Size-fractionated phytoplankton biomass and primary production in the Southern Ocean
The factors controlling primary production in the Southern Ocean were investigated over two years during two cruises of the South African National Antarctic Program (SANAP). The first cruise was conducted to the region of the eastern Atlantic sector of the Southern Ocean during the collaborative Sca...
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ftrhodesunivcory:vital:5765 2023-05-15T13:49:37+02:00 Size-fractionated phytoplankton biomass and primary production in the Southern Ocean Balarin, Marianne G 1999 125 p. pdf http://hdl.handle.net/10962/d1005453 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:5765 English eng Rhodes University Faculty of Science, Zoology and Entomology vital:5765 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:5765 http://hdl.handle.net/10962/d1005453 Balarin, Marianne G Biomass -- Analysis Phytoplankton Atlantic Ocean Thesis Masters MSc 1999 ftrhodesunivcory 2022-12-26T10:52:19Z The factors controlling primary production in the Southern Ocean were investigated over two years during two cruises of the South African National Antarctic Program (SANAP). The first cruise was conducted to the region of the eastern Atlantic sector of the Southern Ocean during the collaborative Scandinavian/South African Antarctic expedition conducted in austral summer (DecemberIFebruary) 1997-1998. Production studies were conducted in the vicinity of the Marginal Ice Zone (MIZ), Interfrontal Zone (IFZ) and Antarctic Polar Front(APF). The second cruise was conducted during the Third Marion Island Oceanographic Survey (MIOS III) to the region of the Sub-Antarctic Prince Edward Islands in austral autumn (April/May) 1998. Size-fractionated production rates were estimated by 14C incorporation using standard JGOFS protocols. Oceanographic data from the first cruise suggest that the three regions can be divided into two distinct regimes. Stations occupied in the vicinity of the MIZ and the APF were characterised by a shallow mixed layer depth « 40m) while at the IFZ-stations, the mixed layer depth exceeded the 1% light depth. Microphytoplankton dominated integrated chlorophyll-a biomass in the MIZ (total chlorophyll a ranged between 15.4 and 41.3 mg Chi-a. m-2) and at the APF (range between 10.7 and 31.4 mg Chi-a. m-2) , comprising > 50% of total chlorophyll-a at all these stations. Xl Within the IFZ (2 stations), nanophytoplankton dominated total integrated Chl-a biomass (range between 5.6 and 8.8 mg Chi-a. m-2) comprising, on average, 36% of the total. Picophytoplankton comprised an average of 12% of the total Chl-a biomass (range between 3.1 and 5.9 mg Chi-a. m-2) in the MIZ, 36% in the IFZ (range between 6.4 and 7.8 mg Chl-a . m-2) and 20% in the vicinity of the APF (range between 6.8 and 10.6 mg Chi-a. m-2). Total integrated primary production ranged between 316 and 729 mg C . m-2. d-1 at stations occupied in the vicinity of the MIZ, and between 292 and 317 mg C . m·2• d-l within the IFZ. At stations occupied ... Master Thesis Antarc* Antarctic Marion Island Prince Edward Islands Southern Ocean Rhodes University Cory: Repository Antarctic Austral Southern Ocean |
institution |
Open Polar |
collection |
Rhodes University Cory: Repository |
op_collection_id |
ftrhodesunivcory |
language |
English |
topic |
Biomass -- Analysis Phytoplankton Atlantic Ocean |
spellingShingle |
Biomass -- Analysis Phytoplankton Atlantic Ocean Balarin, Marianne G Size-fractionated phytoplankton biomass and primary production in the Southern Ocean |
topic_facet |
Biomass -- Analysis Phytoplankton Atlantic Ocean |
description |
The factors controlling primary production in the Southern Ocean were investigated over two years during two cruises of the South African National Antarctic Program (SANAP). The first cruise was conducted to the region of the eastern Atlantic sector of the Southern Ocean during the collaborative Scandinavian/South African Antarctic expedition conducted in austral summer (DecemberIFebruary) 1997-1998. Production studies were conducted in the vicinity of the Marginal Ice Zone (MIZ), Interfrontal Zone (IFZ) and Antarctic Polar Front(APF). The second cruise was conducted during the Third Marion Island Oceanographic Survey (MIOS III) to the region of the Sub-Antarctic Prince Edward Islands in austral autumn (April/May) 1998. Size-fractionated production rates were estimated by 14C incorporation using standard JGOFS protocols. Oceanographic data from the first cruise suggest that the three regions can be divided into two distinct regimes. Stations occupied in the vicinity of the MIZ and the APF were characterised by a shallow mixed layer depth « 40m) while at the IFZ-stations, the mixed layer depth exceeded the 1% light depth. Microphytoplankton dominated integrated chlorophyll-a biomass in the MIZ (total chlorophyll a ranged between 15.4 and 41.3 mg Chi-a. m-2) and at the APF (range between 10.7 and 31.4 mg Chi-a. m-2) , comprising > 50% of total chlorophyll-a at all these stations. Xl Within the IFZ (2 stations), nanophytoplankton dominated total integrated Chl-a biomass (range between 5.6 and 8.8 mg Chi-a. m-2) comprising, on average, 36% of the total. Picophytoplankton comprised an average of 12% of the total Chl-a biomass (range between 3.1 and 5.9 mg Chi-a. m-2) in the MIZ, 36% in the IFZ (range between 6.4 and 7.8 mg Chl-a . m-2) and 20% in the vicinity of the APF (range between 6.8 and 10.6 mg Chi-a. m-2). Total integrated primary production ranged between 316 and 729 mg C . m-2. d-1 at stations occupied in the vicinity of the MIZ, and between 292 and 317 mg C . m·2• d-l within the IFZ. At stations occupied ... |
format |
Master Thesis |
author |
Balarin, Marianne G |
author_facet |
Balarin, Marianne G |
author_sort |
Balarin, Marianne G |
title |
Size-fractionated phytoplankton biomass and primary production in the Southern Ocean |
title_short |
Size-fractionated phytoplankton biomass and primary production in the Southern Ocean |
title_full |
Size-fractionated phytoplankton biomass and primary production in the Southern Ocean |
title_fullStr |
Size-fractionated phytoplankton biomass and primary production in the Southern Ocean |
title_full_unstemmed |
Size-fractionated phytoplankton biomass and primary production in the Southern Ocean |
title_sort |
size-fractionated phytoplankton biomass and primary production in the southern ocean |
publisher |
Rhodes University |
publishDate |
1999 |
url |
http://hdl.handle.net/10962/d1005453 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:5765 |
geographic |
Antarctic Austral Southern Ocean |
geographic_facet |
Antarctic Austral Southern Ocean |
genre |
Antarc* Antarctic Marion Island Prince Edward Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Marion Island Prince Edward Islands Southern Ocean |
op_relation |
vital:5765 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:5765 http://hdl.handle.net/10962/d1005453 |
op_rights |
Balarin, Marianne G |
_version_ |
1766251882932600832 |