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| Titel |
Thirty thousand years of vegetation development and climate change in Angola (Ocean Drilling Program Site 1078) |
| VerfasserIn |
L. M. Dupont, H. Behling, J.-H. Kim |
| 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 ; 4, no. 2 ; Nr. 4, no. 2 (2008-06-10), S.107-124 |
| Datensatznummer |
250001625
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| Publikation (Nr.) |
 copernicus.org/cp-4-107-2008.pdf |
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| Zusammenfassung |
| ODP Site 1078 situated under the coast of Angola provides the first record of
the vegetation history for Angola. The upper 11 m of the core covers the past
30 thousand years, which has been analysed palynologically in decadal to
centennial resolution. Alkenone sea surface temperature estimates were
analysed in centennial resolution. We studied sea surface temperatures and
vegetation development during full glacial, deglacial, and interglacial
conditions. During the glacial the vegetation in Angola was very open
consisting of grass and heath lands, deserts and semi-deserts, which suggests
a cool and dry climate. A change to warmer and more humid conditions is
indicated by forest expansion starting in step with the earliest temperature
rise in Antarctica, 22 thousand years ago. We infer that around the period of
Heinrich Event 1, a northward excursion of the Angola Benguela Front and the
Congo Air Boundary resulted in cool sea surface temperatures but rain forest
remained present in the northern lowlands of Angola. Rain forest and dry
forest area increase 15 thousand years ago. During the Holocene, dry forests
and Miombo woodlands expanded. Also in Angola globally recognised climate
changes at 8 thousand and 4 thousand years ago had an impact on the
vegetation. During the past 2 thousand years, savannah vegetation became
dominant. |
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