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Impact of precession on the climate, vegetation and fire activity in southern Africa during MIS4 5
Woillez, M.n; Levavasseur, G.; Daniau, A. -l.; Kageyama, M.; Urrego, D. H.; Sanchez Goni, Maria Fernanda; Hanquiez, Vincent.
The relationships between climate, vegetation and fires are a major subject of investigation in the context of climate change. In southern Africa, fire is known to play a crucial role in the existence of grasslands and Mediterranean-type biomes. Microcharcoal-based reconstructions of past fire activity in that region have shown a tight correlation between grass-fueled fires and the precessional cycle, with maximum fire activity during maxima of the climatic precession index. These changes have been interpreted as the result of changes in fuel load in response to precipitation changes in eastern southern Africa. Here we use the general circulation model IPSL_CM5A (Institut Pierre Simon Laplace Climate Model version 5A) and the dynamic vegetation model...
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Ano: 2014 URL: https://archimer.ifremer.fr/doc/00274/38485/36952.pdf
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Increased aridity in southwestern Africa during the warmest periods of the last interglacial 5
Urrego, D. H.; Sanchez Goni, M. F.; Daniau, A. -l.; Lechevrel, S.; Hanquiez, V..
Terrestrial and marine climatic tracers from marine core MD96-2098 were used to reconstruct glacial-interglacial climate variability in southwestern Africa between 194 and 24 thousand years before present. The pollen record documented three pronounced expansions of Namakaroo and fine-leaved savanna during the last interglacial ( Marine Isotopic Stage 5 -MIS 5). These Nama-karoo and fine-leaved savanna expansions were linked to increased aridity during the three warmest substadials of MIS 5. Enhanced aridity potentially resulted from a combination of reduced Benguela Upwelling, expanded subtropical high-pressure cells, and reduced austral-summer precipitation due to a northward shift of the Intertropical Convergence Zone. Decreased austral-winter...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00352/46287/45954.pdf
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