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Mid‐Holocene Sahara‐Sahel Precipitation From the Vantage of Present‐Day Climate
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2020
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Source: Geophysical Research Letters, 47(16)
[PDF-1.72 MB]
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Journal Title:Geophysical Research Letters
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Description: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
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Source:Geophysical Research Letters, 47(16)
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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