Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period
Paleo-environmental records and models indicate that the African Humid Period (AHPabruptly ended about 5000-4000 years before present (BP). Some proxies indicate alsan abrupt onset of the AHP between 14,000 and 11,000 BP. How important are local orbitaforcing, ice-sheet forcing, greenhouse gas forci...
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ftawi:oai:epic.awi.de:18480 2023-05-15T16:40:48+02:00 Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period Timm, O. Köhler, Peter Timmermann, A. Menviel, L. 2008 application/pdf https://epic.awi.de/id/eprint/18480/ https://epic.awi.de/id/eprint/18480/1/Tim2008b.pdf https://hdl.handle.net/10013/epic.30137 https://hdl.handle.net/10013/epic.30137.d001 unknown https://epic.awi.de/id/eprint/18480/1/Tim2008b.pdf https://hdl.handle.net/10013/epic.30137.d001 Timm, O. , Köhler, P. orcid:0000-0003-0904-8484 , Timmermann, A. and Menviel, L. (2008) Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period , The Leverhulme Climate Symposium 2008. Earth's Climate: Past, Present and Future. University of Cambridge and the Royal Society, London, 10th - 13th March 2008. . hdl:10013/epic.30137 EPIC3The Leverhulme Climate Symposium 2008. Earth's Climate: Past, Present and Future. University of Cambridge and the Royal Society, London, 10th - 13th March 2008. Conference notRev 2008 ftawi 2021-12-24T15:32:36Z Paleo-environmental records and models indicate that the African Humid Period (AHPabruptly ended about 5000-4000 years before present (BP). Some proxies indicate alsan abrupt onset of the AHP between 14,000 and 11,000 BP. How important are local orbitaforcing, ice-sheet forcing, greenhouse gas forcing, and the reorganization of the AtlantiMeridional Overturning Circulation (AMOC) for changes in the African Monsoon/vegetatiosystem? Here we use transient simulations with climate-vegetation models of differencomplexity to identify the factors that control the onset of the African Monsoon/VegetationWe test the following hypothesis:(1) There is no indication for insolation-thresholds for the onset/break of the AHP.(2) Forcing from CO2/ice-sheets significantly controls the climate of North Africa.(3) CO2 fertilization contributes to the vegetation changes over North Africa.(4) A shutdown of the AMOC is as important as orbital insolation for the African Monsoon. Conference Object Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Paleo-environmental records and models indicate that the African Humid Period (AHPabruptly ended about 5000-4000 years before present (BP). Some proxies indicate alsan abrupt onset of the AHP between 14,000 and 11,000 BP. How important are local orbitaforcing, ice-sheet forcing, greenhouse gas forcing, and the reorganization of the AtlantiMeridional Overturning Circulation (AMOC) for changes in the African Monsoon/vegetatiosystem? Here we use transient simulations with climate-vegetation models of differencomplexity to identify the factors that control the onset of the African Monsoon/VegetationWe test the following hypothesis:(1) There is no indication for insolation-thresholds for the onset/break of the AHP.(2) Forcing from CO2/ice-sheets significantly controls the climate of North Africa.(3) CO2 fertilization contributes to the vegetation changes over North Africa.(4) A shutdown of the AMOC is as important as orbital insolation for the African Monsoon. |
format |
Conference Object |
author |
Timm, O. Köhler, Peter Timmermann, A. Menviel, L. |
spellingShingle |
Timm, O. Köhler, Peter Timmermann, A. Menviel, L. Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period |
author_facet |
Timm, O. Köhler, Peter Timmermann, A. Menviel, L. |
author_sort |
Timm, O. |
title |
Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period |
title_short |
Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period |
title_full |
Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period |
title_fullStr |
Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period |
title_full_unstemmed |
Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period |
title_sort |
climate-vegetation-feedbacks as a mechanism for accelerated climate change: the onset of the african humid period |
publishDate |
2008 |
url |
https://epic.awi.de/id/eprint/18480/ https://epic.awi.de/id/eprint/18480/1/Tim2008b.pdf https://hdl.handle.net/10013/epic.30137 https://hdl.handle.net/10013/epic.30137.d001 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
EPIC3The Leverhulme Climate Symposium 2008. Earth's Climate: Past, Present and Future. University of Cambridge and the Royal Society, London, 10th - 13th March 2008. |
op_relation |
https://epic.awi.de/id/eprint/18480/1/Tim2008b.pdf https://hdl.handle.net/10013/epic.30137.d001 Timm, O. , Köhler, P. orcid:0000-0003-0904-8484 , Timmermann, A. and Menviel, L. (2008) Climate-Vegetation-Feedbacks as a Mechanism for Accelerated Climate Change: The onset of the African Humid Period , The Leverhulme Climate Symposium 2008. Earth's Climate: Past, Present and Future. University of Cambridge and the Royal Society, London, 10th - 13th March 2008. . hdl:10013/epic.30137 |
_version_ |
1766031230544904192 |