Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic
The response of phytoplankton to various ecological forcings was examined in the upper waters of the NW Mediterranean (MED) and the subtropical North Atlantic (NA) from field observations, analysis of historical data sets and numerical simulations. Particular emphasis was given to the role played by...
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Other Authors: | , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Universitat Politècnica de Catalunya
2002
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Online Access: | http://hdl.handle.net/2117/93693 http://hdl.handle.net/10803/6381 http://www.tdx.cat/TDX-1205102-113102 https://doi.org/10.5821/dissertation-2117-93693 |
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ftupcatalunyair:oai:upcommons.upc.edu:2117/93693 |
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openpolar |
institution |
Open Polar |
collection |
Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge |
op_collection_id |
ftupcatalunyair |
language |
English |
topic |
Àrees temàtiques de la UPC::Enginyeria civil modelos ecológicos fitoplàncton nitrogeno ecologia del plancton mar Mediterráneo noroccidental 2510. Oceanografia Fitoplàncton -- Atlàntic (Oceà) Fitoplàncton -- Mediterrània Mar |
spellingShingle |
Àrees temàtiques de la UPC::Enginyeria civil modelos ecológicos fitoplàncton nitrogeno ecologia del plancton mar Mediterráneo noroccidental 2510. Oceanografia Fitoplàncton -- Atlàntic (Oceà) Fitoplàncton -- Mediterrània Mar Bahamón Rivera, Nixon Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic |
topic_facet |
Àrees temàtiques de la UPC::Enginyeria civil modelos ecológicos fitoplàncton nitrogeno ecologia del plancton mar Mediterráneo noroccidental 2510. Oceanografia Fitoplàncton -- Atlàntic (Oceà) Fitoplàncton -- Mediterrània Mar |
description |
The response of phytoplankton to various ecological forcings was examined in the upper waters of the NW Mediterranean (MED) and the subtropical North Atlantic (NA) from field observations, analysis of historical data sets and numerical simulations. Particular emphasis was given to the role played by the water column structure in controlling the nitrogen diffusion and new production. Using numerical simulations, the effects of different levels of heating of surface waters and nutrient concentrations in waters below the euphotic zone were examined. Spring microplankton metabolism of surface mixed waters in MED was studied. The system was heterotrophic explained by dark community respiration (DCR) rates higher than gross primary production (GPP) rates. The GPP to DCR ratio was ~0.53, indicating that the system was far from balance between carbon production (photosynthesis) and consumption (respiration), probably caused by organic matter accumulation in the mixed layer favouring respiration over production processes. Summer primary production and nitrogen fluxes in stratified water layers in NA were analysed. The nitrogen flux fuelling new primary production was closely linked to vertical turbulent diffusion at the nitracline rather than at the thermocline. Upward diffused nitrogen inducing new production explaining 21% of total primary production. The vertical turbulent diffusion model used to estimate new production did not explain new production in the Canary Current zone, where laterally advected nutrients from coastal upwelling areas altered the vertical nitrate gradients. A numerical ecological model of the pelagic domain was developed to assess the plankton response to different environmental pressures. The model represents the vertical dimension of the upper and intermediate water layers of the open ocean. A comparative study of the plankton functioning in MED and NA sites was carried out using the model. The nitrate entering the euphotic zone through the lower boundary explained the low but continuous ... |
author2 |
Universitat Politècnica de Catalunya. Departament d'Enginyeria Hidràulica, Marítima i Ambiental Cruzado Alorda, Antonio |
format |
Doctoral or Postdoctoral Thesis |
author |
Bahamón Rivera, Nixon |
author_facet |
Bahamón Rivera, Nixon |
author_sort |
Bahamón Rivera, Nixon |
title |
Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic |
title_short |
Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic |
title_full |
Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic |
title_fullStr |
Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic |
title_full_unstemmed |
Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic |
