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Titolo:
A dramatic Atlantic dissolution event at the onset of the last glaciation
Autore:
Broecker, W; Clark, E;
Indirizzi:
Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA Columbia Univ Palisades NY USA 10964 arth Observ, Palisades, NY 10964 USA
Titolo Testata:
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
, volume: 2, anno: 2001,
pagine: NIL_1 - NIL_15
SICI:
1525-2027(20011102)2:<NIL_1:ADADEA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEEP-SEA; ATMOSPHERIC CO2; PRESERVATION; CALCITE; OCEAN; PH; FORAMINIFERA; SEDIMENTS; HOLOCENE; RISE;
Keywords:
CaCO3 dissolution; CaCO3 cycle; sedimentary geochemistry; geochemical cycles; marine geochemistry; inorganic marine chemistry; organic marine chemistry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Broecker, W Columbia Univ, Lamont Doherty Earth Observ, Route 9W, Palisades, NY 10964 USA Columbia Univ Route 9W Palisades NY USA 10964 es, NY 10964 USA
Citazione:
W. Broecker e E. Clark, "A dramatic Atlantic dissolution event at the onset of the last glaciation", GEOCH GEO G, 2, 2001, pp. NIL_1-NIL_15

Abstract

Measurements of the CaCO3 content of the CaCO3 size index and of foraminifera weights demonstrate that a prominent dissolution event occurred in the western equatorial Atlantic at the onset of the last glacial period. The decrease in CO3= ion concentration appears to have been too large to be accounted for by the ocean acidification associated with the demise of excess interglacial biomass. Rather, it appears to have been the result of a temporary strengthening of the penetration of the glacial equivalent Antarctic Bottom Water into the Atlantic. The co-occurrence of massive Ethmodiscus re deposition in the eastern equatorial Atlantic bears witness to a reorganization of circulation in the Atlantic. This reorganization may well reflect a temporary collapse of conveyor circulation at the onset of the last glaciation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 12:55:23