Article Dans Une Revue Journal of Geophysical Research. Oceans Année : 2001

Oxygen isotope/salinity relationship in the northern Indian Ocean

Résumé

We analyze the surface •5•80-salinity relationships of the Bay of Bengal and the Arabian Sea, in the northern Indian Ocean, known for their contrasting hydrological conditions. New measurements of these tracers show a very low •5•80-salinity slope associated with the strong dilution in the Bay of Bengal, but a slope more typical of this latitude in the Arabian Sea. Although this region is marked by a complex monsoonal regime, numerical modeling using a box model and a general circulation model is able to capture the •5•SO-salinity slope and its geographical variation. Both models clearly show that the low •5•SO-salinity slope is due to the evaporation-minus-precipitation balance, with an important contribution of the continental runoff in the Bay of Bengal. Although the low value of these slopes (-0.25) makes past salinity reconstructions uncertain, insight into the Last Glacial Maximum conditions shows a probable stability of these slopes and limited error on paleosalinity.

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hal-02957968 , version 1 (11-01-2021)

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Gilles Delaygue, Edouard Bard, Claire Rollion, Jean Jouzel, Michel Stiévenard, et al.. Oxygen isotope/salinity relationship in the northern Indian Ocean. Journal of Geophysical Research. Oceans, 2001, 106 (C3), pp.4565-4574. ⟨10.1029/1999JC000061⟩. ⟨hal-02957968⟩
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