The influence of air and sea exchange on the carbon isotope distribution in the sea
Authors:
- Wallace S. BroeckerWBWallace S. Broecker
- Ernst Maier‐ReimerEMErnst Maier‐Reimer
- 21 September 1992
- journal article
- Published by American Geophysical Union (AGU) in Global Biogeochemical Cycles
- Vol. 6 (3) , 315-320
Abstract
We explore here the influence of the temperature dependence of isotope fractionation between atmospheric CO2and ocean ΣCO2 on the distribution of carbon isotopes in the ocean. This is accomplished by an analysis of departures from the expected Redfield tie between PO4 and δ13C. We find that for the surface ocean, the temperature influence largely compensates for the biologic influence. In the deep ocean, the temperature influence imprinted at the sites of deepwater formation reduces somewhat the biologically induced difference between the carbon isotope ratios for deep waters produced in the northern Atlantic and in the Antarctic. These same features are reproduced in the Hamburg ocean model. In order to assess the impact of changes in the ratio of ocean mixing rate to wind speed, we have made a model run in which CO2 exchange rates between air and sea were everywhere doubled. As expected, the influence of the thermodynamic effect on the oceanic carbon isotope distribution is magnified.Keywords
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