globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1917673117
论文题名:
African climate response to orbital and glacial forcing in 140;000-y simulation with implications for early modern human environments
作者: Kutzbach J.E.; Guan J.; He F.; Cohen A.S.; Orland I.J.; Chen G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:5
起始页码: 2255
结束页码: 2264
语种: 英语
英文关键词: Africa ; Climate modeling ; Glacial and orbital forcing ; Human dispersal ; Paleoclimate
Scopus关键词: rain ; African ; Article ; climate change ; controlled study ; desert ; environmental factor ; glacial period ; greenhouse gas ; human ; ice sheet ; monsoon climate ; Northern Hemisphere ; precipitation ; priority journal ; process model ; seasonal variation ; vegetation ; Africa ; animal ; climate ; computer simulation ; hominid ; ice cover ; paleontology ; plant ; season ; Africa ; Animals ; Climate ; Climate Change ; Computer Simulation ; Earth, Planet ; Greenhouse Gases ; Hominidae ; Humans ; Ice Cover ; Paleontology ; Plants ; Rain ; Seasons
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, ∼130 to 80 ka, and conditions between these two extremes prevail during glacial time, ∼70 to 15 ka. Orbital precession causes high seasonality in Northern Hemisphere (NH) insolation at ∼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 (∼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 (∼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. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164334
Appears in Collections:气候变化与战略

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作者单位: Kutzbach, J.E., Center for Climatic Research, Nelson Institute for Environmental Science, University of Wisconsin–Madison, Madison, WI 53706, United States; Guan, J., Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China; He, F., Center for Climatic Research, Nelson Institute for Environmental Science, University of Wisconsin–Madison, Madison, WI 53706, United States; Cohen, A.S., Department of Geosciences, University of Arizona, Tucson, AZ 85721, United States; Orland, I.J., Department of Geoscience, University of Wisconsin–Madison, Madison, WI 53706, United States, Wisconsin Geological and Natural History Survey, University of Wisconsin–Madison, Madison, WI 53705, United States; Chen, G., Department of Geoscience, University of Wisconsin–Madison, Madison, WI 53706, United States

Recommended Citation:
Kutzbach J.E.,Guan J.,He F.,et al. African climate response to orbital and glacial forcing in 140;000-y simulation with implications for early modern human environments[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(5)
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