, while results from 2° integrations reproduce the primary features of theSMBfield. In comparison to historical glaciological observations, the coarser-resolution model overestimates accumulation in the southern areas of the GrIS, while the overall SMB is underestimated. These changes relate to the sensitivity of accumulation and melt to the resolution of topography. The GEOS-5 SMB fields contrast with available corresponding atmospheric models simulations from phase 5 of the Coupled Model Intercomparison Project (CMIP5). It is found that only a few of the CMIP5 AGCMs examined provide significant summertime runoff, a dominant feature of the GrIS seasonal cycle. This is a condition that will need to be remedied if potential contributions to future eustatic change from polar ice sheets are to be examined with GCMs. © 2014 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
; NCCS, 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/51224
Appears in Collections: 气候变化事实与影响
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作者单位: Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, MD, United States; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Science Applications International Corporation, Greenbelt, MD, United States; Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Cullather R.I.,Nowicki S.M.J.,Zhao B.,et al. Evaluation of the surface representation of the Greenland Ice sheet in a general circulation model[J]. Journal of Climate,2014-01-01,27(13)