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Titolo:
Late-Holocene climatic change recorded in sediment cores from Ellis Fjord,eastern Antarctica
Autore:
McMinn, A; Heijnis, H; Harle, K; McOrist, G;
Indirizzi:
Univ Tasmania, Inst Antarctic & So Ocean Studies, Hobart, Tas 7001, Australia Univ Tasmania Hobart Tas Australia 7001 dies, Hobart, Tas 7001, Australia Australian Nucl Sci & Technol Org, Environm Div, Menai, NSW 2234, Australia Australian Nucl Sci & Technol Org Menai NSW Australia 2234 234, Australia
Titolo Testata:
HOLOCENE
fascicolo: 3, volume: 11, anno: 2001,
pagine: 291 - 300
SICI:
0959-6836(200105)11:3<291:LCCRIS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEA-ICE EXTENT; VESTFOLD-HILLS; ORGANIC-MATTER; PHYTOPLANKTON SUCCESSION; GROWTH; ALGAE; VEGETATION; LIMITATION; DIATOMS;
Keywords:
Holocene; diatoms; marine sediment cores; sea ice; climatic change; Antarctica; Vestfold Hills;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: McMinn, A Univ Tasmania, Inst Antarctic & So Ocean Studies, GPO Box 252-77, Hobart, Tas 7001, Australia Univ Tasmania GPO Box 252-77 Hobart Tas Australia 7001 Australia
Citazione:
A. McMinn et al., "Late-Holocene climatic change recorded in sediment cores from Ellis Fjord,eastern Antarctica", HOLOCENE, 11(3), 2001, pp. 291-300

Abstract

An analysis of diatom assemblages, Total Organic Carbon (TOC), carbon-nitrogen ratio, delta C-13, biogenic silica and carbonate in two marine sediment cores from Ellis Fjord, eastern Antarctica, reveals episodes of climatic change at 3600, 2500, 2000 and 1000 yr BP. Using the diatom data, principalcomponent analysis, the fast-ice index (FI), benthic index (BI) and snow index (SI) (which are derived from the diatom data), a period of reduced temporal sea-ice cover is identified prior to 2500 BP. There was a large increase in sea-ice extent between 2500 and 2000 BP followed by a smaller decline. Temporal sea-ice extent after 2000 BP was still significantly greater than prior to 2500 BP. Both cores were taken from anoxic basins within the fjord. It was found that the better preservation allowed the recognition of taxa such as Chaetoceros vegetative cells, which are not usually preserved. This enabled the distinction between ice-edge blooms, dominated by Fragilariopsis curta, and open-water blooms dominated by Chaetoceros. Even though Watts Basin receives a significant summer meltwater input each year, it has not been possible to recognize this signal in the sediment core.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 23:21:21