Stable isotope analysis of Porites coral core from the Andaman Islands, supplement to: Rixen, Tim; Ramachandran, Purvaja; Lehnhoff, Laura; Dasbach, Dorothee; Gaye, Birgit; Urban, Brigitte; Ramachandran, Ramesh; Ittekkot, Venugopalan (2011): Impact of monsoon-driven surface ocean processes on a co...
North Atlantic climate variations are reflected in sedimentary records from the northern Indian O... more North Atlantic climate variations are reflected in sedimentary records from the northern Indian Ocean in which two basins, the Arabian Sea and the Bay of Bengal, are strongly affected by the monsoon. Contrary to the Bay of Bengal the Arabian Sea plays an important role in the global marine nitrogen cycle. In its mid-water oxygen minimum zone (OMZ) bioavailable fixed nitrogen is reduced to nitrogen gas (NO3- - > N2), whereas oxygen concentrations are slightly above the threshold of nitrate reduction in the OMZ of the Bay of Bengal. A coral colony (Porites lutea) growing south of Port Blair on the Andaman Islands in the Bay of Bengal was studied for its response to changes in the monsoon system and its link to temperature changes in the North Atlantic Ocean, between 1975 and 2006. Its linear extension rates, d13C and d18O values measured within the coral skeleton reveal a strong seasonality, which seems to be caused by the monsoon-driven reversal of the surface ocean circulation. T...
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Papers by Brigitte Urban