Masked millennial-scale climate variations in south West Africa during the last glaciation

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doi: 10.5194/cp-8-841-2012
Author(s): Hessler, Ines; Dupont, Lydie M.; Handiani, Dian; Paul, André; Merkel, Ute; Wefer, H. C. G.
Author Affiliation(s): Primary:
University of Bremen, Center for Marine Environmental Sciences, Bremen, Germany
Volume Title: Climate of the Past
Source: Climate of the Past, 8(2), p.841-853. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. Includes supplement: http://www.clim-past.net/8/841/2012/cp-8-841-2012-supplement.pdf; published in Climate of the Past Discussion: 20 October 2011, http://www.clim-past-discuss.net/7/3511/2011/cpd-7-3511-2011.html; accessed in June, 2012. 81 refs.; illus., incl. sketch maps
Summary: To address the connection between tropical African vegetation development and high-latitude climate change we present a high-resolution pollen record from ODP Site 1078 (off Angola) covering the period 50-10 ka BP. Although several tropical African vegetation and climate reconstructions indicate an impact of Heinrich Stadials (HSs) in Southern Hemisphere Africa, our vegetation record shows no response. Model simulations conducted with an Earth System Model of Intermediate Complexity including a dynamical vegetation component provide one possible explanation. Because both precipitation and evaporation increased during HSs and their effects nearly cancelled each other, there was a negligible change in moisture supply. Consequently, the resulting climatic response to HSs might have been too weak to noticeably affect the vegetation composition in the study area. Our results also show that the response to HSs in southern tropical Africa neither equals nor mirrors the response to abrupt climate change in northern Africa.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Africa; Angola; Angola Basin; Atlantic Ocean; Atmospheric precipitation; Biostratigraphy; C-14; Carbon; Carbon dioxide; Cenozoic; Central Africa; Climate change; Congo; Congo Democratic Republic; Evaporation; Foraminifera; Gabon; Globigerinacea; Globigerinidae; Globigerinoides; Globigerinoides ruber; Heinrich events; Holocene; Intertropical convergence zone; Invertebrata; Isotopes; Last glacial maximum; Leg 175; Microfossils; Miospores; Namibia; ODP Site 1078; Ocean Drilling Program; Paleoclimatology; Paleoenvironment; Palynomorphs; Pollen; Protista; Quaternary; Radioactive isotopes; Rotaliina; South Atlantic; Southern Africa; Tropical environment; Vegetation
Coordinates: S230000 S000000 E0300000 E0080000
Record ID: 2012069101
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany