Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean
Results are presented from size fractionated chlorophyll a (Chl a) and primary production studies along a transect between Antarctica and southern Africa during the second South African Antarctic Marine Ecosystem Study (SAAMES II), conducted in late austral summer (January to February) 1993. Total i...
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fthighwire:oai:open-archive.highwire.org:plankt:23/6/611 2023-05-15T13:54:23+02:00 Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean Froneman, P. W. Laubscher, R. K. Mcquaid, C. D. 2001-06-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/23/6/611 https://doi.org/10.1093/plankt/23.6.611 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/23/6/611 http://dx.doi.org/10.1093/plankt/23.6.611 Copyright (C) 2001, Oxford University Press ORIGINAL ARTICLES TEXT 2001 fthighwire https://doi.org/10.1093/plankt/23.6.611 2013-05-26T16:23:22Z Results are presented from size fractionated chlorophyll a (Chl a) and primary production studies along a transect between Antarctica and southern Africa during the second South African Antarctic Marine Ecosystem Study (SAAMES II), conducted in late austral summer (January to February) 1993. Total integrated Chl a along the transect was highest in the vicinity of the Marginal Ice Zone (MIZ) and Antarctic Polar Front (APF). At these stations, integrated Chl a biomass was always >25 mg Chl a m–2 and was dominated by microphytoplankton. Although nominal increases inChl a biomass were also associated with the Subantarctic Front (SAF) and Subtropical Convergence (STC), total Chl a biomass in these regions was dominated by nanophytoplankton. Within the inter-frontal regions, total integrated Chl a biomass was lower, generally <25 mg Chl a m–2, and was always dominated by nanophytoplankton. An exception was found in the Agulhas Return Current (ARC) where picophytoplankton dominated. Total daily integrated production along the transect ranged between 60 and 436 mg C m–2 day–1. Elevated production rates were recorded at stations occupied in the vicinity of the MIZ and at all the major oceanic frontal systems. The contributions of the various size fractions to total daily production displayed the same spatial pattern as integrated biomass, with microphytoplankton being the most important contributor in areas characterized by elevated phytoplankton biomass. Outside these regions, nanophytoplankton dominated the total phytoplankton production. Again, an exception was found in the ARC north of the STC where picophytoplankton dominated total production. There, the lowest production along the entire transect was recorded, with total daily integrated production always <90 mg C m–2 day–1. The increased production rates recorded in the MIZ appeared to result from increased water column stability as indicated by a shallow mixed-layer depth. Within the inter-frontal regions, the existence of a deep mixed layer appeared to ... Text Antarc* Antarctic Antarctica Southern Ocean HighWire Press (Stanford University) Antarctic Southern Ocean Austral Journal of Plankton Research 23 6 611 622 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Froneman, P. W. Laubscher, R. K. Mcquaid, C. D. Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean |
topic_facet |
ORIGINAL ARTICLES |
description |
Results are presented from size fractionated chlorophyll a (Chl a) and primary production studies along a transect between Antarctica and southern Africa during the second South African Antarctic Marine Ecosystem Study (SAAMES II), conducted in late austral summer (January to February) 1993. Total integrated Chl a along the transect was highest in the vicinity of the Marginal Ice Zone (MIZ) and Antarctic Polar Front (APF). At these stations, integrated Chl a biomass was always >25 mg Chl a m–2 and was dominated by microphytoplankton. Although nominal increases inChl a biomass were also associated with the Subantarctic Front (SAF) and Subtropical Convergence (STC), total Chl a biomass in these regions was dominated by nanophytoplankton. Within the inter-frontal regions, total integrated Chl a biomass was lower, generally <25 mg Chl a m–2, and was always dominated by nanophytoplankton. An exception was found in the Agulhas Return Current (ARC) where picophytoplankton dominated. Total daily integrated production along the transect ranged between 60 and 436 mg C m–2 day–1. Elevated production rates were recorded at stations occupied in the vicinity of the MIZ and at all the major oceanic frontal systems. The contributions of the various size fractions to total daily production displayed the same spatial pattern as integrated biomass, with microphytoplankton being the most important contributor in areas characterized by elevated phytoplankton biomass. Outside these regions, nanophytoplankton dominated the total phytoplankton production. Again, an exception was found in the ARC north of the STC where picophytoplankton dominated total production. There, the lowest production along the entire transect was recorded, with total daily integrated production always <90 mg C m–2 day–1. The increased production rates recorded in the MIZ appeared to result from increased water column stability as indicated by a shallow mixed-layer depth. Within the inter-frontal regions, the existence of a deep mixed layer appeared to ... |
format |
Text |
author |
Froneman, P. W. Laubscher, R. K. Mcquaid, C. D. |
author_facet |
Froneman, P. W. Laubscher, R. K. Mcquaid, C. D. |
author_sort |
Froneman, P. W. |
title |
Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean |
title_short |
Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean |
title_full |
Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean |
title_fullStr |
Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean |
title_full_unstemmed |
Size-fractionated Primary Production in the South Atlantic and Atlantic Sectors of the Southern Ocean |
title_sort |
size-fractionated primary production in the south atlantic and atlantic sectors of the southern ocean |
publisher |
Oxford University Press |
publishDate |
2001 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/23/6/611 https://doi.org/10.1093/plankt/23.6.611 |
geographic |
Antarctic Southern Ocean Austral |
geographic_facet |
Antarctic Southern Ocean Austral |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/23/6/611 http://dx.doi.org/10.1093/plankt/23.6.611 |
op_rights |
Copyright (C) 2001, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/23.6.611 |
container_title |
Journal of Plankton Research |
container_volume |
23 |
container_issue |
6 |
container_start_page |
611 |
op_container_end_page |
622 |
_version_ |
1766260136160002048 |