The influence of remote aerosol forcing from industrialized economies on the future evolution of East and West African rainfall
File(s)jcli-d-18-0716.1.pdf (3.16 MB)
Published version
Author(s)
Type
Journal Article
Abstract
Past changes in global industrial aerosol emissions have played a significant role in historical shifts in African rainfall, and yet assessment of the impact on African rainfall of near-term (10–40 yr) potential aerosol emission pathways remains largely unexplored. While existing literature links future aerosol declines to a northward shift of Sahel rainfall, existing climate projections rely on RCP scenarios that do not explore the range of air quality drivers. Here we present projections from two emission scenarios that better envelop the range of potential aerosol emissions. More aggressive emission cuts result in northward shifts of the tropical rainbands whose signal can emerge from expected internal variability on short, 10–20-yr time horizons. We also show for the first time that this northward shift also impacts East Africa, with evidence of delays to both onset and withdrawal of the short rains. However, comparisons of rainfall impacts across models suggest that only certain aspects of both the West and East African model responses may be robust, given model uncertainties. This work motivates the need for wider exploration of air quality scenarios in the climate science community to assess the robustness of these projected changes and to provide evidence to underpin climate adaptation in Africa. In particular, revised estimates of emission impacts of legislated measures every 5–10 years would have a value in providing near-term climate adaptation information for African stakeholders.
Date Issued
2019-12-01
Date Acceptance
2019-11-01
Citation
Journal of Climate, 2019, 32 (23), pp.8335-8354
ISSN
0894-8755
Publisher
American Meteorological Society
Start Page
8335
End Page
8354
Journal / Book Title
Journal of Climate
Volume
32
Issue
23
Copyright Statement
© 2019 American Meteorological Society.This article is licensed under a Creative Commons
Attribution 4.0 license (http://creativecommons.org/
licenses/by/4.0/).
Attribution 4.0 license (http://creativecommons.org/
licenses/by/4.0/).
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000496297700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Meteorology & Atmospheric Sciences
Atmosphere
Africa
Precipitation
Aerosols
Climate models
Climate variability
SULFUR-DIOXIDE
SAHEL RAINFALL
CLIMATE
MODEL
EMISSIONS
TRENDS
PRECIPITATION
IMPACTS
CHINA
UNCERTAINTY
Publication Status
Published
OA Location
https://journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-18-0716.1
Date Publish Online
2019-11-12