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Author Schrag, D. P. ♦ Hampt, G. ♦ Murray, D. W.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ENVIRONMENTAL SCIENCES ♦ TROPICAL REGIONS ♦ PALEOCLIMATOLOGY ♦ INTERSTITIAL WATER ♦ ISOTOPE RATIO ♦ OXYGEN ♦ PLEISTOCENE EPOCH ♦ CLIMATIC CHANGE ♦ FORAMINIFERA
Abstract Pore fluids from the upper 60 meters of sediment 3000 meters below the surface of the tropical Atlantic indicate that the oxygen isotopic composition ({delta}{sup 18}O) of seawater at this site during the last glacial maximum was 0.8 {plus_minus} 0.1 per mil higher than it is today. Combined with the {delta}{sup 18}O change in benthic foraminifera from this region, the elevated ratio indicates that the temperature of deep water in the tropical Atlantic Ocean was 4{degree}C colder during the last glacial maximum. Extrapolation from this site to a global average suggests that the ice volume contribution to the change in {delta}{sup 18}O of foraminifera is 1.0 per mil, which partially reconciles the foraminiferal oxygen isotope record of tropical sea surface temperatures with estimates from Barbados corals and terrestrial climate proxies. 25 refs., 3 figs.
ISSN 00368075
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-28
Publisher Place United States
Journal Science
Volume Number 272
Issue Number 5270


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