Oxygen Isotopes in Biogenic Silica: Global Changes in Ocean Temperature and Isotopic Composition

  title={Oxygen Isotopes in Biogenic Silica: Global Changes in Ocean Temperature and Isotopic Composition},
  author={Aldo Shemesh and Christopher D. Charles and Richard G. Fairbanks},
  pages={1434 - 1436}
A record of oxygen isotopes in biogenic silica from a deep-sea sediment core from the Southern Ocean reveals that marine diatoms retain their primary isotopic composition after burial. As a result, the marine diatom record can be combined with data on coexisting planktonic foraminifera to monitor past surface temperature and isotopic composition of seawater. The coupling of these two records allows the solution of two paleotemperature equations for each core interval. Data from a South Atlantic… Expand
Late Pleistocene oxygen isotope records of biogenic silica from the Atlantic sector of the Southern Ocean
We determined the isotopic composition of oxygen in marine diatoms in eight deep-sea cores recovered from the Atlantic sector of the Southern Ocean. The analytical reproducibility and core-to-coreExpand
Isotopic Evidence for Reduced Productivity in the Glacial Southern Ocean
Observations from deep-sea sediment cores from the Southern Ocean reveal that the primary production during the last glacial maximum was lower than Holocene productivity, which conflicts with the hypothesis that the low atmospheric carbon dioxide concentrations were introduced by an increase in the efficiency of the high-latitude biological pump. Expand
Climatically linked carbon isotope variation during the past 430,000 years in Southern Ocean sediments
We use the isotopic composition of carbon from organic matter enclosed within diatom frustules as a proxy for paleoproductivity and paleo-dissolved carbon dioxide concentrations in ocean surfaceExpand
Sensitivity of biogenic silica oxygen isotopes to changes in surface water temperature and palaeoclimatology
[1] Oxygen isotope ratios of biogenic silica derived from planktonic diatoms living in the pelagial of a freshwater lake are used to determine the temperature effect on the isotope fractionationExpand
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Pore fluids from the upper 60 meters of sediment 3000 meters below the surface of the tropical Atlantic indicate that the oxygen isotopic composition (δ18O) of seawater at this site during the lastExpand
Meltwater Input to the Southern Ocean During the Last Glacial Maximum
Three records of oxygen isotopes in biogenic silica from deep-sea sediment cores from the Atlantic and Indian sectors of the Southern Ocean reveal the presence of isotopically depleted diatomaceousExpand
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Isotopes in marine sediments
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Holocene climatic change in Swedish Lapland inferred from an oxygen-isotope record of lacustrine biogenic silica
Holocene climatic variability was studied in a 9500-year lake-sediment sequence from the Abisko region in Swedish Lapland, using the oxygen-isotope ratio in diatom biogenic silica (d18Osi).Expand
A 3000-year climatic record from biogenic silica oxygen isotopes in an equatorial high-altitude lake
A record of oxygen isotopes in biogenic opal from a high-altitude proglacial lake on Mount Kenya, East Africa, exhibits short-term fluctuations on a time scale of centuries as well as long-term variations. Expand


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Abstract The oxygen isotope composition of marine diatoms from hydraulic piston-cored samples of DSDP Site 480 vary widely, reflecting the great temperature variations and large isotopic changes ofExpand
The oxygen isotope stratigraphic record of the Late Pleistocene
Oxygen isotope measurements have been made in foraminifera from over 60 deep-sea sediment cores. Taken together with the oxygen isotope measurements published by Emiliani from Caribbean andExpand
Silica oxygen isotopes in diatoms: a 20,000 yr record in deep-sea sediments
PALAEOTEMPERATURE determinations based on oxygen isotope composition of planktonic foraminifera are well established for Quaternary and Tertiary deep-sea sediments1–4. Wide areas of the ocean floor,Expand
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From the time that detailed oxygen isotope records derived from foraminifera living in the constant-temperature environment of the abyssal ocean became available, there has been a discrepancy betweenExpand
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Circumpolar surface waters dominate the circulation of the Southern Ocean and sustain one of the ocean's largest standing stocks of biomass thereby producing a significant output of biogenicExpand
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Coral reefs drilled offshore of Barbados provide the first continuous and detailed record of sea level change during the last deglaciation. The sea level was 121 ± 5 metres below present level duringExpand
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Oxygen-18 records of benthic foraminifera from northeastern Atlantic and Southern Ocean cores are significantly different. This difference indicates that the deep water in the northeastern AtlanticExpand
Variations in mode of formation and temperature of oceanic deep waters over the past 125,000 years
Marked changes in the deep-water temperature of the different oceanic basins during the past 125 kyr are revealed by a detailed comparison of the oxygen isotopic composition ofbenthicforaminiferafromExpand
Oxygen isotope fractionation between biogenic silica and ocean water
Abstract The suitability of siliceous radiolaria skeletons in deep sea sediments for oxygen isotope investigations was determined. The δ notation used in this report is defined as: δ O 18 = [( O 18 OExpand
Oxygen isotopes, ice volume and sea level
Abstract A careful comparison is made between the most detailed records of sea level over the last glacial cycle, and two high-quality oxygen isotope records. One is a high-resolution benthonicExpand