气候变化领域集成服务门户(CCPortal): Mid-Holocene Sahara-Sahel Precipitation From the Vantage of Present-Day Climate

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DOI	10.1029/2020GL088171
	Mid-Holocene Sahara-Sahel Precipitation From the Vantage of Present-Day Climate
	Molnar P.; Rajagopalan B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	To account for the wet mid-Holocene (ca. 6 ka) Sahara-Sahel region, we exploit teleconnections from four large-scale ocean-atmosphere-land forcings: El Niño–Southern Oscillation (ENSO), Atlantic Multidecadal Oscillation (AMO), hemispherical temperature difference, and net energy input at the equator; they offer theoretical bases for estimating effects of large-scale forcing on mid-Holocene Sahara-Sahel rainfall. Together, these forcings explain 16–64% of historical rainfall variability, with the highest percentages in the Sahel region. With estimates for mid-Holocene time, latitudes where rainfall today averages 1,000, 500, or 200 mm/year are reconstructed to have lain ~2.5° farther north. Calculated mid-Holocene rainfall at 15°N, 17.5°N, and 20°N exceeds that today by ~250, 100, and 20 mm/year. These shifts account for more than half of paleoclimatic estimates of mid-Holocene rainfall and are comparable with the General Circulation Model (GCM) runs that match paleorainfall estimates most closely. Mid-Holocene radiation may have affected Sahel precipitation indirectly via teleconnections from oceanic regions. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric pressure; Rain; Atlantic multidecadal oscillations; General circulation model; Hemispherical temperatures; Ocean atmosphere; Oceanic regions; Rainfall variability; Southern oscillation; Teleconnections; Climatology; Atlantic Multidecadal Oscillation; atmosphere-ocean coupling; climate conditions; climate forcing; El Nino-Southern Oscillation; general circulation model; Holocene; precipitation (climatology); rainfall; teleconnection; oceanic regions; Sahara; Sahel [Sub-Saharan Africa]
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169943
作者单位	Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Civil Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Molnar P.,Rajagopalan B.. Mid-Holocene Sahara-Sahel Precipitation From the Vantage of Present-Day Climate[J],2020,47(16).
APA	Molnar P.,&Rajagopalan B..(2020).Mid-Holocene Sahara-Sahel Precipitation From the Vantage of Present-Day Climate.Geophysical Research Letters,47(16).
MLA	Molnar P.,et al."Mid-Holocene Sahara-Sahel Precipitation From the Vantage of Present-Day Climate".Geophysical Research Letters 47.16(2020).