Variabilité spatio-temporelle des flux air-mer de CO2 dans l'océan sud : apport des mesures satellitaires

Abstract : We study the variability of oceanic CO2 partial pressure (pCO2) with respect to remotely sensed parameters (sea surface temperature and ocean color) in order to gain an insight into small-scale variability of pCO2 and to monitor the air-sea CO2 flux at a regional scale using satellite measurements. We analyse the space and time variability of the air-sea CO2 flux in the southern ocean, south of Tasmania and New Zealand. We combine in situ measurements and satellite data to compute the CO2 flux from December 1997 to December 1998. We evidence a negative correlation between in situ pCO2 and chlorophyll in case chlorophyll content above 0.37 mg m-3 and in chlorophyll-poor region, pCO2 is mostly negatively correlated with sea surface temperature. We then compute pCO2 and CO2 fluxes fields from satellite measurements (sea surface temperature and ocean color) using the relationships deduced from this study with the exchange CO2 coefficients derived from satellite wind speed. We find an annual absorbed flux of -0.08 GtC year-1. This absorbing flux is less than that computed from the [Takahashi et al, 2002] climatological mean distribution of air-sea CO2 partial pressure gradient with the same exchange coefficient (-0.13 GtC year-1).
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Yvan Rangama. Variabilité spatio-temporelle des flux air-mer de CO2 dans l'océan sud : apport des mesures satellitaires. Autre. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00007529⟩

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