Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments
[1] Biological uptake rates of inorganic carbon and nitrate were measured during two sequential tracer release gas exchange experiments, together known as the Southern Ocean Gas Exchange Experiment (SO GasEx) in the southwest Atlantic sector of the Southern Ocean Antarctic Zone (51N, 38W). Primary p...
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ftunivtasecite:oai:ecite.utas.edu.au:80216 2023-05-15T14:02:30+02:00 Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments Lance, VP Strutton, PG Vaillancourt, RD Hargreaves, BR Zhang, J-Z Marra, J 2012 application/pdf https://doi.org/10.1029/2011JC007687 http://ecite.utas.edu.au/80216 en eng Amer Geophysical Union http://ecite.utas.edu.au/80216/1/lance_sogasex.pdf http://dx.doi.org/10.1029/2011JC007687 Lance, VP and Strutton, PG and Vaillancourt, RD and Hargreaves, BR and Zhang, J-Z and Marra, J, Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments, Journal of Geophysical Research: Oceans, 117, (4) Article C00F14. ISSN 0148-0227 (2012) [Refereed Article] http://ecite.utas.edu.au/80216 Earth Sciences Oceanography Biological Oceanography Refereed Article PeerReviewed 2012 ftunivtasecite https://doi.org/10.1029/2011JC007687 2019-12-13T21:45:34Z [1] Biological uptake rates of inorganic carbon and nitrate were measured during two sequential tracer release gas exchange experiments, together known as the Southern Ocean Gas Exchange Experiment (SO GasEx) in the southwest Atlantic sector of the Southern Ocean Antarctic Zone (51N, 38W). Primary productivity estimated from 14 C incubations ranged from 26.7 to 47.2 mmol C m −2 d −1 in the first experiment (Patch 1) and 13.7 to 39.4 mmol C m −2 d −1 in the second experiment (Patch 2). Nitrate-based productivity estimated from 15 NO 3 incubations ranged from 5.8 to 13.1 mmol C m −2 d −1 in Patch 1 and 1.9 to 7.1 mmol C m −2 d −1 in Patch 2. The average ratio of nitrate-based productivity to primary productivity (approximating the f ratio) was 0.24 in Patch 1 and 0.15 in Patch 2. Chlorophyll concentrations for both patches were less than 1 mg m −3 . Photochemical efficiency (F v /F m ) was low (∼0.3) in Patch 1 and moderate (∼0.45) in Patch 2. Si(OH) 4 concentrations were potentially limiting (<1 mmol m −3 for Patch 1 and ∼3 mmol m −3 for Patch 2), while NH 4 + concentrations were elevated (∼1 mmol m −3 for Patch 1 and ∼2.2 mmol m −3 for Patch 2) compared with typical open ocean Antarctic Zone water. We hypothesize that Patch 1 productivity was regulated by the availability of Si(OH) 4 , while Patch 2 productivity was regulated by grazers. Primary production and nitrate-based production (as a proxy for C export) determined here provide components for a mixed layer carbon budget from which the air-sea flux of CO 2 will be quantified. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean Journal of Geophysical Research: Oceans 117 C4 n/a n/a |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological Oceanography |
spellingShingle |
Earth Sciences Oceanography Biological Oceanography Lance, VP Strutton, PG Vaillancourt, RD Hargreaves, BR Zhang, J-Z Marra, J Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments |
topic_facet |
Earth Sciences Oceanography Biological Oceanography |
description |
[1] Biological uptake rates of inorganic carbon and nitrate were measured during two sequential tracer release gas exchange experiments, together known as the Southern Ocean Gas Exchange Experiment (SO GasEx) in the southwest Atlantic sector of the Southern Ocean Antarctic Zone (51N, 38W). Primary productivity estimated from 14 C incubations ranged from 26.7 to 47.2 mmol C m −2 d −1 in the first experiment (Patch 1) and 13.7 to 39.4 mmol C m −2 d −1 in the second experiment (Patch 2). Nitrate-based productivity estimated from 15 NO 3 incubations ranged from 5.8 to 13.1 mmol C m −2 d −1 in Patch 1 and 1.9 to 7.1 mmol C m −2 d −1 in Patch 2. The average ratio of nitrate-based productivity to primary productivity (approximating the f ratio) was 0.24 in Patch 1 and 0.15 in Patch 2. Chlorophyll concentrations for both patches were less than 1 mg m −3 . Photochemical efficiency (F v /F m ) was low (∼0.3) in Patch 1 and moderate (∼0.45) in Patch 2. Si(OH) 4 concentrations were potentially limiting (<1 mmol m −3 for Patch 1 and ∼3 mmol m −3 for Patch 2), while NH 4 + concentrations were elevated (∼1 mmol m −3 for Patch 1 and ∼2.2 mmol m −3 for Patch 2) compared with typical open ocean Antarctic Zone water. We hypothesize that Patch 1 productivity was regulated by the availability of Si(OH) 4 , while Patch 2 productivity was regulated by grazers. Primary production and nitrate-based production (as a proxy for C export) determined here provide components for a mixed layer carbon budget from which the air-sea flux of CO 2 will be quantified. |
format |
Article in Journal/Newspaper |
author |
Lance, VP Strutton, PG Vaillancourt, RD Hargreaves, BR Zhang, J-Z Marra, J |
author_facet |
Lance, VP Strutton, PG Vaillancourt, RD Hargreaves, BR Zhang, J-Z Marra, J |
author_sort |
Lance, VP |
title |
Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments |
title_short |
Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments |
title_full |
Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments |
title_fullStr |
Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments |
title_full_unstemmed |
Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments |
title_sort |
primary productivity, new productivity, and their relation to carbon flux during two southern ocean gas exchange tracer experiments |
publisher |
Amer Geophysical Union |
publishDate |
2012 |
url |
https://doi.org/10.1029/2011JC007687 http://ecite.utas.edu.au/80216 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
http://ecite.utas.edu.au/80216/1/lance_sogasex.pdf http://dx.doi.org/10.1029/2011JC007687 Lance, VP and Strutton, PG and Vaillancourt, RD and Hargreaves, BR and Zhang, J-Z and Marra, J, Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments, Journal of Geophysical Research: Oceans, 117, (4) Article C00F14. ISSN 0148-0227 (2012) [Refereed Article] http://ecite.utas.edu.au/80216 |
op_doi |
https://doi.org/10.1029/2011JC007687 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
117 |
container_issue |
C4 |
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n/a |
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1766272807592787968 |