Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992
The high nutrient low chlorophyll (HNLC) conditions of the Southern Ocean were explored with an ecological model (SWAMCO) describing the cycling of C, N, P, Si and Fe through different, aggregated, chemical and biological compartments of the plankton ecosystem. The structure of the model was chosen...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/56951 2023-05-15T13:55:32+02:00 Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 Lancelot, Christiane Hannon, Etienne Becquevort, Sylvie Veth, Cornelis De Baar, Hein J W 2000-09-01 2 full-text file(s): application/pdf | application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/56951 https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/1/2000-DSRI-47-1621-1662.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/3/Elsevier_32836.pdf en eng uri/info:doi/10.1016/S0967-0637(00)00005-4 uri/info:scp/0034042292 https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/1/2000-DSRI-47-1621-1662.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/3/Elsevier_32836.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/56951 2 full-text file(s): info:eu-repo/semantics/closedAccess | info:eu-repo/semantics/restrictedAccess Deep-sea research. Part 1. Oceanographic research papers, 47 (9 Ecologie Océanographie biologique Océanographie physique et chimique HNLC SWAMCO modelling biological processes mineralization formation production carbon phytoplankton diatoms nanoflagellates light iron southern ocean info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2000 ftunivbruxelles 2022-06-12T20:41:17Z The high nutrient low chlorophyll (HNLC) conditions of the Southern Ocean were explored with an ecological model (SWAMCO) describing the cycling of C, N, P, Si and Fe through different, aggregated, chemical and biological compartments of the plankton ecosystem. The structure of the model was chosen to take explicitly into account biological processes of importance in the formation and mineralization of carbon biomass in surface waters and in carbon export production. State variables include major inorganic nutrients (NO3, NH4, PO4, Si(OH)4), dissolved Fe, two groups of phytoplankton (diatoms and nanoflagellates), bacteria, heterotrophic nanoflagellates, microzooplankton, labile DOC and two classes of dissolved and particulate organic polymers with specific biodegradability. The model is closed by export production of particulate organic matter out of the surface layer and, when relevant, by metazooplanton, the grazing pressure of which is described as a forcing function. Parameterization was derived from the current knowledge on the kinetics of biological processes in the Southern Ocean and in other 'HNLC' areas. For its application in the Atlantic sector in spring 1992, the SWAMCO model was coupled 'off-line' to a 1D physical model forced by in situ meteorological and sea-ice conditions. The predictions of the model were successfully compared with chemical and biological observations recorded in the Antarctic circumpolar current (ACC) during the 1992 cruise ANTX/6 of RV Polarstern. In particular, the model simulates quite well the diatom bloom and carbon export event observed in the iron-enriched Polar Frontal region and the lack of ice-edge phytoplankton blooms in the marginal zone (MIZ) of the ACC area. Model analysis shows that sufficient light and iron concentrations above 0.5 μmol m-3 are the necessary conditions for enhancing diatom blooms and particulate carbon export production in the Southern Ocean. Low iron availability prevents diatom growth but is still adequate for nanophytoplankton, the biomass of ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic Austral Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Ecologie Océanographie biologique Océanographie physique et chimique HNLC SWAMCO modelling biological processes mineralization formation production carbon phytoplankton diatoms nanoflagellates light iron southern ocean |
spellingShingle |
Ecologie Océanographie biologique Océanographie physique et chimique HNLC SWAMCO modelling biological processes mineralization formation production carbon phytoplankton diatoms nanoflagellates light iron southern ocean Lancelot, Christiane Hannon, Etienne Becquevort, Sylvie Veth, Cornelis De Baar, Hein J W Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 |
topic_facet |
Ecologie Océanographie biologique Océanographie physique et chimique HNLC SWAMCO modelling biological processes mineralization formation production carbon phytoplankton diatoms nanoflagellates light iron southern ocean |
description |
The high nutrient low chlorophyll (HNLC) conditions of the Southern Ocean were explored with an ecological model (SWAMCO) describing the cycling of C, N, P, Si and Fe through different, aggregated, chemical and biological compartments of the plankton ecosystem. The structure of the model was chosen to take explicitly into account biological processes of importance in the formation and mineralization of carbon biomass in surface waters and in carbon export production. State variables include major inorganic nutrients (NO3, NH4, PO4, Si(OH)4), dissolved Fe, two groups of phytoplankton (diatoms and nanoflagellates), bacteria, heterotrophic nanoflagellates, microzooplankton, labile DOC and two classes of dissolved and particulate organic polymers with specific biodegradability. The model is closed by export production of particulate organic matter out of the surface layer and, when relevant, by metazooplanton, the grazing pressure of which is described as a forcing function. Parameterization was derived from the current knowledge on the kinetics of biological processes in the Southern Ocean and in other 'HNLC' areas. For its application in the Atlantic sector in spring 1992, the SWAMCO model was coupled 'off-line' to a 1D physical model forced by in situ meteorological and sea-ice conditions. The predictions of the model were successfully compared with chemical and biological observations recorded in the Antarctic circumpolar current (ACC) during the 1992 cruise ANTX/6 of RV Polarstern. In particular, the model simulates quite well the diatom bloom and carbon export event observed in the iron-enriched Polar Frontal region and the lack of ice-edge phytoplankton blooms in the marginal zone (MIZ) of the ACC area. Model analysis shows that sufficient light and iron concentrations above 0.5 μmol m-3 are the necessary conditions for enhancing diatom blooms and particulate carbon export production in the Southern Ocean. Low iron availability prevents diatom growth but is still adequate for nanophytoplankton, the biomass of ... |
format |
Article in Journal/Newspaper |
author |
Lancelot, Christiane Hannon, Etienne Becquevort, Sylvie Veth, Cornelis De Baar, Hein J W |
author_facet |
Lancelot, Christiane Hannon, Etienne Becquevort, Sylvie Veth, Cornelis De Baar, Hein J W |
author_sort |
Lancelot, Christiane |
title |
Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 |
title_short |
Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 |
title_full |
Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 |
title_fullStr |
Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 |
title_full_unstemmed |
Modeling phytoplankton blooms and carbon export production in the Southern Ocean: dominant controls by light and iron in the Atlantic sector in Austral spring 1992 |
title_sort |
modeling phytoplankton blooms and carbon export production in the southern ocean: dominant controls by light and iron in the atlantic sector in austral spring 1992 |
publishDate |
2000 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/56951 https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/1/2000-DSRI-47-1621-1662.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/3/Elsevier_32836.pdf |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Deep-sea research. Part 1. Oceanographic research papers, 47 (9 |
op_relation |
uri/info:doi/10.1016/S0967-0637(00)00005-4 uri/info:scp/0034042292 https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/1/2000-DSRI-47-1621-1662.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/56951/3/Elsevier_32836.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/56951 |
op_rights |
2 full-text file(s): info:eu-repo/semantics/closedAccess | info:eu-repo/semantics/restrictedAccess |
_version_ |
1766262205380034560 |