DOI: 10.5194/cp-10-2135-2014
Scopus记录号: 2-s2.0-84916198339
论文题名: Interaction of ice sheets and climate during the past 800 000 years
作者: Stap L.B. ; Van De Wal R.S.W. ; De Boer B. ; Bintanja R. ; Lourens L.J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 6 起始页码: 2135
结束页码: 2152
语种: 英语
Scopus关键词: albedo
; Cenozoic
; climate change
; climate forcing
; energy balance
; ice core
; ice sheet
; paleoclimate
; proxy climate record
; simulation
; timescale
英文摘要: During the Cenozoic, land ice and climate interacted on many different timescales. On long timescales, the effect of land ice on global climate and sea level is mainly set by large ice sheets in North America, Eurasia, Greenland and Antarctica. The climatic forcing of these ice sheets is largely determined by the meridional temperature profile resulting from radiation and greenhouse gas (GHG) forcing. As a response, the ice sheets cause an increase in albedo and surface elevation, which operates as a feedback in the climate system. To quantify the importance of these climate-land ice processes, a zonally averaged energy balance climate model is coupled to five one-dimensional ice sheet models, representing the major ice sheets. In this study, we focus on the transient simulation of the past 800 000 years, where a high-confidence CO2 record from ice core samples is used as input in combination with Milankovitch radiation changes. We obtain simulations of atmospheric temperature, ice volume and sea level that are in good agreement with recent proxy-data reconstructions. We examine long-term climate-ice-sheet interactions by a comparison of simulations with uncoupled and coupled ice sheets. We show that these interactions amplify global temperature anomalies by up to a factor of 2.6, and that they increase polar amplification by 94 %. We demonstrate that, on these long timescales, the ice-albedo feedback has a larger and more global influence on the meridional atmospheric temperature profile than the surface-height-temperature feedback. Furthermore, we assess the influence of CO2 and insolation by performing runs with one or both of these variables held constant. We find that atmospheric temperature is controlled by a complex interaction of CO2 and insolation, and both variables serve as thresholds for northern hemispheric glaciation. © Author(s) 2014. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49199
Appears in Collections: 气候变化与战略
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Recommended Citation:
Stap L.B.,Van De Wal R.S.W.,De Boer B.,et al. Interaction of ice sheets and climate during the past 800 000 years[J]. Climate of the Past,2014-01-01,10(6)