DOI: 10.5194/cp-9-969-2013
Scopus记录号: 2-s2.0-84881159363
论文题名: The sensitivity of the Arctic sea ice to orbitally induced insolation changes: A study of the mid-holocene paleoclimate modeling intercomparison project 2 and 3 simulations
作者: Berger M. ; Brandefelt J. ; Nilsson J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 2 起始页码: 969
结束页码: 982
语种: 英语
Scopus关键词: carbon dioxide
; concentration (composition)
; Holocene
; ice cover
; numerical model
; paleoclimate
; sea ice
; sensitivity analysis
; Arctic Ocean
英文摘要: In the present work the Arctic sea ice in the mid-Holocene and the pre-industrial climates are analysed and compared on the basis of climate-model results from the Paleoclimate Modelling Intercomparison Project phase 2 (PMIP2) and phase 3 (PMIP3). The PMIP3 models generally simulate smaller and thinner sea-ice extents than the PMIP2 models both for the pre-industrial and the mid-Holocene climate. Further, the PMIP2 and PMIP3 models all simulate a smaller and thinner Arctic summer sea-ice cover in the mid-Holocene than in the pre-industrial control climate. The PMIP3 models also simulate thinner winter sea ice than the PMIP2 models. The winter sea-ice extent response, i.e. the difference between the mid-Holocene and the pre-industrial climate, varies among both PMIP2 and PMIP3 models. Approximately one half of the models simulate a decrease in winter sea-ice extent and one half simulates an increase. The model-mean summer sea-ice extent is 11% (21 %) smaller in the mid-Holocene than in the pre-industrial climate simulations in the PMIP2 (PMIP3). In accordance with the simple model of Thorndike (1992), the sea-ice thickness response to the insolation change from the pre-industrial to the mid-Holocene is stronger in models with thicker ice in the pre-industrial climate simulation. Further, the analyses show that climate models for which the Arctic sea-ice responses to increasing atmospheric CO2 concentrations are similar may simulate rather different sea-ice responses to the change in solar forcing between the mid-Holocene and the pre-industrial. For two specific models, which are analysed in detail, this difference is found to be associated with differences in the simulated cloud fractions in the summer Arctic; in the model with a larger cloud fraction the effect of insolation change is muted. A sub-set of the mid-Holocene simulations in the PMIP ensemble exhibit open water off the north-eastern coast of Greenland in summer, which can provide a fetch for surface waves. This is in broad agreement with recent analyses of sea-ice proxies, indicating that beachridges formed on the north-eastern coast of Greenland during the early- to mid-Holocene.© 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49434
Appears in Collections: 气候变化与战略
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Recommended Citation:
Berger M.,Brandefelt J.,Nilsson J.. The sensitivity of the Arctic sea ice to orbitally induced insolation changes: A study of the mid-holocene paleoclimate modeling intercomparison project 2 and 3 simulations[J]. Climate of the Past,2013-01-01,9(2)