Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand
International audience We determine the distribution of oceanic CO 2 partial pressure (pCO 2 ) with respect to remotely sensed parameters (sea surface temperature (SST) and chlorophyll (Chl)) in order to gain an understanding of the small-scale (10-100 km) pCO 2 variability and to estimate the net a...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2005
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Subjects: | |
Online Access: | https://hal.science/hal-00124824 https://hal.science/hal-00124824/document https://hal.science/hal-00124824/file/2004JC002619.pdf https://doi.org/10.1029/2004JC002619 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes Rangama, Yvan Boutin, Jacqueline Etcheto, Jacqueline Merlivat, Liliane Takahashi, Taro Delille, Bruno Frankignoulle, M. Bakker, Dorothee C. E. Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience We determine the distribution of oceanic CO 2 partial pressure (pCO 2 ) with respect to remotely sensed parameters (sea surface temperature (SST) and chlorophyll (Chl)) in order to gain an understanding of the small-scale (10-100 km) pCO 2 variability and to estimate the net air-sea CO 2 flux in the region (125°E-205°E; 45°S-60°S), which represents 22% of the Southern Ocean area between 45°S and 60°S. We split the study area into several biogeochemical provinces. In chlorophyll-poor regions, pCO 2 is negatively correlated with SST, indicating that pCO 2 is mostly controlled by mixing processes. For Chl > 0.37 mg m 3 , pCO 2 is negatively correlated with Chl, indicating that pCO 2 variability is mostly controlled by carbon fixation by biological activity. We deduce fields of pCO 2 and of air-sea CO 2 fluxes from satellite parameters using pCO 2 -SST, pCO 2 -chlorophyll relationships and air-sea gas exchange coefficient, K, from satellite wind speed. We estimate an oceanic CO 2 sink from December 1997 to December 1998 of À0.08 GtC yr -1 with an error of 0.03 GtC yr -1 . This sink is approximately 38% smaller than that computed from the Takahashi et al. (2002) climatological distribution of DpCO 2 for the 1995 year but with the same K (-0.13 GtC yr -1 ). When we correct ocean pCO 2 for the interannual variability between 1995 and 1998, the difference is even larger, and we cannot reconcile both estimates in February-March and from June to November. This strengthens the need of new in situ measurements for validating extrapolation methods and for improving knowledge of interannual pCO 2 variability. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Lamont-Doherty Earth Observatory (LDEO) Columbia University New York Unité d'Océanographie Chimique Interfacultary Center for Marine Research (MARE) Université de Liège-Université de Liège School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) |
format |
Article in Journal/Newspaper |
author |
Rangama, Yvan Boutin, Jacqueline Etcheto, Jacqueline Merlivat, Liliane Takahashi, Taro Delille, Bruno Frankignoulle, M. Bakker, Dorothee C. E. |
author_facet |
Rangama, Yvan Boutin, Jacqueline Etcheto, Jacqueline Merlivat, Liliane Takahashi, Taro Delille, Bruno Frankignoulle, M. Bakker, Dorothee C. E. |
author_sort |
Rangama, Yvan |
title |
Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand |
title_short |
Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand |
title_full |
Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand |
title_fullStr |
Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand |
title_full_unstemmed |
Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand |
title_sort |
variability of the net air-sea co 2 flux inferred from shipboard and satellite measurements in the southern ocean south of tasmania and new zealand |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00124824 https://hal.science/hal-00124824/document https://hal.science/hal-00124824/file/2004JC002619.pdf https://doi.org/10.1029/2004JC002619 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00124824 Journal of Geophysical Research, 2005, 110, pp.C09005. ⟨10.1029/2004JC002619⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2004JC002619 hal-00124824 https://hal.science/hal-00124824 https://hal.science/hal-00124824/document https://hal.science/hal-00124824/file/2004JC002619.pdf doi:10.1029/2004JC002619 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2004JC002619 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
C9 |
_version_ |
1799467311540731904 |
spelling |
ftsorbonneuniv:oai:HAL:hal-00124824v1 2024-05-19T07:48:55+00:00 Variability of the net air-sea CO 2 flux inferred from shipboard and satellite measurements in the Southern Ocean south of Tasmania and New Zealand Rangama, Yvan Boutin, Jacqueline Etcheto, Jacqueline Merlivat, Liliane Takahashi, Taro Delille, Bruno Frankignoulle, M. Bakker, Dorothee C. E. Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Lamont-Doherty Earth Observatory (LDEO) Columbia University New York Unité d'Océanographie Chimique Interfacultary Center for Marine Research (MARE) Université de Liège-Université de Liège School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) 2005 https://hal.science/hal-00124824 https://hal.science/hal-00124824/document https://hal.science/hal-00124824/file/2004JC002619.pdf https://doi.org/10.1029/2004JC002619 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2004JC002619 hal-00124824 https://hal.science/hal-00124824 https://hal.science/hal-00124824/document https://hal.science/hal-00124824/file/2004JC002619.pdf doi:10.1029/2004JC002619 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00124824 Journal of Geophysical Research, 2005, 110, pp.C09005. ⟨10.1029/2004JC002619⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2005 ftsorbonneuniv https://doi.org/10.1029/2004JC002619 2024-04-25T03:59:36Z International audience We determine the distribution of oceanic CO 2 partial pressure (pCO 2 ) with respect to remotely sensed parameters (sea surface temperature (SST) and chlorophyll (Chl)) in order to gain an understanding of the small-scale (10-100 km) pCO 2 variability and to estimate the net air-sea CO 2 flux in the region (125°E-205°E; 45°S-60°S), which represents 22% of the Southern Ocean area between 45°S and 60°S. We split the study area into several biogeochemical provinces. In chlorophyll-poor regions, pCO 2 is negatively correlated with SST, indicating that pCO 2 is mostly controlled by mixing processes. For Chl > 0.37 mg m 3 , pCO 2 is negatively correlated with Chl, indicating that pCO 2 variability is mostly controlled by carbon fixation by biological activity. We deduce fields of pCO 2 and of air-sea CO 2 fluxes from satellite parameters using pCO 2 -SST, pCO 2 -chlorophyll relationships and air-sea gas exchange coefficient, K, from satellite wind speed. We estimate an oceanic CO 2 sink from December 1997 to December 1998 of À0.08 GtC yr -1 with an error of 0.03 GtC yr -1 . This sink is approximately 38% smaller than that computed from the Takahashi et al. (2002) climatological distribution of DpCO 2 for the 1995 year but with the same K (-0.13 GtC yr -1 ). When we correct ocean pCO 2 for the interannual variability between 1995 and 1998, the difference is even larger, and we cannot reconcile both estimates in February-March and from June to November. This strengthens the need of new in situ measurements for validating extrapolation methods and for improving knowledge of interannual pCO 2 variability. Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Journal of Geophysical Research 110 C9 |