DOI: 10.5194/cp-11-571-2015
Scopus记录号: 2-s2.0-84961288515
论文题名: The impact of sahara desertification on arctic cooling during the holocene
作者: Davies F.J. ; Renssen H. ; Blaschek M. ; Muschitiello F.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 3 起始页码: 571
结束页码: 586
语种: 英语
Scopus关键词: albedo
; arctic environment
; climate modeling
; cooling
; desertification
; experimental design
; heat transfer
; Holocene
; insolation
; interglacial
; Northern Hemisphere
; sensitivity analysis
; surface pressure
; trade wind
; vegetation type
; westerly
; Sahara
英文摘要: Since the start of the Holocene, temperatures in the Arctic have steadily declined. This has been accredited to the orbitally forced decrease in summer insolation reconstructed over the same period. However, here we present climate modelling results from an Earth model of intermediate complexity (EMIC) that indicate that 17-40% of the cooling in the Arctic, over the period 9-0 ka, was a direct result of the desertification that occurred in the Sahara after the termination of the African Humid Period. We have performed a suite of sensitivity experiments to analyse the impact of different combinations of forcings, including various vegetation covers in the Sahara. Our simulations suggest that over the course of the Holocene, a strong increase in surface albedo in the Sahara as a result of desertification led to a regional increase in surface pressure, a weakening of the trade winds, the westerlies and the polar easterlies, which in turn reduced the meridional heat transported by the atmosphere to the Arctic. We conclude that during interglacials, the climate of the Northern Hemisphere is sensitive to changes in Sahara vegetation type. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49153
Appears in Collections: 气候变化与战略
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Recommended Citation:
Davies F.J.,Renssen H.,Blaschek M.,et al. The impact of sahara desertification on arctic cooling during the holocene[J]. Climate of the Past,2015-01-01,11(3)