DOI: 10.5194/tc-12-365-2018
Scopus记录号: 2-s2.0-85041327611
论文题名: Consistent biases in Antarctic sea ice concentration simulated by climate models
作者: Roach L ; A ; , Dean S ; M ; , Renwick J ; A
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 1 起始页码: 365
结束页码: 383
语种: 英语
英文关键词: climate modeling
; CMIP
; global climate
; ice cover
; sea ice
; simulation
; thermodynamics
; Southern Ocean
英文摘要: The simulation of Antarctic sea ice in global climate models often does not agree with observations. In this study, we examine the compactness of sea ice, as well as the regional distribution of sea ice concentration, in climate models from the latest Coupled Model Intercomparison Project (CMIP5) and in satellite observations. We find substantial differences in concentration values between different sets of satellite observations, particularly at high concentrations, requiring careful treatment when comparing to models. As a fraction of total sea ice extent, models simulate too much loose, low-concentration sea ice cover throughout the year, and too little compact, high-concentration cover in the summer. In spite of the differences in physics between models, these tendencies are broadly consistent across the population of 40 CMIP5 simulations, a result not previously highlighted. Separating models with and without an explicit lateral melt term, we find that inclusion of lateral melt may account for overestimation of low-concentration cover. Targeted model experiments with a coupled ocean-sea ice model show that choice of constant floe diameter in the lateral melt scheme can also impact representation of loose ice. This suggests that current sea ice thermodynamics contribute to the inadequate simulation of the low-concentration regime in many models. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75429
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: National Institute of Water and Atmospheric Research, 301 Evans Bay Parade, Greta Point, Wellington, New Zealand; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand
Recommended Citation:
Roach L,A,, Dean S,et al. Consistent biases in Antarctic sea ice concentration simulated by climate models[J]. Cryosphere,2018-01-01,12(1)