Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean
International audience Total dissolvable iron (TDFe), particulate iron (PFe) and hydrogen peroxide (H2O2 measurements were performed along a N-S transect in the upper 250 m in the Southern Ocean (62°00E/66°42S–49°00S, ANTARES II cruise, February 1994). TDFe was organically extracted (APDC/DDDC-chlor...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1998
|
Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-00456475 https://doi.org/10.1016/S0012-821X(97)00004-6 |
id |
ftinsu:oai:HAL:hal-00456475v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-00456475v1 2023-12-17T10:50:27+01:00 Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean Sarthou, Géraldine Jeandel, C. Brisset, Laurence Amouroux, David Besson, Thierry Donard, Olivier François Xavier Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) 1998-06-05 https://hal.univ-brest.fr/hal-00456475 https://doi.org/10.1016/S0012-821X(97)00004-6 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(97)00004-6 hal-00456475 https://hal.univ-brest.fr/hal-00456475 doi:10.1016/S0012-821X(97)00004-6 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.univ-brest.fr/hal-00456475 Earth and Planetary Science Letters, 1998, 147 (1-4), pp.83-92. ⟨10.1016/S0012-821X(97)00004-6⟩ iron hydrogen peroxide Indian Ocean South Atlantic phytoplankton sea water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1998 ftinsu https://doi.org/10.1016/S0012-821X(97)00004-6 2023-11-22T17:25:21Z International audience Total dissolvable iron (TDFe), particulate iron (PFe) and hydrogen peroxide (H2O2 measurements were performed along a N-S transect in the upper 250 m in the Southern Ocean (62°00E/66°42S–49°00S, ANTARES II cruise, February 1994). TDFe was organically extracted (APDC/DDDC-chloroform) and analysed by Graphite Furnace Atomic Absorption Spectrometry (GFAAS), PFe was analysed by GFAAS following a strong mixed-acid leach, and H2O2 was analysed on board by fluorometry. The respective detection limits are equal to 0.13 nmol/kg, 0.02 nmol/kg, and 3.0 nmol/kg. TDFe concentrations vary from 0.4 to 6.2 nmol/kg and profiles are not completely depleted in the surface. PFe concentrations vary from 0.02 to 0.2 nmol/kg. Iron/carbon (Fe/C) uptake ratios for phytoplankton were calculated either from seawater or particle measurements. They are variable along the transect but are consistent when they could be compared. All the observed ratios are within the range of values proposed for the Fe/C uptake ratios by phytoplankton. Using our uptake ratio calculated in the Permanent Open Ocean Zone (4 · 10−6 mol/mol), we estimate that the primary production which can be supported by the iron input flux into the surface waters is two times higher than the measured primary production in the same area. In the surface waters, H2O2 concentrations vary from 5.0 to 19.7 nmol/kg. Such low concentrations are due to strong vertical mixing, low dissolved organic matter concentrations and the latitude of the site. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Indian Southern Ocean Earth and Planetary Science Letters 147 1-4 83 92 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
iron hydrogen peroxide Indian Ocean South Atlantic phytoplankton sea water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
iron hydrogen peroxide Indian Ocean South Atlantic phytoplankton sea water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sarthou, Géraldine Jeandel, C. Brisset, Laurence Amouroux, David Besson, Thierry Donard, Olivier François Xavier Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean |
topic_facet |
iron hydrogen peroxide Indian Ocean South Atlantic phytoplankton sea water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Total dissolvable iron (TDFe), particulate iron (PFe) and hydrogen peroxide (H2O2 measurements were performed along a N-S transect in the upper 250 m in the Southern Ocean (62°00E/66°42S–49°00S, ANTARES II cruise, February 1994). TDFe was organically extracted (APDC/DDDC-chloroform) and analysed by Graphite Furnace Atomic Absorption Spectrometry (GFAAS), PFe was analysed by GFAAS following a strong mixed-acid leach, and H2O2 was analysed on board by fluorometry. The respective detection limits are equal to 0.13 nmol/kg, 0.02 nmol/kg, and 3.0 nmol/kg. TDFe concentrations vary from 0.4 to 6.2 nmol/kg and profiles are not completely depleted in the surface. PFe concentrations vary from 0.02 to 0.2 nmol/kg. Iron/carbon (Fe/C) uptake ratios for phytoplankton were calculated either from seawater or particle measurements. They are variable along the transect but are consistent when they could be compared. All the observed ratios are within the range of values proposed for the Fe/C uptake ratios by phytoplankton. Using our uptake ratio calculated in the Permanent Open Ocean Zone (4 · 10−6 mol/mol), we estimate that the primary production which can be supported by the iron input flux into the surface waters is two times higher than the measured primary production in the same area. In the surface waters, H2O2 concentrations vary from 5.0 to 19.7 nmol/kg. Such low concentrations are due to strong vertical mixing, low dissolved organic matter concentrations and the latitude of the site. |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Sarthou, Géraldine Jeandel, C. Brisset, Laurence Amouroux, David Besson, Thierry Donard, Olivier François Xavier |
author_facet |
Sarthou, Géraldine Jeandel, C. Brisset, Laurence Amouroux, David Besson, Thierry Donard, Olivier François Xavier |
author_sort |
Sarthou, Géraldine |
title |
Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean |
title_short |
Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean |
title_full |
Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean |
title_fullStr |
Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean |
title_full_unstemmed |
Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean |
title_sort |
fe and h2o2 distributions in the upper water column in the indian sector of the southern ocean |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.univ-brest.fr/hal-00456475 https://doi.org/10.1016/S0012-821X(97)00004-6 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.univ-brest.fr/hal-00456475 Earth and Planetary Science Letters, 1998, 147 (1-4), pp.83-92. ⟨10.1016/S0012-821X(97)00004-6⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(97)00004-6 hal-00456475 https://hal.univ-brest.fr/hal-00456475 doi:10.1016/S0012-821X(97)00004-6 |
op_doi |
https://doi.org/10.1016/S0012-821X(97)00004-6 |
container_title |
Earth and Planetary Science Letters |
container_volume |
147 |
container_issue |
1-4 |
container_start_page |
83 |
op_container_end_page |
92 |
_version_ |
1785575303371816960 |