English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/116367
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

The reduction of plankton biomass induced by mesoscale stirring: A modeling study in the Benguela upwelling

AuthorsHernández Carrasco, Ismael ; Rossi, Vincent ; Hernández-García, Emilio ; Garçon, Véronique; López, Cristóbal
KeywordsPrimary production
Plankton dynamics
Benguela upwelling system
Horizontal stirring
FSLE
Issue DateJan-2014
PublisherElsevier
CitationDeep-Sea Research Part I: Oceanographic Research Papers 83: 65-80 (2014)
AbstractRecent studies, both based on remote sensed data and coupled models, showed a reduction of biological productivity due to vigorous horizontal stirring in upwelling areas. In order to better understand this phenomenon, we consider a system of oceanic flow from the Benguela area coupled with a simple biogeochemical model of Nutrient-Phyto-Zooplankton (NPZ) type. For the flow three different surface velocity fields are considered: one derived from satellite altimetry data, and the other two from a regional numerical model at two different spatial resolutions. We compute horizontal particle dispersion in terms of Lyapunov exponents, and analyzed their correlations with phytoplankton concentrations. Our modeling approach confirms that in the south Benguela there is a reduction of biological activity when stirring is increased. Two-dimensional offshore advection and latitudinal difference in primary production, also mediated by the flow, seem to be the dominant processes involved. We estimate that mesoscale processes are responsible for 30-50% of the offshore fluxes of biological tracers. In the northern area, other factors not taken into account in our simulation are influencing the ecosystem. We suggest explanations for these results in the context of studies performed in other eastern boundary upwelling areas. © 2013 Elsevier Ltd.
Publisher version (URL)http://dx.doi.org/10.1016/j.dsr.2013.09.003
URIhttp://hdl.handle.net/10261/116367
DOI10.1016/j.dsr.2013.09.003
Identifiersdoi: 10.1016/j.dsr.2013.09.003
issn: 0967-0637
Appears in Collections:(IFISC) Artículos
Files in This Item:
File Description SizeFormat 
reduction_plankton_biomass_Hernandez.pdf1,87 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.