Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site
International audience JGOFS-KERFIX (KERguelen point FIXe) time-series station, located south of the polar front in the Indian sector of the Antarctic Ocean, was occupied monthly between January 1990 and March 1995. Annual cycles of dissolved inorganic carbon (DIC), total alkalinity (TALK), oxygen (...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Online Access: | https://hal.science/hal-01245602 https://doi.org/10.1016/S0967-0637(00)00086-8 |
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ftunivnantes:oai:HAL:hal-01245602v1 2023-05-15T13:43:45+02:00 Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site Louanchi, Ferial Ruiz-Pino, Diana Jeandel, Catherine Brunet, Christian Schauer, Bernard Masson, Annick Fiala, Michel Poisson, Alain Laboratoire de Physique et Chimie Marines (LPCM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Université de Brest (UBO) 2001-07 https://hal.science/hal-01245602 https://doi.org/10.1016/S0967-0637(00)00086-8 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0637(00)00086-8 hal-01245602 https://hal.science/hal-01245602 BIBCODE: 2001DSRI.48.1581L doi:10.1016/S0967-0637(00)00086-8 ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-01245602 Deep Sea Research Part I: Oceanographic Research Papers, 2001, 48 (7), pp.1581-1603. ⟨10.1016/S0967-0637(00)00086-8⟩ Temporal distribution Oxygen Carbon dioxide Biogeochemical cycles Antarctic zone Biological production Oceanic mixed layer Carbon cycle Nutrient cycles [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2001 ftunivnantes https://doi.org/10.1016/S0967-0637(00)00086-8 2023-01-18T01:16:35Z International audience JGOFS-KERFIX (KERguelen point FIXe) time-series station, located south of the polar front in the Indian sector of the Antarctic Ocean, was occupied monthly between January 1990 and March 1995. Annual cycles of dissolved inorganic carbon (DIC), total alkalinity (TALK), oxygen (O2) and nutrients (nitrate, silicate, phosphate and ammonia) in the upper ocean are presented for this site. From seasonal drawdown of nutrients and DIC, we estimate a spring–summer net community production of 3.2±0.5 mol m −2 and C/N/P ratios of 100/16/1. The Si/N ratio varies between 1.8 and 3, suggesting low iron concentrations. The spring–summer biogenic silicon export derived from silicate drawdown is 1.18 mol m −2 , consistent with model estimates of silicate export at this site. Seasonal and interannual variations of oxygen, nitrate and DIC due to physical and biological processes are quantified using a simple month-to-month budget formulation. From these budgets, an annual net community production of 5.7±3.3 mol m −2 yr −1 is estimated, about twice the averaged spring–summer production, indicating that, at KERFIX, there is a positive net community production throughout the year. Air–sea CO2 fluxes show that KERFIX is a strong CO2 sink for the atmosphere of 2.4–5.1 mol m −2 yr −1 in 1993, depending on the gas exchange formulation used. A 2.1–3.3 mol m −2 yr −1 outgassing of O2 is observed at KERFIX except in 1993 and 1994 where a decreasing trend of temperature induces an increase of O2 solubility. Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Antarctic Ocean Indian Kerguelen The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 48 7 1581 1603 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Temporal distribution Oxygen Carbon dioxide Biogeochemical cycles Antarctic zone Biological production Oceanic mixed layer Carbon cycle Nutrient cycles [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
Temporal distribution Oxygen Carbon dioxide Biogeochemical cycles Antarctic zone Biological production Oceanic mixed layer Carbon cycle Nutrient cycles [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Louanchi, Ferial Ruiz-Pino, Diana Jeandel, Catherine Brunet, Christian Schauer, Bernard Masson, Annick Fiala, Michel Poisson, Alain Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site |
topic_facet |
Temporal distribution Oxygen Carbon dioxide Biogeochemical cycles Antarctic zone Biological production Oceanic mixed layer Carbon cycle Nutrient cycles [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience JGOFS-KERFIX (KERguelen point FIXe) time-series station, located south of the polar front in the Indian sector of the Antarctic Ocean, was occupied monthly between January 1990 and March 1995. Annual cycles of dissolved inorganic carbon (DIC), total alkalinity (TALK), oxygen (O2) and nutrients (nitrate, silicate, phosphate and ammonia) in the upper ocean are presented for this site. From seasonal drawdown of nutrients and DIC, we estimate a spring–summer net community production of 3.2±0.5 mol m −2 and C/N/P ratios of 100/16/1. The Si/N ratio varies between 1.8 and 3, suggesting low iron concentrations. The spring–summer biogenic silicon export derived from silicate drawdown is 1.18 mol m −2 , consistent with model estimates of silicate export at this site. Seasonal and interannual variations of oxygen, nitrate and DIC due to physical and biological processes are quantified using a simple month-to-month budget formulation. From these budgets, an annual net community production of 5.7±3.3 mol m −2 yr −1 is estimated, about twice the averaged spring–summer production, indicating that, at KERFIX, there is a positive net community production throughout the year. Air–sea CO2 fluxes show that KERFIX is a strong CO2 sink for the atmosphere of 2.4–5.1 mol m −2 yr −1 in 1993, depending on the gas exchange formulation used. A 2.1–3.3 mol m −2 yr −1 outgassing of O2 is observed at KERFIX except in 1993 and 1994 where a decreasing trend of temperature induces an increase of O2 solubility. |
author2 |
Laboratoire de Physique et Chimie Marines (LPCM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Université de Brest (UBO) |
format |
Article in Journal/Newspaper |
author |
Louanchi, Ferial Ruiz-Pino, Diana Jeandel, Catherine Brunet, Christian Schauer, Bernard Masson, Annick Fiala, Michel Poisson, Alain |
author_facet |
Louanchi, Ferial Ruiz-Pino, Diana Jeandel, Catherine Brunet, Christian Schauer, Bernard Masson, Annick Fiala, Michel Poisson, Alain |
author_sort |
Louanchi, Ferial |
title |
Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site |
title_short |
Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site |
title_full |
Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site |
title_fullStr |
Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site |
title_full_unstemmed |
Dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the Antarctic Ocean JGOFS-KERFIX site |
title_sort |
dissolved inorganic carbon, alkalinity, nutrient and oxygen seasonal and interannual variations at the antarctic ocean jgofs-kerfix site |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.science/hal-01245602 https://doi.org/10.1016/S0967-0637(00)00086-8 |
geographic |
Antarctic Antarctic Ocean Indian Kerguelen The Antarctic |
geographic_facet |
Antarctic Antarctic Ocean Indian Kerguelen The Antarctic |
genre |
Antarc* Antarctic Antarctic Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-01245602 Deep Sea Research Part I: Oceanographic Research Papers, 2001, 48 (7), pp.1581-1603. ⟨10.1016/S0967-0637(00)00086-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0637(00)00086-8 hal-01245602 https://hal.science/hal-01245602 BIBCODE: 2001DSRI.48.1581L doi:10.1016/S0967-0637(00)00086-8 |
op_doi |
https://doi.org/10.1016/S0967-0637(00)00086-8 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
48 |
container_issue |
7 |
container_start_page |
1581 |
op_container_end_page |
1603 |
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1766192735401803776 |