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Title: Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation

Abstract

During the last deglaciation, wetter conditions developed abruptly ~14,700 years ago in southeastern equatorial and northern Africa and continued into the Holocene. Explaining the abrupt onset and hemispheric coherence of this early African Humid Period is challenging due to opposing seasonal insolation patterns. In this work, we use a transient simulation with a climate model that provides a mechanistic understanding of deglacial tropical African precipitation changes. Our results show that meltwater-induced reduction in the Atlantic meridional overturning circulation (AMOC) during the early deglaciation suppressed precipitation in both regions. Once the AMOC reestablished, wetter conditions developed north of the equator in response to high summer insolation and increasing greenhouse gas (GHG) concentrations, whereas wetter conditions south of the equator were a response primarily to the GHG increase.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge Leadership Computing Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565381
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 346; Journal Issue: 6214; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics

Citation Formats

Otto-Bliesner, Bette L., Russell, James M., Clark, Peter U., Liu, Zhengyu, Overpeck, Jonathan T., Konecky, Bronwen, deMenocal, Peter, Nicholson, Sharon E., He, Feng, and Lu, Zhengyao. Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation. United States: N. p., 2014. Web. doi:10.1126/science.1259531.
Otto-Bliesner, Bette L., Russell, James M., Clark, Peter U., Liu, Zhengyu, Overpeck, Jonathan T., Konecky, Bronwen, deMenocal, Peter, Nicholson, Sharon E., He, Feng, & Lu, Zhengyao. Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation. United States. doi:10.1126/science.1259531.
Otto-Bliesner, Bette L., Russell, James M., Clark, Peter U., Liu, Zhengyu, Overpeck, Jonathan T., Konecky, Bronwen, deMenocal, Peter, Nicholson, Sharon E., He, Feng, and Lu, Zhengyao. Thu . "Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation". United States. doi:10.1126/science.1259531.
@article{osti_1565381,
title = {Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation},
author = {Otto-Bliesner, Bette L. and Russell, James M. and Clark, Peter U. and Liu, Zhengyu and Overpeck, Jonathan T. and Konecky, Bronwen and deMenocal, Peter and Nicholson, Sharon E. and He, Feng and Lu, Zhengyao},
abstractNote = {During the last deglaciation, wetter conditions developed abruptly ~14,700 years ago in southeastern equatorial and northern Africa and continued into the Holocene. Explaining the abrupt onset and hemispheric coherence of this early African Humid Period is challenging due to opposing seasonal insolation patterns. In this work, we use a transient simulation with a climate model that provides a mechanistic understanding of deglacial tropical African precipitation changes. Our results show that meltwater-induced reduction in the Atlantic meridional overturning circulation (AMOC) during the early deglaciation suppressed precipitation in both regions. Once the AMOC reestablished, wetter conditions developed north of the equator in response to high summer insolation and increasing greenhouse gas (GHG) concentrations, whereas wetter conditions south of the equator were a response primarily to the GHG increase.},
doi = {10.1126/science.1259531},
journal = {Science},
issn = {0036-8075},
number = 6214,
volume = 346,
place = {United States},
year = {2014},
month = {12}
}

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