干旱区生态环境知识资源中心(Arid): Modeling climate-vegetation interactions during the last interglacial: The impact of biogeophysical feedbacks in North Africa

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DOI	10.1016/j.quascirev.2020.106609
	Modeling climate-vegetation interactions during the last interglacial: The impact of biogeophysical feedbacks in North Africa
	Li, Huan; Renssen, Hans; Roche, Didier M.
通讯作者	Li, H
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
出版年	2020
卷号	249
英文摘要	Previous climate model simulations of the early Last Interglacial (LIG) underestimated the temperatures compared to proxy-based reconstructions. One possible reason for this underestimation is that in these simulations the vegetation was prescribed to a pre-industrial state. To study the impact of climate-vegetation interactions, we performed a series of model experiments using the iLOVECLIM climate model, in which either VECODE or LPJ-GUESS was coupled as vegetation component. We specifically assessed the evolution of vegetation during the LIG and the magnitude of dynamical vegetation feedbacks. Our results show a relatively high vegetation cover (>70%) in the Sahara during the early LIG when the summer insolation at 20 degrees N was high. This early stage is followed by an accelerated desertification phase after 123 ka BP. The rates of desertification in the Sahara peak at 122 ka BP, responding to the fast decline in 20 degrees N July insolation. This desertification is accelerated when the magnitude of positive vegetation feedbacks on precipitation cannot offset the moisture deficit due to decreased summer insolation. Simulations including the LIG vegetation feedback suggest warmer conditions than simulations with prescribed pre-industrial vegetation, but they still slightly underestimate the temperature suggested by proxy records. This is particularly the case in the high latitude regions and the tropics, where the 125 ka BP vegetation cover is significantly higher than the pre-industrial state. The magnitude of vegetation feedbacks in North Africa to local climate peaks in the early LIG and decreases during the LIG, corresponding to temporal vegetation changes. During the early LIG, experiments with dynamical vegetation suggested a doubling in the amount of precipitation (similar to 60 cm/yr) in comparison to experiments with fixed pre-industrial vegetation. In addition, adding dynamical vegetation causes higher surface temperatures by about 2.5 degrees C in North Africa. At a global scale, a vegetated Sahara during the early LIG leads to an increase in surface temperature and a decline in surface air pressure due to local feedbacks, thereby enhancing mid-latitude westerlies as a result of increased latitudinal temperature and pressure gradient, leading to an increase in the amount of heat transported by the atmosphere from tropical regions to the Arctic. This green Sahara feedback provides 30% of the total contribution of global vegetation feedbacks to high latitudes warming. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	The last interglacial Vegetation feedbacks Regional and global scales Simulations North Africa
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000589909100007
WOS关键词	ATMOSPHERIC NITROUS-OXIDE ; INTERMEDIATE COMPLEXITY ; TERRESTRIAL BIOSPHERE ; ARABIAN PENINSULA ; GLACIAL-MAXIMUM ; SYSTEM MODEL ; PART I ; MIDHOLOCENE ; SIMULATION ; DYNAMICS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327533
作者单位	[Li, Huan] Nantong Univ, Sch Geog Sci, Tongjingdadao 999, Nantong 226007, Peoples R China; [Li, Huan; Renssen, Hans; Roche, Didier M.] Vrije Univ Amsterdam, Fac Sci Cluster Earth & Climate, Boelelaan 1085, Amsterdam, Netherlands; [Renssen, Hans] Univ South Eastern Norway, Dept Nat Sci & Environm Hlth, Gullbringvegen 36, N-3800 Boi Telemark, Norway; [Roche, Didier M.] Univ Paris Saclay, CEA INSU UVSQ CNRS, LSCE IPSL, Lab Sci Climat & Envirom, Gif Sur Yvette, France
推荐引用方式 GB/T 7714	Li, Huan,Renssen, Hans,Roche, Didier M.. Modeling climate-vegetation interactions during the last interglacial: The impact of biogeophysical feedbacks in North Africa[J],2020,249.
APA	Li, Huan,Renssen, Hans,&Roche, Didier M..(2020).Modeling climate-vegetation interactions during the last interglacial: The impact of biogeophysical feedbacks in North Africa.QUATERNARY SCIENCE REVIEWS,249.
MLA	Li, Huan,et al."Modeling climate-vegetation interactions during the last interglacial: The impact of biogeophysical feedbacks in North Africa".QUATERNARY SCIENCE REVIEWS 249(2020).