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  Separation of atmosphere-ocean-vegetation feedbacks and synergies for mid-Holocene climate

Otto, J., Raddatz, T., Claussen, M., Brovkin, V., & Gayler, V. (2009). Separation of atmosphere-ocean-vegetation feedbacks and synergies for mid-Holocene climate. Geophysical Research Letters, 36: L09701. doi:10.1029/2009GL037482.

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 Creators:
Otto, J.1, 2, 3, Author           
Raddatz, T.4, Author           
Claussen, M.1, 5, Author                 
Brovkin, V.2, Author                 
Gayler, V.2, Author                 
Affiliations:
1Director’s Research Group LES, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913564              
2Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913566              
3IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, ou_913547              
4Global Vegetation Modelling, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913562              
5A 2 - Climate Processes and Feedbacks, Research Area A: Climate Dynamics and Variability, The CliSAP Cluster of Excellence, External Organizations, Bundesstraße 53, 20146 Hamburg, DE, ou_1863497              

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 Abstract: We determine both the impact of atmosphere‐ocean and atmosphere‐vegetation feedback, and their synergy on northern latitude climate in response to the orbitally‐induced changes in mid‐Holocene insolation. For this purpose, we present results of eight simulations using the general circulation model ECHAM5‐MPIOM including the land surface scheme JSBACH with a dynamic vegetation module. The experimental set‐up allows us to apply a factor‐separation technique to isolate the contribution of dynamic Earth system components (atmosphere, atmosphere‐ocean, atmosphere‐vegetation, atmosphere‐ocean‐vegetation) to the total climate change signal. Moreover, in order to keep the definition of seasons consistent with insolation forcing, we define the seasons on an astronomical basis. Our results reveal that north of 40°N atmosphere‐vegetation feedback (maximum in spring of 0.08°C) and synergistic effects (maximum in winter of 0.25°C) are weaker than in previous studies. The most important modification of the orbital forcing is related to the atmosphere‐ocean component (maximum in autumn of 0.78°C).

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Language(s): eng - English
 Dates: 2009-05
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: eDoc: 429993
DOI: 10.1029/2009GL037482.
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Title: Geophysical Research Letters
Source Genre: Journal
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Pages: - Volume / Issue: 36 Sequence Number: L09701 Start / End Page: - Identifier: -