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  Will the tropical land biosphere dominate the climate-carbon cycle feedback during the twenty-first century?

Raddatz, T. J., Reick, C. H., Knorr, W., Kattge, J., Roeckner, E., Schnur, R., et al. (2007). Will the tropical land biosphere dominate the climate-carbon cycle feedback during the twenty-first century? Climate Dynamics, 29(6), 565-574. doi:10.1007/s00382-007-0247-8.

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BGC1087.pdf (Publisher version), 379KB
 
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 Creators:
Raddatz, T. J.1, Author           
Reick, C. H.1, Author           
Knorr, W.1, Author           
Kattge, Jens2, Author           
Roeckner, E., Author
Schnur, R., Author
Schnitzler, K. G., Author
Wetzel, P., Author
Jungclaus, J., Author
Affiliations:
1Department Biogeochemical Synthesis, Prof. C. Prentice, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497753              
2TRY: Global Initiative on Plant Traits, Dr. J. Kattge, Research Group Organismic Biogeochemistry, Dr. C. Wirth, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497793              

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Free keywords: climate; carbon cycle; feedback; global warming; C4MIP; NPP TERRESTRIAL BIOSPHERE; STOMATAL CONDUCTANCE; VEGETATION MODEL; ATMOSPHERIC CO2; PHOTOSYNTHESIS; UNCERTAINTIES; SENSITIVITY; DIOXIDE; FUTURE; LEAVES
 Abstract: Global warming caused by anthropogenic CO2 emissions is expected to reduce the capability of the ocean and the land biosphere to take up carbon. This will enlarge the fraction of the CO2 emissions remaining in the atmosphere, which in turn will reinforce future climate change. Recent model studies agree in the existence of such a positive climate-carbon cycle feedback, but the estimates of its amplitude differ by an order of magnitude, which considerably increases the uncertainty in future climate projections. Therefore we discuss, in how far a particular process or component of the carbon cycle can be identified, that potentially contributes most to the positive feedback. The discussion is based on simulations with a carbon cycle model, which is embedded in the atmosphere/ocean general circulation model ECHAM5/MPI-OM. Two simulations covering the period 1860-2100 are conducted to determine the impact of global warming on the carbon cycle. Forced by historical and future carbon dioxide emissions (following the scenario A2 of the Intergovernmental Panel on Climate Change), they reveal a noticeable positive climate-carbon cycle feedback, which is mainly driven by the tropical land biosphere. The oceans contribute much less to the positive feedback and the temperate/boreal terrestrial biosphere induces a minor negative feedback. The contrasting behavior of the tropical and temperate/boreal land biosphere is mostly attributed to opposite trends in their net primary productivity (NPP) under global warming conditions. As these findings depend on the model employed they are compared with results derived from other climate-carbon cycle models, which participated in the Coupled Climate-Carbon Cycle Model Intercomparison Project (C4MIP).

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Language(s): eng - English
 Dates: 2007
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1007/s00382-007-0247-8
ISI: ://000249403100002
Other: BGC1087
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Title: Climate Dynamics
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-International
Pages: - Volume / Issue: 29 (6) Sequence Number: - Start / End Page: 565 - 574 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925568800
ISSN: 0930-7575