HR: 14:10h
AN: A42D-03    [PDF]
TI: Isotopic Signatures of net Carbon Fluxes and Pure Isotopic Exchange Fluxes as Determined From Atmospheric Data.
AU: * Tans, P
EM: Pieter.Tans@noaa.gov
AF: Climate Monitoring and Diagnostics Laboratory, NOAA, Mailcode R/CMDL1 325 Broadway, Boulder, CO 80305-3328 United States
AU: Conway, T
EM: Thomas.J.Conway@noaa.gov
AF: Climate Monitoring and Diagnostics Laboratory, NOAA, Mailcode R/CMDL1 325 Broadway, Boulder, CO 80305-3328 United States
AU: White, J
EM: James.White@colorado.edu
AF: Institute for Arctic and Alpine Research, Univ. of Colorado at Boulder, 3000 Marine Street Campus Box 450, Boulder, CO 80309-0450 United States
AU: Vaughn, B
EM: Bruce.Vaughn@colorado.edu
AF: Institute for Arctic and Alpine Research, Univ. of Colorado at Boulder, 3000 Marine Street Campus Box 450, Boulder, CO 80309-0450 United States
AB: 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.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0330 Geochemical cycles
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting