Role of dust direct radiative effect on the tropical rainbelt over Middle East and North Africa: A high resolution AGCM study

Handle URI:
http://hdl.handle.net/10754/551009
Title:
Role of dust direct radiative effect on the tropical rainbelt over Middle East and North Africa: A high resolution AGCM study
Authors:
Bangalath, Hamza Kunhu ( 0000-0003-1844-8236 ) ; Stenchikov, Georgiy L. ( 0000-0001-9033-4925 )
Abstract:
To investigate the influence of direct radiative effect of dust on the tropical summer rainbelt across the Middle East and North Africa (MENA), the present study utilizes the high resolution capability of an Atmospheric General Circulation Model (AGCM),the High Resolution Atmospheric Model (HiRAM). Ensembles of Atmospheric Model Inter-comparison Project (AMIP)-style simulations have been conducted with and without dust radiative impacts, to differentiate the influence of dust on the tropical rainbelt. The analysis focuses on summer season. The results highlight the role of dust induced responses in global and regional scale circulations in determining the strength and the latitudinal extent of the tropical rainbelt. A significant response in the strength and position of the local Hadley circulation is predicted in response to meridionally asymmetric distribution of dust and the corresponding radiative effects. Significant responses are also found in regional circulation features such as African Easterly Jet (AEJ) and West African Monsoon (WAM) circulation. Consistent with these dynamic responses at various scales, the tropical rainbelt across MENA strengthens and shifts northward. Importantly, the summer precipitation over the semi-arid strip south of Sahara, including Sahel, increases up to 20%. As this region is characterized by the “Sahel drought" , the predicted precipitation sensitivity to the dust loading over this region has a wide-range of socioeconomic implications. Overall, the study demonstrates the extreme importance of incorporating dust radiative effects and the corresponding circulation responses at various scales, in the simulations and future projections of this region's climate.
KAUST Department:
Earth Science and Engineering Program
Citation:
Role of dust direct radiative effect on the tropical rainbelt over Middle East and North Africa: A high resolution AGCM study 2015:n/a Journal of Geophysical Research: Atmospheres
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Atmospheres
Issue Date:
25-Apr-2015
DOI:
10.1002/2015JD023122
Type:
Article
ISSN:
2169897X
Additional Links:
http://doi.wiley.com/10.1002/2015JD023122
Appears in Collections:
Articles; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorBangalath, Hamza Kunhuen
dc.contributor.authorStenchikov, Georgiy L.en
dc.date.accessioned2015-04-30T12:08:02Zen
dc.date.available2015-04-30T12:08:02Zen
dc.date.issued2015-04-25en
dc.identifier.citationRole of dust direct radiative effect on the tropical rainbelt over Middle East and North Africa: A high resolution AGCM study 2015:n/a Journal of Geophysical Research: Atmospheresen
dc.identifier.issn2169897Xen
dc.identifier.doi10.1002/2015JD023122en
dc.identifier.urihttp://hdl.handle.net/10754/551009en
dc.description.abstractTo investigate the influence of direct radiative effect of dust on the tropical summer rainbelt across the Middle East and North Africa (MENA), the present study utilizes the high resolution capability of an Atmospheric General Circulation Model (AGCM),the High Resolution Atmospheric Model (HiRAM). Ensembles of Atmospheric Model Inter-comparison Project (AMIP)-style simulations have been conducted with and without dust radiative impacts, to differentiate the influence of dust on the tropical rainbelt. The analysis focuses on summer season. The results highlight the role of dust induced responses in global and regional scale circulations in determining the strength and the latitudinal extent of the tropical rainbelt. A significant response in the strength and position of the local Hadley circulation is predicted in response to meridionally asymmetric distribution of dust and the corresponding radiative effects. Significant responses are also found in regional circulation features such as African Easterly Jet (AEJ) and West African Monsoon (WAM) circulation. Consistent with these dynamic responses at various scales, the tropical rainbelt across MENA strengthens and shifts northward. Importantly, the summer precipitation over the semi-arid strip south of Sahara, including Sahel, increases up to 20%. As this region is characterized by the “Sahel drought" , the predicted precipitation sensitivity to the dust loading over this region has a wide-range of socioeconomic implications. Overall, the study demonstrates the extreme importance of incorporating dust radiative effects and the corresponding circulation responses at various scales, in the simulations and future projections of this region's climate.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/2015JD023122en
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distri- bution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.titleRole of dust direct radiative effect on the tropical rainbelt over Middle East and North Africa: A high resolution AGCM studyen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalJournal of Geophysical Research: Atmospheresen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorBangalath, Hamza Kunhuen
kaust.authorStenchikov, Georgiy L.en
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