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Etude du carbone anthropique dans l'Océan Indien Austral : Distribution et variabilité décennale

Abstract : The Southern Ocean where mode, deep and bottom water are formed has a high capacity for sequestrating anthropogenic carbon. In this study the distribution of anthropogenic carbon in the Southern Ocean was analyzed using different data-based methods. Results deduced from observations collected at the Indian-Atlantic boundary (WOCE/CIVA2) show higher anthropogenic carbon inventories than previous estimates deduced from either observations or ocean models. In addition to the invasion of anthropogenic carbon, the ocean carbon cycle is subjected to the impact of climate change through the modification of dynamical and biogeochemical processes. The analysis of data collected between 1978 and 2001 (GEOSECS, INDIGO, WOCE and OISO) shows that the increase in dissolved inorganic carbon (DIC) in Mode Waters (300-800m) is significant over the two decades. Over the period 1985-2001, it is shown that the variations of DIC observed in these water masses are lower than the increase in anthropogenic carbon. The difference, which is associated with a decrease in oxygen mean concentrations, could be explained by a change primary production in the circumpolar frontal region. The results obtained in our study suggests that there is a need, firstly, to re-evaluate anthropogenic carbon inventories at the scale of the Southern Ocean and, secondly, to better account for the coupling between biogeochemical cycles and climate forcing in order to separate natural variability and anthropogenic impacts in the ocean.
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https://tel.archives-ouvertes.fr/tel-00121242
Contributor : Claire Lo Monaco <>
Submitted on : Tuesday, December 19, 2006 - 8:59:52 PM
Last modification on : Friday, May 29, 2020 - 3:58:49 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:19:04 PM

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  • HAL Id : tel-00121242, version 1

Citation

Claire Lo Monaco. Etude du carbone anthropique dans l'Océan Indien Austral : Distribution et variabilité décennale. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00121242⟩

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