Mid‐Holocene Sahara‐Sahel Precipitation From the Vantage of Present‐Day Climate

Molnar, Peter; Rajagopalan, Balaji

doi:10.1029/2020gl088171

i

Mid‐Holocene Sahara‐Sahel Precipitation From the Vantage of Present‐Day Climate

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2020
By Molnar, Peter ; Rajagopalan, Balaji

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Journal Title:

Geophysical Research Letters
Personal Author:

Molnar, Peter ; Rajagopalan, Balaji
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences)
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
Keywords:

General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
Source:

Geophysical Research Letters, 47(16)
DOI:

https://doi.org/10.1029/2020gl088171
ISSN:

0094-8276 ; 1944-8007
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Rights Information:

Other
Compliance:

Library
Main Document Checksum:

urn:sha256:bc4a2cf9c73aff7fa69fff0f3b4d630db1d61ec680191050dbe24399e1659c1d
Download URL:

https://repository.library.noaa.gov/view/noaa/54123/noaa_54123_DS1.pdf
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[PDF - 1.72 MB ]

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