Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean
The chlorophyll a (chl a) biomass and primary production of three phytoplankton size fractions were estimated in the Atlantic sector of the Southern Ocean from 12 December 1995 to 20 January 1996. Elevated concentrations of chl a, primary production, and contribution of microplankton (>20 μm) coi...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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ftnerc:oai:nora.nerc.ac.uk:163100 2023-05-15T18:24:50+02:00 Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean Tremblay, J.E. Lucas, M.I. Kattner, G. Pollard, R.T. Strass, V.H. Bathmann, U.V. Bracher, A. 2002 http://nora.nerc.ac.uk/id/eprint/163100/ https://doi.org/10.1016/S0967-0645(02)00111-X unknown Tremblay, J.E.; Lucas, M.I.; Kattner, G.; Pollard, R.T.; Strass, V.H.; Bathmann, U.V.; Bracher, A. 2002 Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean. Deep-Sea Research II, 49 (18). 3793-3811. https://doi.org/10.1016/S0967-0645(02)00111-X <https://doi.org/10.1016/S0967-0645(02)00111-X> Publication - Article PeerReviewed 2002 ftnerc https://doi.org/10.1016/S0967-0645(02)00111-X 2023-02-04T19:35:17Z The chlorophyll a (chl a) biomass and primary production of three phytoplankton size fractions were estimated in the Atlantic sector of the Southern Ocean from 12 December 1995 to 20 January 1996. Elevated concentrations of chl a, primary production, and contribution of microplankton (>20 μm) coincided with dominance by large or long-chained diatoms (Thalassiothrix spp., Pseudonitzschia lineola, and Chaetoceros spp.) in the Polar Frontal Zone (PFZ, 49.5°S–52°S). Vertically resolved assimilation numbers (i.e. primary production normalized to chl a) and intrinsic growth rates of microplankton were much lower at high-biomass stations of the Northern Polar Frontal Zone (NPFZ) than in adjacent waters. Silicic acid appeared to be the proximal factor limiting the growth and yield of resident diatoms in the NPFZ. A carbon budget showed that, during the sampling period, diatom dominance at high-biomass sites was associated with near-steady-state conditions. This system exhibited a low POC sinking flux relative to total primary production, despite strong dominance by microplankton. South of 52°S, total chl a and primary production were generally low, but increased sharply in a mixed Phaeocystis-diatom bloom that extended from 61°S to 65°S in the Seasonal Ice Zone (SIZ). We estimated that the PFZ contributes from 37% to 67% of the total open-water new production in the Southern Ocean near the Greenwich meridian, depending on whether blooms occur or not in the SIZ. Article in Journal/Newspaper Southern Ocean Natural Environment Research Council: NERC Open Research Archive Greenwich Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 49 18 3793 3811 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
The chlorophyll a (chl a) biomass and primary production of three phytoplankton size fractions were estimated in the Atlantic sector of the Southern Ocean from 12 December 1995 to 20 January 1996. Elevated concentrations of chl a, primary production, and contribution of microplankton (>20 μm) coincided with dominance by large or long-chained diatoms (Thalassiothrix spp., Pseudonitzschia lineola, and Chaetoceros spp.) in the Polar Frontal Zone (PFZ, 49.5°S–52°S). Vertically resolved assimilation numbers (i.e. primary production normalized to chl a) and intrinsic growth rates of microplankton were much lower at high-biomass stations of the Northern Polar Frontal Zone (NPFZ) than in adjacent waters. Silicic acid appeared to be the proximal factor limiting the growth and yield of resident diatoms in the NPFZ. A carbon budget showed that, during the sampling period, diatom dominance at high-biomass sites was associated with near-steady-state conditions. This system exhibited a low POC sinking flux relative to total primary production, despite strong dominance by microplankton. South of 52°S, total chl a and primary production were generally low, but increased sharply in a mixed Phaeocystis-diatom bloom that extended from 61°S to 65°S in the Seasonal Ice Zone (SIZ). We estimated that the PFZ contributes from 37% to 67% of the total open-water new production in the Southern Ocean near the Greenwich meridian, depending on whether blooms occur or not in the SIZ. |
format |
Article in Journal/Newspaper |
author |
Tremblay, J.E. Lucas, M.I. Kattner, G. Pollard, R.T. Strass, V.H. Bathmann, U.V. Bracher, A. |
spellingShingle |
Tremblay, J.E. Lucas, M.I. Kattner, G. Pollard, R.T. Strass, V.H. Bathmann, U.V. Bracher, A. Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean |
author_facet |
Tremblay, J.E. Lucas, M.I. Kattner, G. Pollard, R.T. Strass, V.H. Bathmann, U.V. Bracher, A. |
author_sort |
Tremblay, J.E. |
title |
Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean |
title_short |
Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean |
title_full |
Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean |
title_fullStr |
Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean |
title_sort |
significance of the polar frontal zone for large-sized diatoms and new production during summer in the atlantic sector of the southern ocean |
publishDate |
2002 |
url |
http://nora.nerc.ac.uk/id/eprint/163100/ https://doi.org/10.1016/S0967-0645(02)00111-X |
geographic |
Greenwich Southern Ocean |
geographic_facet |
Greenwich Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Tremblay, J.E.; Lucas, M.I.; Kattner, G.; Pollard, R.T.; Strass, V.H.; Bathmann, U.V.; Bracher, A. 2002 Significance of the Polar Frontal Zone for large-sized diatoms and new production during summer in the Atlantic sector of the Southern Ocean. Deep-Sea Research II, 49 (18). 3793-3811. https://doi.org/10.1016/S0967-0645(02)00111-X <https://doi.org/10.1016/S0967-0645(02)00111-X> |
op_doi |
https://doi.org/10.1016/S0967-0645(02)00111-X |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
49 |
container_issue |
18 |
container_start_page |
3793 |
op_container_end_page |
3811 |
_version_ |
1766205793398423552 |