EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Scholze et al. 2003
Scholze, M., Kaplan, J.O., Knorr, W. and Heimann, M. (2003). Climate and interannual variability of the atmosphere-biosphere 13CO2 flux. Geophysical Research Letters 30: doi: 10.1029/2002GL015631. issn: 0094-8276.

We present a bottom-up approach to simulate the terrestrial isotopic carbon variations using the Lund-Potsdam-Jena dynamic global vegetation model (LPJ-DGVM). LPJ is extended to include isotopic fractionation of 13C at the leaf level during assimilation and includes a full isotopic terrestrial carbon cycle. The model thus allows a quantitative analysis of the net biosphere exchange of CO2 and 13CO2 with the atmosphere as a function of changes in climate, atmospheric CO2, and the isotope ratio of CO2. LPJ simulates a global mean isotopic fractionation of 17.7? at the leaf level with interannual variations of ca. 0.3?. Interannual variability in the net 13CO2 flux between atmosphere and terrestrial biosphere is of the order of 15 PgC? yr-1. It is reduced to 4 PgC? yr-1 if the leaf-level fractionation factor is held constant at the long term mean. Taking climate driven variable fractionation effects into account in double deconvolution studies we estimate that this could imply shifts of up to 0.8 PgC yr-1 in the inferred partitioning between terrestrial and oceanic carbon sinks.

BACKGROUND DATA FILES

Abstract

Keywords
Global Change, Biogeochemical processes, Atmospheric Composition and Structure, Constituent sources and sinks, Atmospheric Composition and Structure, Biosphere/atmosphere interactions
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit