Impact of terrestrial biosphere carbon exchanges on the anomalous CO2 increase in 2002-2003
(2007) In Geophysical Research Letters 34(9).- Abstract
Understanding the carbon dynamics of the terrestrial biosphere during climate fluctuations is a prerequisite for any reliable modeling of the climate-carbon cycle feedback. We drive a terrestrial vegetation model with observed climate data to show that most of the fluctuations in atmospheric CO2 are consistent with the modeled shift in the balance between carbon uptake by terrestrial plants and carbon loss through soil and plant respiration. Simulated anomalies of the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) during the last two El Niño events also agree well with satellite observations. Our model results suggest that changes in net primary productivity (NPP) are mainly responsible for the observed... (More)
Understanding the carbon dynamics of the terrestrial biosphere during climate fluctuations is a prerequisite for any reliable modeling of the climate-carbon cycle feedback. We drive a terrestrial vegetation model with observed climate data to show that most of the fluctuations in atmospheric CO2 are consistent with the modeled shift in the balance between carbon uptake by terrestrial plants and carbon loss through soil and plant respiration. Simulated anomalies of the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) during the last two El Niño events also agree well with satellite observations. Our model results suggest that changes in net primary productivity (NPP) are mainly responsible for the observed anomalies in the atmospheric CO2 growth rate. Changes in heterotrophic respiration (Rh) mostly happen in the same direction, but with smaller amplitude. We attribute the unusual acceleration of the atmospheric CO2 growth rate during 2002-2003 to a coincidence of moderate El Niño conditions in the tropics with a strong NPP decrease at northern mid latitudes, only partially compensated by decreased Rh.
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- author
- Knorr, Wolfgang LU ; Gobron, N. ; Scholze, M. LU ; Kaminski, T. ; Schnur, R. and Pinty, B.
- publishing date
- 2007-05-16
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geophysical Research Letters
- volume
- 34
- issue
- 9
- article number
- L09703
- publisher
- American Geophysical Union (AGU)
- external identifiers
-
- scopus:34347254197
- ISSN
- 0094-8276
- DOI
- 10.1029/2006GL029019
- language
- English
- LU publication?
- no
- id
- f552fb04-8978-4059-8ee4-a085ed6c093e
- date added to LUP
- 2019-03-14 21:26:23
- date last changed
- 2024-02-09 13:51:50
@article{f552fb04-8978-4059-8ee4-a085ed6c093e, abstract = {{<p>Understanding the carbon dynamics of the terrestrial biosphere during climate fluctuations is a prerequisite for any reliable modeling of the climate-carbon cycle feedback. We drive a terrestrial vegetation model with observed climate data to show that most of the fluctuations in atmospheric CO<sub>2</sub> are consistent with the modeled shift in the balance between carbon uptake by terrestrial plants and carbon loss through soil and plant respiration. Simulated anomalies of the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) during the last two El Niño events also agree well with satellite observations. Our model results suggest that changes in net primary productivity (NPP) are mainly responsible for the observed anomalies in the atmospheric CO<sub>2</sub> growth rate. Changes in heterotrophic respiration (R<sub>h</sub>) mostly happen in the same direction, but with smaller amplitude. We attribute the unusual acceleration of the atmospheric CO<sub>2</sub> growth rate during 2002-2003 to a coincidence of moderate El Niño conditions in the tropics with a strong NPP decrease at northern mid latitudes, only partially compensated by decreased R<sub>h</sub>.</p>}}, author = {{Knorr, Wolfgang and Gobron, N. and Scholze, M. and Kaminski, T. and Schnur, R. and Pinty, B.}}, issn = {{0094-8276}}, language = {{eng}}, month = {{05}}, number = {{9}}, publisher = {{American Geophysical Union (AGU)}}, series = {{Geophysical Research Letters}}, title = {{Impact of terrestrial biosphere carbon exchanges on the anomalous CO<sub>2</sub> increase in 2002-2003}}, url = {{http://dx.doi.org/10.1029/2006GL029019}}, doi = {{10.1029/2006GL029019}}, volume = {{34}}, year = {{2007}}, }