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| Titel |
Vegetation-climate interactions in the warm mid-Cretaceous |
| VerfasserIn |
J. Zhou, C. J. Poulsen, N. Rosenbloom, C. Shields, B. Briegleb |
| 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 ; 8, no. 2 ; Nr. 8, no. 2 (2012-03-16), S.565-576 |
| Datensatznummer |
250005469
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| Publikation (Nr.) |
 copernicus.org/cp-8-565-2012.pdf |
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| Zusammenfassung |
| Vegetation-climate interactions are thought to have amplified polar warmth
during past warm periods. Here, we explore the vegetation-climate
interactions in the mid-Cretaceous using a fully coupled ocean-atmosphere
general circulation model with a dynamic vegetation component. We run
simulations with 1x, 10x and 16x pre-industrial atmospheric CO2.
Results show that forests expand from mid-latitudes to high latitudes as
CO2 increases from 1x to 10x and 16x, mainly due to the
CO2-induced warming. This expansion of mid-to-high latitude forests are
largely supported by the distribution of mid-Cretaceous fossil woods and
coal deposits. Globally, the presence of vegetation increases mean annual
temperature and precipitation by 0.9 °C and 0.11 mm day−1
relative to bare ground. High-latitude warming induced by the presence of
vegetation (∼1.9 °C) is less than half of that reported
in previous studies. The weaker warming here is mainly due to less
pronounced albedo feedbacks, and to a less extent, reduced poleward heat
transport via weakening of the meridional overturning circulation. Our
results suggest that other mechanisms in addition to high atmospheric
CO2 and high-latitude vegetation are required to maintain the polar
warmth. |
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