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Contribution à l'étude du système des carbonates en Méditerranée-Distribution et variation spatio-temporelle de la pression partielle de CO2 dans les eaux superficielles du bassin Liguro-Provençal

Abstract : Approximately 60% of the anthropogenically produced carbon dioxide (CO2) currently accumulates in the atmosphere, with the remainder transferred largely to the ocean. The magnitude of the oceanic sink is uncertain. Several models have predicted an increase in the upper layer ocean carbon dioxide content, but the oceanic CO2 uptake is poorly constrained due to sparse pCO2 datasets on relevant time and space scales. Actually, physical and biological processes contribute to the large spatial and temporal variability of pCO2. The example of a semi-enclosed sea such as the Mediterranean Sea offers the opportunity of a complete sampling of the various processes controlling the carbon cycle at a global scale. This study is based on two-year's monthly measurements of CO2 system parameters at the Fr-JGOFS Dyfamed site. We observed that seawater pCO2 was highly variable on different timescales, ranging from diel to seasonal. However the annual cycle of pCO2 at Dyfamed was well defined, with a change of about 120 µatm. The quantification of the contributions of the various processes governing the seasonal cycle of pCO2, has led to the establishment of empirical relationships between pCO2 and surface seawater properties. This allows for the extrapolation of the results obtained at the Dyfamed site over wider spatial scales which are not covered by the relevant data, by using remotely sensed measurements. A synthesis of existing transect cruises provides means of assessing the robustness of these pCO2-surface property relationships across the Mediterranean Sea. The major limitation in the prediction of the spatial distribution of pCO2 arises from the lack of data at different seasons over the various basins of the Mediterranean.
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Contributor : Milena Begovic <>
Submitted on : Tuesday, May 6, 2003 - 10:25:58 AM
Last modification on : Wednesday, December 9, 2020 - 3:04:56 PM
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  • HAL Id : tel-00002793, version 1

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Miléna Bégovic. Contribution à l'étude du système des carbonates en Méditerranée-Distribution et variation spatio-temporelle de la pression partielle de CO2 dans les eaux superficielles du bassin Liguro-Provençal. Autre. Université Pierre et Marie Curie - Paris VI, 2001. Français. ⟨tel-00002793⟩

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