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Impact of High Concentrations of Saharan Dust Aerosols on Infrared-Based Land Surface Temperature Products

Stante, Francesco; Ermida, Sofia L.; DaCamara, Carlos C.; Göttsche, Frank-Michael ORCID iD icon 1; Trigo, Isabel F.
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)


An analysis of three operational satellite-based thermal-infrared land surface temperature (LST) products is presented for conditions of heavy dust aerosol loading. The LST products are compared against ERA5’s skin temperature (SKT) across the Sahara Desert and Sahel region, where high concentrations of dust aerosols are prevalent. Large anomalous differences are found between satellite LST and ERA5’s SKT during the periods of highest dust activity, and satellite–ERA5 differences are shown to be strongly related to dust aerosol optical depth (DuAOD) at 550 nm, indicating an underestimation of LST in conditions of heavy dust aerosol loading. In situ measurements from two ground stations in the Sahel region provide additional evidence of this underestimation, showing increased biases of satellite LST with DuAOD, and no significant dependence of ERA5’s SKT biases on dust aerosol concentrations. The impact of atmospheric water vapor content on LST and SKT is also examined, but dust aerosols are shown to be the primary driver of the inaccurate LSTs observed. Based on comparisons with in situ data, we estimate an aerosol-induced underestimation of LST of approximately 0.9 K for every 0.1 increase in DuAOD. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000158488
Veröffentlicht am 10.05.2023
DOI: 10.1109/JSTARS.2023.3263374
Zitationen: 1
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1939-1404, 2151-1535
KITopen-ID: 1000158488
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Erschienen in IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Band 16
Seiten 4064–4079
Nachgewiesen in Scopus
Web of Science
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