Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6
The R.V. Polarstern cruise ANT X/6, part of the international Southern Ocean JGOFS programme, investigated phytoplankton spring bloom development and its biogeochemical effects in different water masses of the Atlantic sector of the Southern Ocean: the Polar Frontal region (PFr), the southern Antarc...
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Format: | Other/Unknown Material |
Language: | English |
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PANGAEA
1997
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.728865 https://doi.org/10.1594/PANGAEA.728865 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.728865 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-X/6 AWI_BioOce Biological Oceanography @ AWI CT CTD/Rosette CTD-RO DIVERSE Giant water sampler GWS JGOFS Joint Global Ocean Flux Study MUC MultiCorer Polarstern PS22 PS22/6-track PS22/856C1 PS22/857 PS22/857C1 PS22/858C1 PS22/858C2 PS22/859 PS22/859C1 PS22/859C2 PS22/860 PS22/860C1 PS22/860C2 PS22/860C3 PS22/861C1 PS22/861C2 PS22/862 PS22/862C1 PS22/862C2 PS22/863C1 PS22/864 PS22/864C1 PS22/865 PS22/865C1 PS22/865CA1 PS22/866 PS22/866C1 PS22/866C2 PS22/866C3 PS22/866C4 PS22/866C5 PS22/867 PS22/867C1 PS22/868 PS22/868C1 PS22/868C2 |
spellingShingle |
ANT-X/6 AWI_BioOce Biological Oceanography @ AWI CT CTD/Rosette CTD-RO DIVERSE Giant water sampler GWS JGOFS Joint Global Ocean Flux Study MUC MultiCorer Polarstern PS22 PS22/6-track PS22/856C1 PS22/857 PS22/857C1 PS22/858C1 PS22/858C2 PS22/859 PS22/859C1 PS22/859C2 PS22/860 PS22/860C1 PS22/860C2 PS22/860C3 PS22/861C1 PS22/861C2 PS22/862 PS22/862C1 PS22/862C2 PS22/863C1 PS22/864 PS22/864C1 PS22/865 PS22/865C1 PS22/865CA1 PS22/866 PS22/866C1 PS22/866C2 PS22/866C3 PS22/866C4 PS22/866C5 PS22/867 PS22/867C1 PS22/868 PS22/868C1 PS22/868C2 Smetacek, Victor de Baar, Hein J W Bathmann, Ulrich Lochte, Karin Rutgers van der Loeff, Michiel M Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 |
topic_facet |
ANT-X/6 AWI_BioOce Biological Oceanography @ AWI CT CTD/Rosette CTD-RO DIVERSE Giant water sampler GWS JGOFS Joint Global Ocean Flux Study MUC MultiCorer Polarstern PS22 PS22/6-track PS22/856C1 PS22/857 PS22/857C1 PS22/858C1 PS22/858C2 PS22/859 PS22/859C1 PS22/859C2 PS22/860 PS22/860C1 PS22/860C2 PS22/860C3 PS22/861C1 PS22/861C2 PS22/862 PS22/862C1 PS22/862C2 PS22/863C1 PS22/864 PS22/864C1 PS22/865 PS22/865C1 PS22/865CA1 PS22/866 PS22/866C1 PS22/866C2 PS22/866C3 PS22/866C4 PS22/866C5 PS22/867 PS22/867C1 PS22/868 PS22/868C1 PS22/868C2 |
description |
The R.V. Polarstern cruise ANT X/6, part of the international Southern Ocean JGOFS programme, investigated phytoplankton spring bloom development and its biogeochemical effects in different water masses of the Atlantic sector of the Southern Ocean: the Polar Frontal region (PFr), the southern Antarctic Circumpolar Current zone (sACC), its boundary with the Weddell Gyre (AWB) and the marginal ice zone (MIZ). The relative roles of physical stability, iron limitation and grazing pressure in enhancing or constraining phytoplankton biomass accumulation were examined. Three sections were carried out between the PFr and the ice edge along the 6°W meridian from early October to late November 1992. This paper summarises the major findings of the cruise and discusses their implications for our understanding of Southern Ocean ecology and biogeochemistry. A major finding was the negligible build-up of plankton biomass and concomitant absence of CO2 drawdown associated with seasonal retreat of the ice cover. In striking contrast to this unexpected poverty of both the MIZ and the frontal region of the AWB, distinct phytoplankton blooms, dominated by different diatom species, accumulated in the PFr. Chlorophyll stocks in the sACC remained monotonously low throughout the study. Our findings confirm those of other studies that frontal regions are the major productive sites in the Southern Ocean and that input of meltwater and associated ice algae to the surface layer from a retreating ice edge is by itself an insufficient condition for induction of phytoplankton blooms. The blooms in the PFr developed under conditions of shallow mixing layers, high iron concentrations and relatively low grazing pressure. However, in all three blooms, high biomass extended to deeper than 70 m, which cannot be explained by either in situ growth or sinking out of a part of the population from the upper euphotic zone. Subduction of adjoining, shallower layers to explain depth distribution is invoked. Despite a clear CO2 drawdown in the Polar Frontal ... |
