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Water-level variations in Lake Nhauhache, Mozambique, during the last 2,300 years.(Report)

Holmgren, Karin ; Risberg, Jan ; Freudendahl, Johan ; Achimo, Mussa ; Ekblom, Anneli ; Mugabe, Joao ; Norstrom, Elin ; Sitoe, Sandra

Journal of Paleolimnology, August, 2012, Vol.48(2), p.311(12) [Periódico revisado por pares]

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  • Título:
    Water-level variations in Lake Nhauhache, Mozambique, during the last 2,300 years.(Report)
  • Autor: Holmgren, Karin ; Risberg, Jan ; Freudendahl, Johan ; Achimo, Mussa ; Ekblom, Anneli ; Mugabe, Joao ; Norstrom, Elin ; Sitoe, Sandra
  • Assuntos: Limnology ; Archaeology ; Humidity
  • É parte de: Journal of Paleolimnology, August, 2012, Vol.48(2), p.311(12)
  • Descrição: Byline: Karin Holmgren (1,2), Jan Risberg (1,2), Johan Freudendahl (1,2), Mussa Achimo (3), Anneli Ekblom (4), Joao Mugabe (3), Elin Norstrom (1,2), Sandra Sitoe (3) Keywords: Southern Africa; Lake-level changes; Paleohydrology; Paleoclimatology; Microfossils Abstract: Stratigraphic variations in diatom composition and phytolith abundance in a sediment core from a small, hydrologically isolated waterbody, Lake Nhauhache, Mozambique, provide evidence of water-level fluctuations over the past ~2,300 years. Ten AMS radiocarbon dates on bulk sediment samples show that the lake came into existence about 2,300 years ago and that it has dried out since then, but only for brief time periods. Changes in the diatom assemblage composition indicate that lake level fluctuated in response to shifting humidity conditions. The changes reflect wetter conditions ca. 300 BC--AD 800, more variable conditions between AD 800 and 1150, a distinct dry phase within the time span AD 1150--1700 and a return thereafter to more humid conditions until present. There is general agreement between the Lake Nhauhache record and other records from the Southern Hemisphere summer rainfall region. This suggests that sediments from small interdunal lakes, which are abundant along the coast of southern Africa, provide reliable, regional paleoenvironmental information about an area from which more such data are needed. Author Affiliation: (1) Bert Bolin Centre of Climate Research, Stockholm University, 10691, Stockholm, Sweden (2) Department of Physical Geography and Quaternary Geology, Stockholm University, 10691, Stockholm, Sweden (3) Department of Geology, University of Eduardo Mondlane, Maputo, Mozambique (4) Department of Archaeology and Ancient History, African and Comparative Archaeology, Uppsala University, Box 626, 751 26, Uppsala, Sweden Article History: Registration Date: 29/02/2012 Received Date: 28/07/2011 Accepted Date: 29/02/2012 Online Date: 21/03/2012
  • Idioma: English

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