Holocene carbon cycle dynamics
We are investigating the late Holocene rise in CO 2 by performing four experiments with the climate-carbon-cycle model CLIMBER2-LPJ. Apart from the deep sea sediments, important carbon cycle processes considered are carbon uptake or release by the vegetation, carbon uptake by peatlands, and CO 2 rel...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.7312 http://www.beunder.com/pdf/Kleinen_etal_20091201.pdf |
| Summary: | We are investigating the late Holocene rise in CO 2 by performing four experiments with the climate-carbon-cycle model CLIMBER2-LPJ. Apart from the deep sea sediments, important carbon cycle processes considered are carbon uptake or release by the vegetation, carbon uptake by peatlands, and CO 2 release due to shallow water sedimentation of CaCO 3 . Ice core data of atmospheric CO 2 between 8 ka BP and preindustrial climate can only be reproduced if CO 2 outgassing due to shallow water sedimentation of CaCO 3 is considered. In this case the model displays an increase of nearly 20 ppmv CO 2 between 8 ka BP and present day. Model configurations that do not contain this forcing show a slight decrease in atmospheric CO 2 . We can therefore explain the late Holocene rise in CO 2 by invoking natural forcing factors only, and anthropogenic forcing is not required to understand preindustrial CO 2 dynamics. |
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