Isotopic Signatures of net Carbon Fluxes and Pure Isotopic Exchange Fluxes as Determined From Atmospheric Data.
Abstract
For many years observed del-13C values of atmospheric CO2 have been used to partition net fluxes of carbon to the atmosphere into an oceanic and a terrestrial contribution. Additional information that is necessary is 1) an estimate of the isotopic "signature" (the difference from the atmosphere) of the fluxes, and 2) an estimate of the magnitude of pure isotopic exchange between all three reservoirs that is always taking place, also in the absence of net carbon fluxes. These estimates have traditionally been derived from other data or models. We are exploring a method to derive this information from the atmospheric CO2 and isotopic data themselves, which would be independent of earlier estimates and could help to uncover interannual variations of both the above quantities.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2003
- Bibcode:
- 2003AGUFM.A42D..03T
- Keywords:
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- 0312 Air/sea constituent fluxes (3339;
- 4504);
- 0315 Biosphere/atmosphere interactions;
- 0322 Constituent sources and sinks;
- 0330 Geochemical cycles