We analysed the temporal variations of the CO2
system in the Southern Ocean south of Tasmania and compared the seasonality of
the carbon dioxide fugacity (fCO2)
and the air-sea CO2 flux during spring and summer for two different
years: 1996/97 and 2002/03. In summer, the CO2 flux presents large
and contrasting interannual changes in the Permanent Open Ocean Zone (POOZ,
53-61°S): the oceanic CO2 sink varies from about –0.3 mmol.m-2.d-1
in 1997 to –20.6 mmol.m-2.d-1 in 2003. This strong sink in
February 2003 was related to an increased phytoplankton biomass in this
high-nutrient, low-chlorophyll (HNLC) region.
Author: E. Brévière, A. Poisson, B. Tilbrook, N. Metzl, et al (breviere at ccr dot jussieu dot fr)
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