English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/136190
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

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


Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic

AuthorsCruzado, Antonio ; Bahamon, Nixon
KeywordsOligotrophic ecosystems
Comparative ecology
Ecological modelling
Issue Date2003
CitationEcological Modelling 163 : 223-244 (2003)
AbstractStocks and fluxes of nitrogen in two oligotrophic ecosystems are evaluated using a vertically resolved turbulence-driven ecological model. The model simulates the intra-annual variability of the ecological processes in the upper 300m of the water column in the Catalan Sea (CS), northwestern Mediterranean, and in the subtropical northeast Atlantic (NEA). Higher irradiance and daylight length making the euphotic layer thicker, together with a higher mixing layer depth explained that the phytoplankton maximum was deeper in NEA than in CS during summertime. In general, the amount of irradiance appears to control the chlorophyll maximum depth while the amount of nitrate transported from the bottom boundary is mainly constraining the phytoplankton stocks. The summer chlorophyll maximum was found at depths below the thermocline and close to the nitracline. In both locations, zooplankton grazing controlled the late winter phytoplankton bloom but reduced more than expected the subsurface phytoplankton concentration in summer. The nitritemaximumwas successfully simulated to be close to the chlorophyll maximum, explained by the phytoplankton reduction of nitrate in the dark. The yearly estimates of upward fluxes of nitrate to the euphotic zone were variable depending on the horizon at which fluxes were computed. Just below the euphotic zone, the upward fluxes of nitrate were 0.64 and 0.22 molNm−2 in the CS and NEA, respectively, more closely connected to the variation of the nitrogen gradient than to the density field.
Description22 páginas, 15 figuras, 3 tablas
Publisher version (URL)http://dx.doi.org/10.1016/S0304-3800(03)00007-3
Appears in Collections:(CEAB) Artículos
Files in This Item:
File Description SizeFormat 
Restringido.pdf15,38 kBAdobe PDFThumbnail
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.