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| Titel |
Results of PMIP2 coupled simulations of the Mid-Holocene and Last Glacial Maximum – Part 2: feedbacks with emphasis on the location of the ITCZ and mid- and high latitudes heat budget |
| VerfasserIn |
P. Braconnot, B. Otto-Bliesner, S. Harrison, S. Joussaume, J.-Y. Peterchmitt, A. Abe-Ouchi, M. Crucifix, E. Driesschaert, Th. Fichefet, C. D. Hewitt, M. Kageyama, A. Kitoh, M.-F. Loutre, O. Marti, U. Merkel, G. Ramstein, P. Valdes, S. L. Weber, Y. Yu, Y. Zhao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 3, no. 2 ; Nr. 3, no. 2 (2007-06-04), S.279-296 |
| Datensatznummer |
250000898
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| Publikation (Nr.) |
 copernicus.org/cp-3-279-2007.pdf |
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| Zusammenfassung |
| A set of coupled ocean-atmosphere(-vegetation) simulations using state of
the art climate models is now available for the Last Glacial Maximum (LGM)
and the Mid-Holocene (MH) through the second phase of the Paleoclimate
Modeling Intercomparison Project (PMIP2). Here we quantify the latitudinal
shift of the location of the Intertropical Convergence Zone (ITCZ) in the
tropical regions during boreal summer and the change in precipitation in the
northern part of the ITCZ. For both periods the shift is more pronounced
over the continents and East Asia. The maritime continent is the region
where the largest spread is found between models. We also clearly establish
that the larger the increase in the meridional temperature gradient in the
tropical Atlantic during summer at the MH, the larger the change in
precipitation over West Africa. The vegetation feedback is however not as
large as found in previous studies, probably due to model differences in the
control simulation. Finally, we show that the feedback from snow and sea-ice
at mid and high latitudes contributes for half of the cooling in the
Northern Hemisphere for the LGM, with the remaining being achieved by the
reduced CO2 and water vapour in the atmosphere. For the MH the snow and
albedo feedbacks strengthen the spring cooling and enhance the boreal summer
warming, whereas water vapour reinforces the late summer warming. These
feedbacks are modest in the Southern Hemisphere. For the LGM most of the
surface cooling is due to CO2 and water vapour. |
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