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An improved coastal upwelling index from sea surface temperature using satellite-based approach - The case of the Canary Current upwelling system

AuthorsBenazzouz, Aïssa; Mordane, Soumia; Orbi, A.; Chagdali, Mohamed; Hilmi, Karim; Atillah, Abderrahman; Pelegrí, Josep Lluís ; Demarcq, Hervé
KeywordsCanary upwelling system
Coastal upwelling index
West Africa
Sea surface temperature
Remote sensing
Coastal upwelling
Issue Date15-Jun-2014
PublisherPergamon Press
CitationContinental Shelf Research 81: 38-54 (2014)
AbstractA new methodology to derive an SST-based upwelling index was based on a rigorous spatial analysis of satellite SST fields and their variability, by referring to previous works, from Wooster et al. (1976) to Santos et al. (2011). The data was precautiously processed by considering data quality aspects (including cloud cover) and the best way to derive accurate coastal SST and its offshore reference. The relevance of the developed index was evaluated by comparing its spatial and seasonal consistency against two wind-based indices as well as with the previous SST-based indices, largely superseding these later ones in term of overall quality and spatio-temporal dynamic. Our index adequately describes the spatio-temporal variability of the coastal upwelling intensity in the Canary Current upwelling system and has the advantage of describing complementary aspects of the coastal dynamics of the region that were not covered by Ekman-based indices.The proposed methodology is generic and can be easily applicable to various coastal upwelling systems, especially the four major eastern boundary upwelling ecosystems. © 2014 Elsevier Ltd.
Description17 pages, 16 figures, 3 tables
Publisher version (URL)http://dx.doi.org/10.1016/j.csr.2014.03.012
Identifiersdoi: 10.1016/j.csr.2014.03.012
issn: 0278-4343
e-issn: 1873-6955
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