DOI: 10.1007/s00382-013-1935-1
Scopus记录号: 2-s2.0-84905099921
论文题名: Early Last Interglacial Greenland Ice Sheet melting and a sustained period of meridional overturning weakening: A model analysis of the uncertainties
作者: Bakker P. ; Renssen H. ; Van Meerbeeck C.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-03-04 起始页码: 1025
结束页码: 1039
语种: 英语
英文关键词: Last Interglacial
; Overturning circulation
; Palaeoclimate modelling
; Stability
英文摘要: Proxy-data suggest that the Last Interglacial (LIG; ~130-116 ka BP) climate was characterized by higher temperatures, a partially melted Greenland Ice Sheet (GIS) and a changed Atlantic meridional overturning circulation (AMOC). Notwithstanding the uncertainties in LIG palaeoclimatic reconstructions, this setting potentially provides an opportunity to evaluate the relation between GIS melt and the AMOC as simulated by climate models. However, first we need to assess the extent to which a causal relation between early LIG GIS melt and the weakened AMOC is plausible. With a series of transient LIG climate simulations with the LOVECLIM earth system model, we quantify the importance of the major known uncertainties involved in early LIG GIS melt scenarios. Based on this we construct a specific scenario that is within the parameter space of uncertainties and show that it is physically consistent that early LIG GIS melting kept the AMOC weakened. Notwithstanding, this scenario is at the extreme end of the parameter space. Assuming that proxy-based reconstructions of early LIG AMOC weakening offer a realistic representation of its past state, this indicates that either (1) the AMOC weakening was caused by other forcings than early LIG GIS melt or (2) the early LIG AMOC was less stable than indicated by our simulations and a small amount of GIS melt was sufficient to keep the AMOC in the weak state of a bi-stable regime. We argue that more intensive research is required because of the high potential of the early LIG to evaluate model performance in relation to the AMOC response to GIS melt. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54500
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Earth and Climate Cluster, VU University Amsterdam, Amsterdam, Netherlands; Caribbean Institute for Meteorology and Hydrology, Husbands, Barbados
Recommended Citation:
Bakker P.,Renssen H.,Van Meerbeeck C.J.. Early Last Interglacial Greenland Ice Sheet melting and a sustained period of meridional overturning weakening: A model analysis of the uncertainties[J]. Climate Dynamics,2014-01-01,43(2017-03-04)