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DOI	10.1073/pnas.1917673117
	African climate response to orbital and glacial forcing in 140,000-y simulation with implications for early modern human environments
	Kutzbach, John E.1; Guan, Jian 2; He, Feng 1; Cohen, Andrew S.3; Orland, Ian J.4,5; Chen, Guangshan 4
通讯作者	Kutzbach, John E.
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN	0027-8424
出版年	2020
卷号	117 期号:5 页码:2255-2264
英文摘要	A climate/vegetation model simulates episodic wetter and drier periods at the 21,000-y precession period in eastern North Africa, the Arabian Peninsula, and the Levant over the past 140,000 y. Large orbitally forced wet/dry extremes occur during interglacial time, similar to 130 to 80 ka, and conditions between these two extremes prevail during glacial time, similar to 70 to 15 ka. Orbital precession causes high seasonality in Northern Hemisphere (NH) insolation at similar to 125, 105, and 83 ka, with stronger and northward extended summer monsoon rains in North Africa and the Arabian Peninsula and increased winter rains in the Mediterranean Basin. The combined effects of these two seasonally distinct rainfall regimes increase vegetation and narrow the width of the Saharan-Arabian desert and semidesert zones. During the opposite phase of the precession cycle (similar to 115, 95, and 73 ka), NH seasonality is low, and decreased summer insolation and increased winter insolation cause monsoon and storm track rains to decrease and the width of the desert zone to increase. During glacial time (similar to 70 to 15 ka), forcing from large ice sheets and lowered greenhouse gas concentrations combine to increase winter Mediterranean storm track precipitation; the southward retreat of the northern limit of summer monsoon rains is relatively small, thereby limiting the expansion of deserts. The lowered greenhouse gas concentrations cause the near-equatorial zone to cool and reduce convection, causing drier climate with reduced forest cover. At most locations and times, the simulations agree with environmental observations. These changing regional patterns of climate/vegetation could have influenced the dispersal of early humans through expansions and contractions of well-watered corridors.
英文关键词	paleoclimate Africa climate modeling glacial and orbital forcing human dispersal
类型	Article
语种	英语
国家	USA ; Peoples R China
开放获取类型	Green Published, Bronze
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000512340900011
WOS关键词	LAKE LISAN ; LAST ; VEGETATION ; SEA ; VARIABILITY ; MAXIMUM ; CIRCULATION ; SENSITIVITY ; RESOLUTION ; CONTEXT
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	北京大学 ; University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315365
作者单位	1.Univ Wisconsin, Ctr Climat Res, Nelson Inst Environm Sci, Madison, WI 53706 USA; 2.Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Beijing 100871, Peoples R China; 3.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; 4.Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA; 5.Univ Wisconsin, Wisconsin Geol & Nat Hist Survey, Madison, WI 53705 USA
推荐引用方式 GB/T 7714	Kutzbach, John E.,Guan, Jian,He, Feng,et al. African climate response to orbital and glacial forcing in 140,000-y simulation with implications for early modern human environments[J]. 北京大学, University of Arizona,2020,117(5):2255-2264.
APA	Kutzbach, John E.,Guan, Jian,He, Feng,Cohen, Andrew S.,Orland, Ian J.,&Chen, Guangshan.(2020).African climate response to orbital and glacial forcing in 140,000-y simulation with implications for early modern human environments.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(5),2255-2264.
MLA	Kutzbach, John E.,et al."African climate response to orbital and glacial forcing in 140,000-y simulation with implications for early modern human environments".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.5(2020):2255-2264.