Grain-size distributions of the terrigenous fraction of two deep-sea sediment cores GeoB3375-1 and MD96-2094

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Bibliographic Details
Main Authors:	Stuut, Jan-Berend W, Lamy, Frank
Format:	Dataset Open Access
Language:	en
Published:	PANGAEA 2004
Subjects:	CALYPSO; Calypso Corer; Center for Marine Environmental Sciences; CHIPAL; GeoB3375-1; Gravity corer (Kiel type); IMAGES II; Marion Dufresne (1995); MARUM; MD105; MD962094; MD96-2094; Outer Walvis Ridge; SL; SO102/2; Sonne; South-East Pacific
Online Access:	Acceder al recurso
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author	Stuut, Jan-Berend W Lamy, Frank
author_facet	Stuut, Jan-Berend W Lamy, Frank
collection	Datos científicos de ciencias marinas y ambientales
contents	In this study, we present grain-size distributions of the terrigenous fraction of two deep-sea sediment cores from the SE Atlantic (offshore Namibia) and from the SE Pacific (offshore northern Chile), which we 'unmix' into subpopulations and which are interpreted as coarse eolian dust, fine eolian dust, and fluvial mud. The downcore ratios of the proportions of eolian dust and fluvial mud subsequently represent paleocontinental aridity records of southwestern Africa and northern Chile for the last 120,000 yr. The two records show a relatively wet Last Glacial Maximum (LGM) compared to a relatively dry Holocene, but different orbital variability on longer time scales. Generally, the northern Chilean aridity record shows higher-frequency changes, which are closely related to precessional variation in solar insolation, compared to the southwestern African aridity record, which shows a remarkable resemblance to the global ice-volume record. We relate the changes in continental aridity in southwestern Africa and northern Chile to changes in the latitudinal position of the moisture-bearing Southern Westerlies, potentially driven by the sea-ice extent around Antarctica and overprinted by tropical forcing in the equatorial Pacific Ocean.
format	Dataset Open Access
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publishDate	2004
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spellingShingle	Grain-size distributions of the terrigenous fraction of two deep-sea sediment cores GeoB3375-1 and MD96-2094 Stuut, Jan-Berend W Lamy, Frank CALYPSO; Calypso Corer; Center for Marine Environmental Sciences; CHIPAL; GeoB3375-1; Gravity corer (Kiel type); IMAGES II; Marion Dufresne (1995); MARUM; MD105; MD962094; MD96-2094; Outer Walvis Ridge; SL; SO102/2; Sonne; South-East Pacific In this study, we present grain-size distributions of the terrigenous fraction of two deep-sea sediment cores from the SE Atlantic (offshore Namibia) and from the SE Pacific (offshore northern Chile), which we 'unmix' into subpopulations and which are interpreted as coarse eolian dust, fine eolian dust, and fluvial mud. The downcore ratios of the proportions of eolian dust and fluvial mud subsequently represent paleocontinental aridity records of southwestern Africa and northern Chile for the last 120,000 yr. The two records show a relatively wet Last Glacial Maximum (LGM) compared to a relatively dry Holocene, but different orbital variability on longer time scales. Generally, the northern Chilean aridity record shows higher-frequency changes, which are closely related to precessional variation in solar insolation, compared to the southwestern African aridity record, which shows a remarkable resemblance to the global ice-volume record. We relate the changes in continental aridity in southwestern Africa and northern Chile to changes in the latitudinal position of the moisture-bearing Southern Westerlies, potentially driven by the sea-ice extent around Antarctica and overprinted by tropical forcing in the equatorial Pacific Ocean.
title	Grain-size distributions of the terrigenous fraction of two deep-sea sediment cores GeoB3375-1 and MD96-2094
topic	CALYPSO; Calypso Corer; Center for Marine Environmental Sciences; CHIPAL; GeoB3375-1; Gravity corer (Kiel type); IMAGES II; Marion Dufresne (1995); MARUM; MD105; MD962094; MD96-2094; Outer Walvis Ridge; SL; SO102/2; Sonne; South-East Pacific
url	https://doi.org/10.1594/PANGAEA.737996

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