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| Titel |
Transitivity of the climate–vegetation system in a warm climate |
| VerfasserIn |
U. Port, M. Claussen |
| 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 ; 11, no. 11 ; Nr. 11, no. 11 (2015-11-25), S.1563-1574 |
| Datensatznummer |
250117460
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| Publikation (Nr.) |
 copernicus.org/cp-11-1563-2015.pdf |
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| Zusammenfassung |
| To date, the transitivity of the global system has been analysed for late
Quaternary (glacial, interglacial, and present-day) climate. Here, we extend
this analysis to a warm, almost ice-free climate with a different
configuration of continents. We use the Earth system model of the Max Planck
Institute for Meteorology to analyse the stability of the climate system
under early Eocene and pre-industrial conditions. We initialize
the simulations by prescribing either dense forests or bare deserts on all
continents. Starting with desert continents, an extended desert remains in
central Asia in the early Eocene climate. Starting with dense forest
coverage, the Asian desert is much smaller, while coastal deserts develop in
the Americas which appear to be larger than in the simulations with initially
bare continents. These differences can be attributed to differences in the
large-scale tropical circulation. With initially forested continents, a
stronger dipole in the 200 hPa velocity potential develops than in the
simulation with initially bare continents. This difference prevails when
vegetation is allowed to adjust to and interact with climate. Further
simulations with initial surface conditions that differ in the region of the
Asian desert only indicate that local feedback processes are less important
in the development of multiple states. In the interglacial, pre-industrial
climate, multiple states develop only in the Sahel region. There, local
climate–vegetation interaction seems to dominate. |
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