Does sedimentary organic delta 13C record variations in quaternary ocean [CO2(aq)]? |
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Authors: | Rau G H Froelich P N Takahashi T Des Marais D J |
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Institution: | Institute of Marine Sciences, University of California, Santa Cruz, USA. |
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Abstract: | Ocean surface water CO2(aq)] variations based on glacial/interglacial changes in sediment delta 13Corg are shown to compare favorably with reconstructions based on ice core CO2]. In particular, an approximate 80 microatmospheres increase in atmospheric pCO2 during the last glacial-interglacial transition is calculated to correspond to a 3-4 micromolar increase in ocean surface water CO2(aq)] at atmospheric equilibrium. A widespread marine delta 13Corg decrease of 1-2% accompanied this event and was not preceded by an equivalent isotopic change in surface water total dissolved inorganic carbon. These observations support the hypothesis that CO2(aq)] influences photosynthetic isotope fractionation between marine inorganic and organic carbon pools, and therefore that plankton/sediment delta 13Corg may serve as a proxy for surface water CO2(aq)]. |
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