DOI: 10.5194/cp-10-269-2014
Scopus记录号: 2-s2.0-84919595217
论文题名: Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions
作者: Colleoni F. ; Masina S. ; Cherchi A. ; Navarra A. ; Ritz C. ; Peyaud V. ; Otto-Bliesner B.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 1 起始页码: 269
结束页码: 291
语种: 英语
Scopus关键词: albedo
; atmosphere-ice-ocean system
; climate feedback
; climate modeling
; glacier
; ice sheet
; marine isotope stage
; Northern Hemisphere
; paleoclimate
; reconstruction
; sea ice
; thermomechanics
; three-dimensional modeling
英文摘要: The present manuscript compares Marine Isotope Stage 5 (MIS 5, 125-115 kyr BP) and MIS 7 (236-229 kyr BP) with the aim to investigate the origin of the difference in ice-sheet growth over the Northern Hemisphere high latitudes between these last two inceptions. Our approach combines a low resolution coupled atmosphere-ocean-sea-ice general circulation model and a 3-D thermo-mechanical ice-sheet model to simulate the state of the ice sheets associated with the inception climate states of MIS 5 and MIS 7. Our results show that external forcing (orbitals and GHG) and sea-ice albedo feedbacks are the main factors responsible for the difference in the land-ice initial state between MIS 5 and MIS 7 and that our cold climate model bias impacts more during a cold inception, such as MIS 7, than during a warm inception, such as MIS 5. In addition, if proper ice-elevation and albedo feedbacks are not taken into consideration, the evolution towards glacial inception is hardly simulated, especially for MIS 7. Finally, results highlight that while simulated ice volumes for MIS 5 glacial inception almost fit with paleo-reconstructions, the lack of precipitation over high latitudes, identified as a bias of our climate model, does not allow for a proper simulation of MIS 7 glacial inception. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49312
Appears in Collections: 气候变化与战略
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Recommended Citation:
Colleoni F.,Masina S.,Cherchi A.,et al. Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions[J]. Climate of the Past,2014-01-01,10(1)