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Millennial-scale changes in vegetation records from tropical Africa and South America during the last glacial
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2010 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 29, no 21-22, 2882-2899 p.Article in journal (Refereed) Published
Abstract [en]

To reconstruct the response of vegetation to abrupt climate changes during the last glacial we have compiled pollen records from the circum-Atlantic tropics between 23 degrees N and 23 degrees S from both marine and terrestrial sediment cores. Pollen data were grouped into mega-biomes to facilitate the comparison between the different records. Most tropical African records do not appear to register Dansgaard-Oeschger (D-O) variability, although there are vegetation changes during Heinrich Stadials (HS). There is a stronger signal of D-O and HS variability in the South American records. Records close to the modern northern and southern limits of the Intertropical Convergence Zone (ITCZ) show opposite trends in vegetation development during HS and D-O cycles. The pollen data from tropical South America corroborate the hypothesis of a southward shift in the migration pattern of the ITCZ and a reduction in the Atlantic Meridional Overturning Circulation (AMOC) during HS.

Place, publisher, year, edition, pages
2010. Vol. 29, no 21-22, 2882-2899 p.
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Natural Sciences
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URN: urn:nbn:se:su:diva-51691DOI: 10.1016/j.quascirev.2009.11.029ISI: 000282851600005OAI: oai:DiVA.org:su-51691DiVA: diva2:385740
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authorCount :13Available from: 2011-01-12 Created: 2011-01-12 Last updated: 2017-12-11Bibliographically approved

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Helmens, Karin F.
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