A possible record of the Younger Dryas event in deep-sea sediments of the Southern Ocean (Pacific sector) (Articolo in rivista)

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  • A possible record of the Younger Dryas event in deep-sea sediments of the Southern Ocean (Pacific sector) (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Morigi, C., Capotondi, L., Giglio, F., Langone, L., Brilli, M., Turi, B., Ravaioli, M (2003)
    A possible record of the Younger Dryas event in deep-sea sediments of the Southern Ocean (Pacific sector)
    (literal)
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  • Morigi, C., Capotondi, L., Giglio, F., Langone, L., Brilli, M., Turi, B., Ravaioli, M (literal)
Pagina inizio
  • 265 (literal)
Pagina fine
  • 278 (literal)
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  • Impact factor: 1.766 (literal)
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  • 198 (literal)
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  • Impact Factor nel 2002 è 1.497. (literal)
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  • Microfaunal and oxygen isotopic investigations performed on two deep-sea cores collected between New Zealand and the Ross Sea yield information on the climatic history of the Paci¢c sector of the Southern Ocean, during the last 14 kyr. The marked N18O maximum in both isotopic curves implies that a signi¢cant cooling occurred during an overall warming trend.Calibrat ed ages indicate that the end of this cold event corresponds to the termination of the Younger Dryas event.The break in the synchronicity of climate change has already been thought to occur at the PF instead of at the equator (Broecker, 1996; Bard et al., 1997).The record of a short-term cold spell, synchronous with the Younger Dryas event in sediments collected south of the PF of the Pacific Southern Ocean, indicates that the decoupling of the two hemispheres occurs at higher latitude. Col lection and analysis of additional Antarctic deep sediment cores of the Paci¢c sector, especially from the PF area, is expected to con- firm our observations. (literal)
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  • ISI Web of Science (WOS) (literal)
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  • 1: Dipartimento di Scienze del Mare, Universita' Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy 2: ISMAR-Sezione di Geologia Marina, Via Gobetti 101, Bologna, Italy 3: Centro di Studio per il Quaternario e l’evoluzione ambientale ^ CNR, P.le Aldo Moro 5, Rome, Italy (literal)
Titolo
  • A possible record of the Younger Dryas event in deep-sea sediments of the Southern Ocean (Pacific sector) (literal)
Abstract
  • The oxygen isotope record combined with radiocarbon dating from two deep-sea cores collected along a transect between New Zealand and the Ross Sea are used to establish a reliable chronostratigraphy for the last 14 kyr. After an integrated geochemical and micropaleontological analysis in this timeframe we detected a cooling interval dated between 12.5 cal kyr BP and 11.4 cal kyr BP. The age control suggests that this event started 1.5 kyr after the onset of the Antarctic Cold Reversal previously observed in several Antarctic ice cores. We infer that the observed cool event corresponds to the Younger Dryas event defined in Northern Europe. This suggests that climate change recorded in this sector of the Southern Hemisphere still shows some synchronicity with Northern Hemisphere variations and that the decoupling of climate change between the two hemispheres likely occurred south of the Polar Front. (literal)
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