DOI: 10.1002/2015GL066005
论文题名: The relative contribution of orbital forcing and greenhouse gases to the North American deglaciation
作者: Gregoire L.J. ; Valdes P.J. ; Payne A.J.
刊名: Geophysical Research Letters
ISSN: 0094-8424
EISSN: 1944-8155
出版年: 2015
卷: 42, 期: 22 起始页码: 9970
结束页码: 9979
语种: 英语
英文关键词: deglaciation
; greenhouse gases
; ice sheets
; Milankovic
; North America
; orbit
Scopus关键词: Carbon dioxide
; Glaciers
; Greenhouse gases
; Orbits
; Deglaciations
; Ice sheet
; Milankovic
; North America
; Northern Hemispheres
; Ocean atmosphere general circulation models
; Primitive equations
; Relative contribution
; Ice
; atmosphere-ocean coupling
; general circulation model
; greenhouse gas
; ice sheet
; last deglaciation
; melting
; Milankovitch cycle
; Northern Hemisphere
; orbital forcing
; volume change
; North America
英文摘要: Understanding what drove Northern Hemisphere ice sheet melt during the last deglaciation (21-7 ka) can help constrain how sensitive contemporary ice sheets are to greenhouse gas (GHGs) changes. The roles of orbital forcing and GHGs in the deglaciation have previously been modeled but not yet quantified. Here for the first time we calculate the relative effect of these forcings on the North American deglaciation by driving a dynamical ice sheet model (GLIMMER-CISM) with a set of unaccelerated transient deglacial simulations with a full primitive equation-based ocean-atmosphere general circulation model (FAMOUS). We find that by 9 ka, orbital forcing has caused 50% of the deglaciation, GHG 30%, and the interaction between the two 20%. Orbital forcing starts affecting the ice volume at 19 ka, 2000 years before CO2 starts increasing in our experiments, a delay which partly controls their relative effect. Key Points We decompose the forcings of North American ice volume changes during the last deglaciation Orbital forcing drives 50%, greenhouse gases 30%, and forcing interactions 20% of the deglaciation The difference in timing of the forcings partly explains their relative contribution. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956906669&doi=10.1002%2f2015GL066005&partnerID=40&md5=0c555e8aa04a81867ceb5f0373e7f227
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8040
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Earth and Environment, University of Leeds, Leeds, United Kingdom
Recommended Citation:
Gregoire L.J.,Valdes P.J.,Payne A.J.. The relative contribution of orbital forcing and greenhouse gases to the North American deglaciation[J]. Geophysical Research Letters,2015-01-01,42(22).