title_sort |
dynamics of oligotrophic pelagic environments:north western mediterranean sea and subtropical north atlantic |
publisher |
Universitat Politècnica de Catalunya |
publishDate |
2002 |
url |
http://hdl.handle.net/2117/93693 http://hdl.handle.net/10803/6381 http://www.tdx.cat/TDX-1205102-113102 https://doi.org/10.5821/dissertation-2117-93693 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
TDX (Tesis Doctorals en Xarxa) |
op_relation |
Bahamón Rivera, N. Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic. Tesi doctoral, UPC, Departament d'Enginyeria Hidràulica, Marítima i Ambiental, 2002. ISBN 8468807346. DOI 10.5821/dissertation-2117-93693 . 8468807346 http://www.tdx.cat/TDX-1205102-113102 http://hdl.handle.net/2117/93693 doi:10.5821/dissertation-2117-93693 B-4725-2003 http://hdl.handle.net/10803/6381 |
op_rights |
ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs. Open Access |
op_doi |
https://doi.org/10.5821/dissertation-2117-93693 |
_version_ |
1809927661935394816 |
spelling |
ftupcatalunyair:oai:upcommons.upc.edu:2117/93693 2024-09-09T19:56:49+00:00 Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic Bahamón Rivera, Nixon Universitat Politècnica de Catalunya. Departament d'Enginyeria Hidràulica, Marítima i Ambiental Cruzado Alorda, Antonio 2002-05-24 application/pdf http://hdl.handle.net/2117/93693 http://hdl.handle.net/10803/6381 http://www.tdx.cat/TDX-1205102-113102 https://doi.org/10.5821/dissertation-2117-93693 eng eng Universitat Politècnica de Catalunya Bahamón Rivera, N. Dynamics of oligotrophic pelagic environments:North western Mediterranean sea and subtropical north Atlantic. Tesi doctoral, UPC, Departament d'Enginyeria Hidràulica, Marítima i Ambiental, 2002. ISBN 8468807346. DOI 10.5821/dissertation-2117-93693 . 8468807346 http://www.tdx.cat/TDX-1205102-113102 http://hdl.handle.net/2117/93693 doi:10.5821/dissertation-2117-93693 B-4725-2003 http://hdl.handle.net/10803/6381 ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs. Open Access TDX (Tesis Doctorals en Xarxa) Àrees temàtiques de la UPC::Enginyeria civil modelos ecológicos fitoplàncton nitrogeno ecologia del plancton mar Mediterráneo noroccidental 2510. Oceanografia Fitoplàncton -- Atlàntic (Oceà) Fitoplàncton -- Mediterrània Mar Doctoral thesis 2002 ftupcatalunyair https://doi.org/10.5821/dissertation-2117-93693 2024-07-25T10:52:14Z The response of phytoplankton to various ecological forcings was examined in the upper waters of the NW Mediterranean (MED) and the subtropical North Atlantic (NA) from field observations, analysis of historical data sets and numerical simulations. Particular emphasis was given to the role played by the water column structure in controlling the nitrogen diffusion and new production. Using numerical simulations, the effects of different levels of heating of surface waters and nutrient concentrations in waters below the euphotic zone were examined. Spring microplankton metabolism of surface mixed waters in MED was studied. The system was heterotrophic explained by dark community respiration (DCR) rates higher than gross primary production (GPP) rates. The GPP to DCR ratio was ~0.53, indicating that the system was far from balance between carbon production (photosynthesis) and consumption (respiration), probably caused by organic matter accumulation in the mixed layer favouring respiration over production processes. Summer primary production and nitrogen fluxes in stratified water layers in NA were analysed. The nitrogen flux fuelling new primary production was closely linked to vertical turbulent diffusion at the nitracline rather than at the thermocline. Upward diffused nitrogen inducing new production explaining 21% of total primary production. The vertical turbulent diffusion model used to estimate new production did not explain new production in the Canary Current zone, where laterally advected nutrients from coastal upwelling areas altered the vertical nitrate gradients. A numerical ecological model of the pelagic domain was developed to assess the plankton response to different environmental pressures. The model represents the vertical dimension of the upper and intermediate water layers of the open ocean. A comparative study of the plankton functioning in MED and NA sites was carried out using the model. The nitrate entering the euphotic zone through the lower boundary explained the low but continuous ... Doctoral or Postdoctoral Thesis North Atlantic Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge |