DOI: 10.5194/cp-12-543-2016
Scopus记录号: 2-s2.0-84959317800
论文题名: The effect of low ancient greenhouse climate temperature gradients on the ocean's overturning circulation
作者: Sijp W.P. ; England M.H.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 2 起始页码: 543
结束页码: 552
语种: 英语
Scopus关键词: climate modeling
; Cretaceous
; greenhouse effect
; heat transfer
; kinetic energy
; meridional circulation
; Northern Hemisphere
; oceanic circulation
; overturn
; paleoceanography
; paleoclimate
; Paleogene
; temperature gradient
英文摘要: We examine whether the reduced meridional temperature gradients of past greenhouse climates might have reduced oceanic overturning, leading to a more quiescent subsurface ocean. A substantial reduction of the pole-to-Equator temperature difference is achieved in a coupled climate model via an altered radiative balance in the atmosphere. Contrary to expectations, we find that the meridional overturning circulation and deep ocean kinetic energy remain relatively unaffected. Reducing the wind strength also has remarkably little effect on the overturning. Instead, overturning strength depends on deep ocean density gradients, which remain relatively unaffected by the surface changes, despite an overall decrease in ocean density. Ocean poleward heat transport is significantly reduced only in the Northern Hemisphere, as now the circulation operates across a reduced temperature gradient, suggesting a sensitivity of Northern Hemisphere heat transport in greenhouse climates to the overturning circulation. These results indicate that climate models of the greenhouse climate during the Cretaceous and early Paleogene may yield a reasonable overturning circulation, despite failing to fully reproduce the extremely reduced temperature gradients of those time periods. © Author(s) 2016. 资助项目: ARC, Australian Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49053
Appears in Collections: 气候变化与战略
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Recommended Citation:
Sijp W.P.,England M.H.. The effect of low ancient greenhouse climate temperature gradients on the ocean's overturning circulation[J]. Climate of the Past,2016-01-01,12(2)