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Title: Projected changes in the terrestrial and oceanic regulators of climate variability across sub-Saharan Africa

Abstract

Future changes in the sign and intensity of ocean–land–atmosphere interactions have been insufficiently studied, despite implications for regional climate change projections, extreme event statistics, and seasonal climate predictability. In response to this deficiency, the present study focuses on projected responses to the enhanced greenhouse effect in: (1) the mean state of the atmosphere and land surface; (2) oceanic and terrestrial drivers of sub-Saharan climate variability; and (3) total seasonal climate predictability of sub-Saharan Africa, a region known for its pronounced land–atmosphere coupling. Analysis focuses on output from 23 Earth System Models in the Coupled Model Intercomparison Project Phase Five for the late twentieth and twenty-first centuries. It is projected that the greatest warming across sub-Saharan Africa will occur over the Sahel, the monsoon season will become more persistent into late summer and autumn, short rains in the Horn of Africa (HOA) will intensify, and leaf area index will increase across the HOA. Stepwise Generalized Equilibrium Feedback Assessment, i.e. a multivariate statistical approach, is applied to the model output over sub-Saharan Africa in order to explore the oceanic and terrestrial drivers of regional climate. The models indicate that the study region’s climate variability is dominated by oceanic drivers, with secondary contributionsmore » from soil moisture and very modest impacts from vegetation. Overall, the general model consensus of future projections indicates a concerning diminished seasonal predictability of sub-Saharan African regional climate based on key oceanic and terrestrial predictors and an elevated role of the land surface (associated with soil moisture anomalies) compared to oceanic drivers in regulating regional climate variability.« less

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [3]
  1. Univ. of Wisconsin, Madison, WI (United States). Nelson Inst. Center for Climatic Research
  2. Princeton Univ., NJ (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1632064
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Climate Dynamics
Additional Journal Information:
Journal Volume: 55; Journal Issue: 5-6; Journal ID: ISSN 0930-7575
Publisher:
Springer-Verlag
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Notaro, Michael, Wang, Fuyao, Yu, Yan, and Mao, Jiafu. Projected changes in the terrestrial and oceanic regulators of climate variability across sub-Saharan Africa. United States: N. p., 2020. Web. doi:10.1007/s00382-020-05308-0.
Notaro, Michael, Wang, Fuyao, Yu, Yan, & Mao, Jiafu. Projected changes in the terrestrial and oceanic regulators of climate variability across sub-Saharan Africa. United States. https://doi.org/10.1007/s00382-020-05308-0
Notaro, Michael, Wang, Fuyao, Yu, Yan, and Mao, Jiafu. Wed . "Projected changes in the terrestrial and oceanic regulators of climate variability across sub-Saharan Africa". United States. https://doi.org/10.1007/s00382-020-05308-0. https://www.osti.gov/servlets/purl/1632064.
@article{osti_1632064,
title = {Projected changes in the terrestrial and oceanic regulators of climate variability across sub-Saharan Africa},
author = {Notaro, Michael and Wang, Fuyao and Yu, Yan and Mao, Jiafu},
abstractNote = {Future changes in the sign and intensity of ocean–land–atmosphere interactions have been insufficiently studied, despite implications for regional climate change projections, extreme event statistics, and seasonal climate predictability. In response to this deficiency, the present study focuses on projected responses to the enhanced greenhouse effect in: (1) the mean state of the atmosphere and land surface; (2) oceanic and terrestrial drivers of sub-Saharan climate variability; and (3) total seasonal climate predictability of sub-Saharan Africa, a region known for its pronounced land–atmosphere coupling. Analysis focuses on output from 23 Earth System Models in the Coupled Model Intercomparison Project Phase Five for the late twentieth and twenty-first centuries. It is projected that the greatest warming across sub-Saharan Africa will occur over the Sahel, the monsoon season will become more persistent into late summer and autumn, short rains in the Horn of Africa (HOA) will intensify, and leaf area index will increase across the HOA. Stepwise Generalized Equilibrium Feedback Assessment, i.e. a multivariate statistical approach, is applied to the model output over sub-Saharan Africa in order to explore the oceanic and terrestrial drivers of regional climate. The models indicate that the study region’s climate variability is dominated by oceanic drivers, with secondary contributions from soil moisture and very modest impacts from vegetation. Overall, the general model consensus of future projections indicates a concerning diminished seasonal predictability of sub-Saharan African regional climate based on key oceanic and terrestrial predictors and an elevated role of the land surface (associated with soil moisture anomalies) compared to oceanic drivers in regulating regional climate variability.},
doi = {10.1007/s00382-020-05308-0},
journal = {Climate Dynamics},
number = 5-6,
volume = 55,
place = {United States},
year = {Wed Jun 03 00:00:00 EDT 2020},
month = {Wed Jun 03 00:00:00 EDT 2020}
}

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