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| Titel |
Tropical climate and vegetation changes during Heinrich Event 1: a model-data comparison |
| VerfasserIn |
D. Handiani, A. Paul, L. Dupont |
| 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. 1 ; Nr. 8, no. 1 (2012-01-04), S.37-57 |
| Datensatznummer |
250005360
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| Publikation (Nr.) |
 copernicus.org/cp-8-37-2012.pdf |
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| Zusammenfassung |
Abrupt climate changes from 18 to 15 thousand years before present (kyr BP)
associated with Heinrich Event 1 (HE1) had a strong impact on vegetation
patterns not only at high latitudes of the Northern Hemisphere, but also in
the tropical regions around the Atlantic Ocean. To gain a better
understanding of the linkage between high and low latitudes, we used the
University of Victoria (UVic) Earth System-Climate Model (ESCM) with
dynamical vegetation and land surface components to simulate four scenarios
of climate-vegetation interaction: the pre-industrial era, the Last Glacial
Maximum (LGM), and a Heinrich-like event with two different climate
backgrounds (interglacial and glacial). We calculated mega-biomes from the
plant-functional types (PFTs) generated by the model to allow for a direct
comparison between model results and palynological vegetation
reconstructions.
Our calculated mega-biomes for the pre-industrial period and the LGM
corresponded well with biome reconstructions of the modern and LGM time
slices, respectively, except that our pre-industrial simulation predicted
the dominance of grassland in southern Europe and our LGM simulation
resulted in more forest cover in tropical and sub-tropical South America.
The HE1-like simulation with a glacial climate background produced
sea-surface temperature patterns and enhanced inter-hemispheric thermal
gradients in accordance with the "bipolar seesaw" hypothesis. We found
that the cooling of the Northern Hemisphere caused a southward shift of
those PFTs that are indicative of an increased desertification and a retreat
of broadleaf forests in West Africa and northern South America. The
mega-biomes from our HE1 simulation agreed well with paleovegetation data
from tropical Africa and northern South America. Thus, according to our
model-data comparison, the reconstructed vegetation changes for the tropical
regions around the Atlantic Ocean were physically consistent with the remote
effects of a Heinrich event under a glacial climate background. |
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