Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic
22 páginas, 15 figuras, 3 tablas Stocks 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 Catala...
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Online Access: | http://hdl.handle.net/10261/136190 https://doi.org/10.1016/S0304-3800(03)00007-3 |
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ftcsic:oai:digital.csic.es:10261/136190 2024-02-11T10:07:04+01:00 Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic Cruzado, Antonio Bahamon, Nixon 2003 http://hdl.handle.net/10261/136190 https://doi.org/10.1016/S0304-3800(03)00007-3 en eng Elsevier http://dx.doi.org/10.1016/S0304-3800(03)00007-3 Sí Ecological Modelling 163 : 223-244 (2003) 0304-3800 http://hdl.handle.net/10261/136190 doi:10.1016/S0304-3800(03)00007-3 none Oligotrophic ecosystems Comparative ecology Nitrogen Ecological modelling artículo http://purl.org/coar/resource_type/c_6501 2003 ftcsic https://doi.org/10.1016/S0304-3800(03)00007-3 2024-01-16T10:17:10Z 22 páginas, 15 figuras, 3 tablas Stocks 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. This work was partly funded by the European Commission through project MFSPP: Mediterranean Forecasting System, Pilot Project (MAS3-CT98-0171). The Spanish Agency for International Co-operation provided partial financial support for N.B. Peer reviewed Article in Journal/Newspaper Northeast Atlantic Digital.CSIC (Spanish National Research Council) Ecological Modelling 163 3 223 244 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Oligotrophic ecosystems Comparative ecology Nitrogen Ecological modelling |
spellingShingle |
Oligotrophic ecosystems Comparative ecology Nitrogen Ecological modelling Cruzado, Antonio Bahamon, Nixon Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic |
topic_facet |
Oligotrophic ecosystems Comparative ecology Nitrogen Ecological modelling |
description |
22 páginas, 15 figuras, 3 tablas Stocks 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. This work was partly funded by the European Commission through project MFSPP: Mediterranean Forecasting System, Pilot Project (MAS3-CT98-0171). The Spanish Agency for International Co-operation provided partial financial support for N.B. Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Cruzado, Antonio Bahamon, Nixon |
author_facet |
Cruzado, Antonio Bahamon, Nixon |
author_sort |
Cruzado, Antonio |
title |
Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic |
title_short |
Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic |
title_full |
Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic |
title_fullStr |
Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic |
title_full_unstemmed |
Modelling nitrogen fluxes in oligotrophic environments: NW Mediterranean and NE Atlantic |
title_sort |
modelling nitrogen fluxes in oligotrophic environments: nw mediterranean and ne atlantic |
publisher |
Elsevier |
publishDate |
2003 |
url |
http://hdl.handle.net/10261/136190 https://doi.org/10.1016/S0304-3800(03)00007-3 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
http://dx.doi.org/10.1016/S0304-3800(03)00007-3 Sí Ecological Modelling 163 : 223-244 (2003) 0304-3800 http://hdl.handle.net/10261/136190 doi:10.1016/S0304-3800(03)00007-3 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/S0304-3800(03)00007-3 |
container_title |
Ecological Modelling |
container_volume |
163 |
container_issue |
3 |
container_start_page |
223 |
op_container_end_page |
244 |
_version_ |
1790605194649665536 |