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G-Cubed: Geochemistry, Geophysics, Geosystems

 

Keywords

  • Biosphere
  • carbon cycle
  • CO 2δ 13C
  • glacial-interglacial changes
  • modeling

Index Terms

  • Atmospheric Composition and Structure: Biosphere/atmosphere interactions
  • Global Change: Biogeochemical processes
  • Oceanography: Biological and Chemical: Ecosystems, structure and dynamics
  • Oceanography: Biological and Chemical: Stable isotopes
Abstract
Cited By (7)
 

Abstract

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, VOL. 3, 1027, 15 PP., 2002
doi:10.1029/2001GC000270 [Citation]

Ocean biology could control atmospheric δ13C during glacial-interglacial cycle

Victor Brovkin

Potsdam Institute for Climate Impact Research, Potsdam, P. O. Box 601203, 14412 Germany

Matthias Hofmann

Potsdam Institute for Climate Impact Research, Potsdam, P. O. Box 601203, 14412 Germany

Jørgen Bendtsen

Niels Bohr Institute for Astronomy, Physics and Geophysics, Danish Center for Earth System Science, Blegdamsvej 17, Copenhagen, DK-2100 Denmark

Andrey Ganopolski

Potsdam Institute for Climate Impact Research, P. O. Box 601203, Potsdam, 14412 Germany

Estimates of changes in the global carbon budget are often based on the assumption that the terrestrial biosphere controls the isotopic composition of atmospheric CO2 since terrestrial plants discriminate against the 13C isotope during photosynthesis. However, this method disregards the influence of 13C fractionation by the marine biota. Here an interpretation of the glacial-interglacial shifts in the atmospheric CO2 concentration and δ13CO2 measured in the Taylor Dome ice core [ Smith et al., 1999 ] is given by accounting for possible changes in the ocean biology based on sensitivity simulations undertaken with the intermediate complexity model CLIMBER-2. With a combined scenario of enhanced biological and solubility pumps, the model simulates glacial atmospheric CO2 and δ13CO2 similar to those inferred from the ice core. The simulations reveal that a strengthening of the oceanic biological carbon pump considerably affects the atmospheric δ13CO2.

Received 13 November 2001; accepted 11 February 2002; published 22 May 2002.

Citation: Brovkin, V., M. Hofmann, J. Bendtsen, and A. Ganopolski (2002), Ocean biology could control atmospheric δ13C during glacial-interglacial cycle, Geochem. Geophys. Geosyst., 3(5), 1027, doi:10.1029/2001GC000270.

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