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Interannual properties of the CO2 system in the Southern Ocean south of Australia

Published online by Cambridge University Press:  12 August 2009

H.E. Laika ,
C. Goyet ,
F. Vouve ,
A. Poisson  and
F. Touratier
H.E. Laika
Affiliation:
Institut de Modélisation et d’Analyses en Géo-Environnement et Santé, Université de Perpignan Via Domitia, EA 4218 - 52 avenue Paul Alduy, 66860 Perpignan, France
C. Goyet*
Affiliation:
Institut de Modélisation et d’Analyses en Géo-Environnement et Santé, Université de Perpignan Via Domitia, EA 4218 - 52 avenue Paul Alduy, 66860 Perpignan, France
F. Vouve
Affiliation:
Institut de Modélisation et d’Analyses en Géo-Environnement et Santé, Université de Perpignan Via Domitia, EA 4218 - 52 avenue Paul Alduy, 66860 Perpignan, France
A. Poisson
Affiliation:
Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN/IPSL), Université Pierre et Marie Curie, Paris, France
F. Touratier
Affiliation:
Institut de Modélisation et d’Analyses en Géo-Environnement et Santé, Université de Perpignan Via Domitia, EA 4218 - 52 avenue Paul Alduy, 66860 Perpignan, France
*
*corresponding author: cgoyet@univ_perp.fr
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Abstract

In order to quantify the temporal variations of ocean properties, the MINERVE programme was designed to perform time-series measurements in the Southern Indian Ocean south of Australia. In the sub-Antarctic region (SAR, 48.5 ± 6.0°S), the mean CO2 flux increased from spring to summer from -6.8 mmol.m-2.d-1 in October 2005 to -9.9 mmol.m-2.d-1 in February 2006. In the Permanent Open Ocean Zone (POOZ, 57.5 ± 3.0°S), we observed lower pCO2 in summer than in spring (340 and 398 μatm, respectively). The mean CO2 flux showed large temporal variations from -0.2 mmol.m-2.d-1 in October 2005 to -8.2 mmol.m-2.d-1 in February 2006. The large temporal variation was associated with increased phytoplankton biomass. In the Continental Antarctic Zone (66.0 ± 1.0°S), the mean CO2 flux decreased from +14.9 mmol.m-2.d-1 in October 2005 to -8.4 mmol.m-2.d-1 in February 2006. In winter and spring, deep water mixing and seasonal sea-ice strongly increase pCO2sea above atmospheric level. In contrast, during summer, the effect of biological CO2 uptake decreased pCO2sea. Furthermore, these data allowed us to parameterize AT and CT as a function of temperature and salinity.

Keywords

air-sea CO2 fluxpartial pressure of CO2total alkalinitytotal dissolved inorganic carbon
Type
Physical Sciences
Information
Antarctic Science , Volume 21 , Issue 6 , December 2009 , pp. 663 - 680
Copyright
Copyright © Antarctic Science Ltd 2009

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