| DOI: | 10.1007/s00382-011-1275-y
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| Scopus记录号: | 2-s2.0-84869505276
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| 论文题名: | On the Arctic Ocean ice thickness response to changes in the external forcing |
| 作者: | Stranne C.; Björk G.
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| 刊名: | Climate Dynamics
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| ISSN: | 9307575
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| 出版年: | 2012
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| 卷: | 39, 期:12 | | 起始页码: | 3007
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| 结束页码: | 3018
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| 语种: | 英语
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| 英文关键词: | Albedo feedback
; Arctic Ocean
; Divergence
; Ice export
; Sea ice
; Sensitivity
; Tipping point
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| 英文摘要: | Submarine and satellite observations show that the Arctic Ocean ice cover has undergone a large thickness reduction and a decrease in the areal extent during the last decades. Here the response of the Arctic Ocean ice cover to changes in the poleward atmospheric energy transport, Fwall, is investigated using coupled atmosphere-ice-ocean column models. Two models with highly different complexity are used in order to illustrate the importance of different internal processes and the results highlight the dramatic effects of the negative ice thickness-ice volume export feedback and the positive surface albedo feedback. The steady state ice thickness as a function of Fwall is determined for various model setups and defines what we call ice thickness response curves. When a variable surface albedo and snow precipitation is included, a complex response curve appears with two distinct regimes: a perennial ice cover regime with a fairly linear response and a less responsive seasonal ice cover regime. The two regimes are separated by a steep transition associated with surface albedo feedback. The associated hysteresis is however small, indicating that the Arctic climate system does not have an irreversible tipping point behaviour related to the surface albedo feedback. The results are discussed in the context of the recent reduction of the Arctic sea ice cover. A new mechanism related to regional and temporal variations of the ice divergence within the Arctic Ocean is presented as an explanation for the observed regional variation of the ice thickness reduction. Our results further suggest that the recent reduction in areal ice extent and loss of multiyear ice is related to the albedo dependent transition between seasonal and perennial ice i. e. large areas of the Arctic Ocean that has previously been dominated by multiyear ice might have been pushed below a critical mean ice thickness, corresponding to the above mentioned transition, and into a state dominated by seasonal ice. © 2011 Springer-Verlag. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/55132
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Department of Earth Sciences, University of Gothenburg, Box 460, 405 30 Göteborg, Sweden
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| Recommended Citation: | |
Stranne C.,Björk G.. On the Arctic Ocean ice thickness response to changes in the external forcing[J]. Climate Dynamics,2012-01-01,39(12)
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