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Glacial to Holocene Hydroclimate in Western Africa: Insights from Organic and Major-Element Geochemistry of Hemipelagic Atlantic Ocean Sediments
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Other Titles: | Das glaziale und holozäne Hydroklima West-Afrikas: Einblicke durch organische und Hauptelement-Geochemie an hemipelagischen Sedimenten des Atlantiks | Authors: | Collins, James A | Supervisor: | Wefer, Gerold ![]() |
1. Expert: | Wefer, Gerold ![]() |
2. Expert: | Schulz, Michael | Abstract: | The distribution of rainfall in Africa during past climates is not well constrained. In particular, many existing proxy reconstructions in Africa are not consistent with North-South migrations of the rainbelt that are seen in other regions. In this thesis, rainfall distribution across western Africa is investigated at key climate states of the past using a transect of hemipelagic marine sediment cores spanning from 21°N to 23°S in the eastern Atlantic Ocean. Stable carbon and hydrogen isotopes of plant leaf wax n-alkanes are interpreted as proxies for vegetation type and the hydrogen isotopic composition of meteoric water, respectively. In semi-arid regions, dust emissions are strongly linked to hydroclimate. As such, major element geochemistry from 4 continuous sediment core records (21°N-9°N) is also investigated in order to reconstruct dust vs river input from West Africa over the last 45kyrs. |
Keywords: | African Palaeoclimate Geochemistry Isotopes | Issue Date: | 5-Oct-2011 | Type: | Dissertation | URN: | urn:nbn:de:gbv:46-00102404-13 | Institution: | Universität Bremen | Faculty: | FB5 Geowissenschaften |
Appears in Collections: | Dissertationen |
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