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Climate and interannual variability of the atmosphere-biosphere 13CO2 flux

Scholze, M. LU ; Kaplan, J. O. LU ; Knorr, W. LU and Heimann, M. (2003) In Geophysical Research Letters 30(2).
Abstract

We present a bottom-up approach to simulate the terrestriál isotopic carbon variations using the Lund-Postsdam-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... (More)

We present a bottom-up approach to simulate the terrestriál isotopic carbon variations using the Lund-Postsdam-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.

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author
; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Geophysical Research Letters
volume
30
issue
2
publisher
American Geophysical Union (AGU)
external identifiers
  • scopus:0038266112
ISSN
0094-8276
DOI
10.1029/2002GL015631
language
English
LU publication?
no
id
64e590d9-d566-4133-a39f-d1c8f05dc5d4
date added to LUP
2019-03-14 21:31:45
date last changed
2024-02-09 13:51:51
@article{64e590d9-d566-4133-a39f-d1c8f05dc5d4,
  abstract     = {{<p>We present a bottom-up approach to simulate the terrestriál isotopic carbon variations using the Lund-Postsdam-Jena dynamic global vegetation model (LPJ-DGVM). LPJ is extended to include isotopic fractionation of <sup>13</sup>C 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 CO<sub>2</sub> and <sup>13</sup>CO<sub>2</sub> with the atmosphere as a function of changes in climate, atmospheric CO<sub>2</sub>, and the isotope ratio of CO<sub>2</sub>. 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 <sup>13</sup>CO<sub>2</sub> flux between atmosphere and terrestrial biosphere is of the order of 15 PgC‰ yr<sup>-1</sup>. It is reduced to 4 PgC‰ yr<sup>-1</sup> 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<sup>-1</sup> in the inferred partitioning between terrestrial and oceanic carbon sinks.</p>}},
  author       = {{Scholze, M. and Kaplan, J. O. and Knorr, W. and Heimann, M.}},
  issn         = {{0094-8276}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{2}},
  publisher    = {{American Geophysical Union (AGU)}},
  series       = {{Geophysical Research Letters}},
  title        = {{Climate and interannual variability of the atmosphere-biosphere <sup>13</sup>CO<sub>2</sub> flux}},
  url          = {{http://dx.doi.org/10.1029/2002GL015631}},
  doi          = {{10.1029/2002GL015631}},
  volume       = {{30}},
  year         = {{2003}},
}