An assessment of the quality of aerosol retrievals over the Red Sea and evaluation of the climatological cloud-free dust direct radiative effect in the region

Handle URI:
http://hdl.handle.net/10754/592898
Title:
An assessment of the quality of aerosol retrievals over the Red Sea and evaluation of the climatological cloud-free dust direct radiative effect in the region
Authors:
Brindley, H.; Osipov, Sergey; Bantges, R.; Smirnov, A.; Banks, J.; Levy, R.; Jish Prakash, P.; Stenchikov, Georgiy L. ( 0000-0001-9033-4925 )
Abstract:
Ground-based and satellite observations are used in conjunction with the Rapid Radiative Transfer Model (RRTM) to assess climatological aerosol loading and the associated cloud-free aerosol direct radiative effect (DRE) over the Red Sea. Aerosol optical depth (AOD) retrievals from the Moderate Resolution Imaging Spectroradiometer and Spinning Enhanced Visible and InfraRed Imager (SEVIRI) instruments are first evaluated via comparison with ship-based observations. Correlations are typically better than 0.9 with very small root-mean-square and bias differences. Calculations of the DRE along the ship cruises using RRTM also show good agreement with colocated estimates from the Geostationary Earth Radiation Budget instrument if the aerosol asymmetry parameter is adjusted to account for the presence of large particles. A monthly climatology of AOD over the Red Sea is then created from 5 years of SEVIRI retrievals. This shows enhanced aerosol loading and a distinct north to south gradient across the basin in the summer relative to the winter months. The climatology is used with RRTM to estimate the DRE at the top and bottom of the atmosphere and the atmospheric absorption due to dust aerosol. These climatological estimates indicate that although longwave effects can reach tens of W m−2, shortwave cooling typically dominates the net radiative effect over the Sea, being particularly pronounced in the summer, reaching 120 W m−2 at the surface. The spatial gradient in summertime AOD is reflected in the radiative effect at the surface and in associated differential heating by aerosol within the atmosphere above the Sea. This asymmetric effect is expected to exert a significant influence on the regional atmospheric and oceanic circulation.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
An assessment of the quality of aerosol retrievals over the Red Sea and evaluation of the climatological cloud-free dust direct radiative effect in the region 2015, 120 (20):10,862 Journal of Geophysical Research: Atmospheres
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Atmospheres
Issue Date:
20-Oct-2015
DOI:
10.1002/2015JD023282
Type:
Article
ISSN:
2169897X
Additional Links:
http://doi.wiley.com/10.1002/2015JD023282
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorBrindley, H.en
dc.contributor.authorOsipov, Sergeyen
dc.contributor.authorBantges, R.en
dc.contributor.authorSmirnov, A.en
dc.contributor.authorBanks, J.en
dc.contributor.authorLevy, R.en
dc.contributor.authorJish Prakash, P.en
dc.contributor.authorStenchikov, Georgiy L.en
dc.date.accessioned2016-01-06T06:02:19Zen
dc.date.available2016-01-06T06:02:19Zen
dc.date.issued2015-10-20en
dc.identifier.citationAn assessment of the quality of aerosol retrievals over the Red Sea and evaluation of the climatological cloud-free dust direct radiative effect in the region 2015, 120 (20):10,862 Journal of Geophysical Research: Atmospheresen
dc.identifier.issn2169897Xen
dc.identifier.doi10.1002/2015JD023282en
dc.identifier.urihttp://hdl.handle.net/10754/592898en
dc.description.abstractGround-based and satellite observations are used in conjunction with the Rapid Radiative Transfer Model (RRTM) to assess climatological aerosol loading and the associated cloud-free aerosol direct radiative effect (DRE) over the Red Sea. Aerosol optical depth (AOD) retrievals from the Moderate Resolution Imaging Spectroradiometer and Spinning Enhanced Visible and InfraRed Imager (SEVIRI) instruments are first evaluated via comparison with ship-based observations. Correlations are typically better than 0.9 with very small root-mean-square and bias differences. Calculations of the DRE along the ship cruises using RRTM also show good agreement with colocated estimates from the Geostationary Earth Radiation Budget instrument if the aerosol asymmetry parameter is adjusted to account for the presence of large particles. A monthly climatology of AOD over the Red Sea is then created from 5 years of SEVIRI retrievals. This shows enhanced aerosol loading and a distinct north to south gradient across the basin in the summer relative to the winter months. The climatology is used with RRTM to estimate the DRE at the top and bottom of the atmosphere and the atmospheric absorption due to dust aerosol. These climatological estimates indicate that although longwave effects can reach tens of W m−2, shortwave cooling typically dominates the net radiative effect over the Sea, being particularly pronounced in the summer, reaching 120 W m−2 at the surface. The spatial gradient in summertime AOD is reflected in the radiative effect at the surface and in associated differential heating by aerosol within the atmosphere above the Sea. This asymmetric effect is expected to exert a significant influence on the regional atmospheric and oceanic circulation.en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/2015JD023282en
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproducti on in any medium, provided the original work is properly cited.en
dc.titleAn assessment of the quality of aerosol retrievals over the Red Sea and evaluation of the climatological cloud-free dust direct radiative effect in the regionen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Geophysical Research: Atmospheresen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionSpace and Atmospheric Physics Group, and NERC National Centre for Earth Observation; Imperial College London; London UKen
dc.contributor.institutionSpace and Atmospheric Physics Group, and NERC National Centre for Earth Observation; Imperial College London; London UKen
dc.contributor.institutionSigma Space Corporation; Lanham-Seabrook Maryland USAen
dc.contributor.institutionSpace and Atmospheric Physics Group; Imperial College London; UKen
dc.contributor.institutionNASA-Goddard Space Flight Center; Greenbelt Maryland USAen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorOsipov, Sergeyen
kaust.authorJish Prakash, P.en
kaust.authorStenchikov, Georgiy L.en
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