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Intercomparison of satellite dust retrieval products over the west African Sahara during the Fennec campaign in June 2011

Banks, J.R. and Brindley, H.E. and Flamant, C. and Garay, M.J. and Hsu, N.C. and Kalashnikova, O.V. and Klüser, Lars and Sayer, A.M. (2013) Intercomparison of satellite dust retrieval products over the west African Sahara during the Fennec campaign in June 2011. Remote Sensing of Environment, 136, pp. 99-116. Elsevier. DOI: 10.1016/j.rse.2013.05.003 ISSN 0034-4257

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Official URL: http://www.sciencedirect.com/science/article/pii/S0034425713001478

Abstract

Four aerosol optical depth retrieval algorithms over the Sahara Desert during June 2011 from the IASI, MISR, MODIS, and SEVIRI satellite instruments are compared against each other in order to understand the strengths and weaknesses of each retrieval approach. Particular attention is paid to the effects of meteorological conditions, land surface properties, and the magnitude of the dust loading. The period of study corresponds to the time of the first Fennec intensive measurement campaign, which provides new ground-based and aircraft measurements of the dust characteristics and loading. Validation using ground-based AERONET sunphotometer data indicates that of the satellite products, the SEVIRI retrieval is most able to retrieve dust during optically thick dust events, whereas IASI and MODIS perform better at low dust loadings. This may significantly affect observations of dust emission and the mean dust climatology. MISR and MODIS are least sensitive to variations in meteorological conditions, while SEVIRI tends to overestimate the aerosol optical depth (AOD) under moist conditions (with a bias against AERONET of 0.31), especially at low dust loadings where the AOD < 1. Further comparisons are made with airborne LIDAR measurements taken during the Fennec campaign, which provide further evidence for the inferences made from the AERONET comparisons. The effect of surface properties on the retrievals is also investigated. Over elevated surfaces IASI retrieves AODs which are most consistent with AERONET observations, while the AODs retrieved by MODIS tend to be biased low. In contrast, over the least emissive surfaces IASI significantly underestimates the AOD (with a bias of − 0.41), while MISR and SEVIRI show closest agreement.

Item URL in elib:https://elib.dlr.de/82554/
Document Type:Article
Title:Intercomparison of satellite dust retrieval products over the west African Sahara during the Fennec campaign in June 2011
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Banks, J.R.UNSPECIFIEDUNSPECIFIED
Brindley, H.E.UNSPECIFIEDUNSPECIFIED
Flamant, C.UNSPECIFIEDUNSPECIFIED
Garay, M.J.UNSPECIFIEDUNSPECIFIED
Hsu, N.C.UNSPECIFIEDUNSPECIFIED
Kalashnikova, O.V.UNSPECIFIEDUNSPECIFIED
Klüser, Larslars.klueser (at) dlr.deUNSPECIFIED
Sayer, A.M.UNSPECIFIEDUNSPECIFIED
Date:29 May 2013
Journal or Publication Title:Remote Sensing of Environment
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:136
DOI :10.1016/j.rse.2013.05.003
Page Range:pp. 99-116
Publisher:Elsevier
ISSN:0034-4257
Status:Published
Keywords:Remote sensing of dust Satellite retrieval intercomparison Aerosol optical depth Fennec
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Atmosphere
Deposited By: Klüser, Dr. Lars
Deposited On:02 Jun 2013 20:33
Last Modified:10 Jan 2019 15:50

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