format |
Other/Unknown Material |
author |
Smetacek, Victor de Baar, Hein J W Bathmann, Ulrich Lochte, Karin Rutgers van der Loeff, Michiel M |
author_facet |
Smetacek, Victor de Baar, Hein J W Bathmann, Ulrich Lochte, Karin Rutgers van der Loeff, Michiel M |
author_sort |
Smetacek, Victor |
title |
Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 |
title_short |
Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 |
title_full |
Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 |
title_fullStr |
Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 |
title_full_unstemmed |
Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 |
title_sort |
physical, chemical and biological oceanography during polarstern cruise ant-x/6 |
publisher |
PANGAEA |
publishDate |
1997 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.728865 https://doi.org/10.1594/PANGAEA.728865 |
op_coverage |
MEDIAN LATITUDE: -53.302057 * MEDIAN LONGITUDE: -9.051421 * SOUTH-BOUND LATITUDE: -59.534300 * WEST-BOUND LONGITUDE: -61.075300 * NORTH-BOUND LATITUDE: -36.200000 * EAST-BOUND LONGITUDE: 15.220000 * DATE/TIME START: 1992-10-01T00:00:00 * DATE/TIME END: 1992-11-28T10:00:00 |
long_lat |
ENVELOPE(-61.075300,15.220000,-36.200000,-59.534300) |
genre |
Antarc* Antarctic ice algae Southern Ocean |
genre_facet |
Antarc* Antarctic ice algae Southern Ocean |
op_source |
Supplement to: Smetacek, Victor; de Baar, Hein J W; Bathmann, Ulrich; Lochte, Karin; Rutgers van der Loeff, Michiel M (1997): Ecology and biogeochemistry of the Antarctic circumpolar current during austral spring: Southern Ocean JGOFS Cruise ANT X/6 of R.V. Polarstern. Deep Sea Research Part II: Topical Studies in Oceanography, 44(1-2), 1-21, https://doi.org/10.1016/S0967-0645(96)00100-2 |
op_relation |
Rommets, Joop; Stoll, Michel H C; de Koster, R X; de Bruin, Taco F; de Baar, Hein J W; Bathmann, Ulrich; Smetacek, Victor (1997): Database of the JGOFS expedition ANT X/6 aboard R.V. Polarstern. Supplement data CD-ROM to: Smetacek, Victor; de Baar, Hein JW; Bathmann, Ulrich; Lochte, Karin; Rutgers van der Loeff, Michiel M (1997): Ecology and biogeochemistry of the Antarctic circumpolar current during austral spring: Southern Ocean JGOFS Cruise ANT X/6 of R.V. Polarstern. Deep-Sea Research Part II-Topical Studies in Oceanography, 44(1-2), 1-21, doi:10.1016/S0967-0645(96)00100-2, hdl:10013/epic.37569.d001 http://store.pangaea.de/Publications/Smetacek_et_al_1997/Smetacek_et_al_1997_CD.zip [dataset]. https://store.pangaea.de/Publications/Smetacek_et_al_1997/Smetacek_et_al_1997_CD.zip https://doi.pangaea.de/10.1594/PANGAEA.728865 https://doi.org/10.1594/PANGAEA.728865 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.72886510.1016/S0967-0645(96)00100-2 |
_version_ |
1810489466089897984 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.728865 2024-09-15T17:42:45+00:00 Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6 Smetacek, Victor de Baar, Hein J W Bathmann, Ulrich Lochte, Karin Rutgers van der Loeff, Michiel M MEDIAN LATITUDE: -53.302057 * MEDIAN LONGITUDE: -9.051421 * SOUTH-BOUND LATITUDE: -59.534300 * WEST-BOUND LONGITUDE: -61.075300 * NORTH-BOUND LATITUDE: -36.200000 * EAST-BOUND LONGITUDE: 15.220000 * DATE/TIME START: 1992-10-01T00:00:00 * DATE/TIME END: 1992-11-28T10:00:00 1997 application/zip, 43 datasets https://doi.pangaea.de/10.1594/PANGAEA.728865 https://doi.org/10.1594/PANGAEA.728865 en eng PANGAEA Rommets, Joop; Stoll, Michel H C; de Koster, R X; de Bruin, Taco F; de Baar, Hein J W; Bathmann, Ulrich; Smetacek, Victor (1997): Database of the JGOFS expedition ANT X/6 aboard R.V. Polarstern. Supplement data CD-ROM to: Smetacek, Victor; de Baar, Hein JW; Bathmann, Ulrich; Lochte, Karin; Rutgers van der Loeff, Michiel M (1997): Ecology and biogeochemistry of the Antarctic circumpolar current during austral spring: Southern Ocean JGOFS Cruise ANT X/6 of R.V. Polarstern. Deep-Sea Research Part II-Topical Studies in Oceanography, 44(1-2), 1-21, doi:10.1016/S0967-0645(96)00100-2, hdl:10013/epic.37569.d001 http://store.pangaea.de/Publications/Smetacek_et_al_1997/Smetacek_et_al_1997_CD.zip [dataset]. https://store.pangaea.de/Publications/Smetacek_et_al_1997/Smetacek_et_al_1997_CD.zip https://doi.pangaea.de/10.1594/PANGAEA.728865 https://doi.org/10.1594/PANGAEA.728865 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Smetacek, Victor; de Baar, Hein J W; Bathmann, Ulrich; Lochte, Karin; Rutgers van der Loeff, Michiel M (1997): Ecology and biogeochemistry of the Antarctic circumpolar current during austral spring: Southern Ocean JGOFS Cruise ANT X/6 of R.V. Polarstern. Deep Sea Research Part II: Topical Studies in Oceanography, 44(1-2), 1-21, https://doi.org/10.1016/S0967-0645(96)00100-2 ANT-X/6 AWI_BioOce Biological Oceanography @ AWI CT CTD/Rosette CTD-RO DIVERSE Giant water sampler GWS JGOFS Joint Global Ocean Flux Study MUC MultiCorer Polarstern PS22 PS22/6-track PS22/856C1 PS22/857 PS22/857C1 PS22/858C1 PS22/858C2 PS22/859 PS22/859C1 PS22/859C2 PS22/860 PS22/860C1 PS22/860C2 PS22/860C3 PS22/861C1 PS22/861C2 PS22/862 PS22/862C1 PS22/862C2 PS22/863C1 PS22/864 PS22/864C1 PS22/865 PS22/865C1 PS22/865CA1 PS22/866 PS22/866C1 PS22/866C2 PS22/866C3 PS22/866C4 PS22/866C5 PS22/867 PS22/867C1 PS22/868 PS22/868C1 PS22/868C2 dataset publication series 1997 ftpangaea https://doi.org/10.1594/PANGAEA.72886510.1016/S0967-0645(96)00100-2 2024-07-24T02:31:20Z The R.V. Polarstern cruise ANT X/6, part of the international Southern Ocean JGOFS programme, investigated phytoplankton spring bloom development and its biogeochemical effects in different water masses of the Atlantic sector of the Southern Ocean: the Polar Frontal region (PFr), the southern Antarctic Circumpolar Current zone (sACC), its boundary with the Weddell Gyre (AWB) and the marginal ice zone (MIZ). The relative roles of physical stability, iron limitation and grazing pressure in enhancing or constraining phytoplankton biomass accumulation were examined. Three sections were carried out between the PFr and the ice edge along the 6°W meridian from early October to late November 1992. This paper summarises the major findings of the cruise and discusses their implications for our understanding of Southern Ocean ecology and biogeochemistry. A major finding was the negligible build-up of plankton biomass and concomitant absence of CO2 drawdown associated with seasonal retreat of the ice cover. In striking contrast to this unexpected poverty of both the MIZ and the frontal region of the AWB, distinct phytoplankton blooms, dominated by different diatom species, accumulated in the PFr. Chlorophyll stocks in the sACC remained monotonously low throughout the study. Our findings confirm those of other studies that frontal regions are the major productive sites in the Southern Ocean and that input of meltwater and associated ice algae to the surface layer from a retreating ice edge is by itself an insufficient condition for induction of phytoplankton blooms. The blooms in the PFr developed under conditions of shallow mixing layers, high iron concentrations and relatively low grazing pressure. However, in all three blooms, high biomass extended to deeper than 70 m, which cannot be explained by either in situ growth or sinking out of a part of the population from the upper euphotic zone. Subduction of adjoining, shallower layers to explain depth distribution is invoked. Despite a clear CO2 drawdown in the Polar Frontal ... Other/Unknown Material Antarc* Antarctic ice algae Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-61.075300,15.220000,-36.200000,-59.534300) |