Journal ArticleDOI
Molecular stratigraphy: a new tool for climatic assessment
TLDR
In this paper, the relative abundance behavior of two organic compounds, C37 alkenones over the upper 8 metres of a sediment core from the eastern equatorial Atlantic is inferred from a molecular record, ascribed to contributions from prymnesiophyte algae, which correlates well with variations in the δ18 signal for the calcareous skeletons of certain planktonic foraminifera.Abstract:
Variations in sea-surface temperatures over the past 500,000 years are inferred from the relative abundance behaviour of two organic compounds, C37 alkenones over the upper 8 metres of a sediment core from the eastern equatorial Atlantic. This molecular record, ascribed to contributions from prymnesiophyte algae, correlates well with the variations in the δ18 signal for the calcareous skeletons of certain planktonic foraminifera, thus providing the first demonstration of a new stratigraphical technique, which may be especially valuable where methods based on carbonate δ18 fail.read more
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Organic geochemical proxies of paleoceanographic, paleolimnologic, and paleoclimatic processes
TL;DR: In this article, the organic matter content of sediments is inferred from bulk properties such as elemental compositions, carbon and nitrogen stable isotope ratios, Rock-Eval pyrolysis data, and organic petrography.
Journal ArticleDOI
Microalgal biomarkers: A review of recent research developments
John K. Volkman,Stephanie M. Barrett,Susan I. Blackburn,Maged P. Mansour,Elisabeth L. Sikes,François Gelin +5 more
TL;DR: A review of some recent advances in knowledge of the wide variety of lipid types that have been isolated from microalgae with an emphasis on those likely to be useful biomarkers for identifying sources of organic matter in sediments.
Journal ArticleDOI
Distributional variations in marine crenarchaeotal membrane lipids: a new tool for reconstructing ancient sea water temperatures?
TL;DR: In this article, a significant linear correlation was found between the number of cyclopentane rings in sedimentary membrane lipids derived from marine crenarchaota and the annual mean sea surface temperatures, suggesting that the mechanism of physical adaptation of their membrane compositions to temperature is identical to that of their thermophilic relatives.
Journal ArticleDOI
Calibration of the alkenone paleotemperature index U37K′ based on core-tops from the eastern South Atlantic and the global ocean (60°N-60°S)
TL;DR: In this article, a sediment-based calibration of the U37K′ paleotemperature index is presented, based on the analysis of 149 surface sediments from the eastern South Atlantic in order to define the most suitable calibration for this region.
Journal ArticleDOI
Sea-land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals
Miryam Bar-Matthews,Avner Ayalon,Mabs Gilmour,Alan Matthews,Chris J. Hawkesworth,Chris J. Hawkesworth +5 more
TL;DR: In this article, a new, accurately dated 250-kyr δ18O and δ13C record determined from speleothems of the Peqiin Cave, Northern Israel is presented.
References
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Journal ArticleDOI
Variations in the Earth's Orbit: Pacemaker of the Ice Ages
TL;DR: It is concluded that changes in the earth's orbital geometry are the fundamental cause of the succession of Quaternary ice ages and a model of future climate based on the observed orbital-climate relationships, but ignoring anthropogenic effects, predicts that the long-term trend over the next sevem thousand years is toward extensive Northern Hemisphere glaciation.
Journal ArticleDOI
Oxygen isotope and palaeomagnetic stratigraphy of Equatorial Pacific core V28-238: Oxygen isotope temperatures and ice volumes on a 105 year and 106 year scale☆
TL;DR: The core Vema 28-238 as discussed by the authors preserves an excellent oxygen isotope and magnetic stratigraphy and is shown to contain undisturbed sediments deposited continuously through the past 870,000 yr.
Journal ArticleDOI
Organic geochemical indicators of palaeoenvironmental conditions of sedimentation
TL;DR: In this article, the role of oxic and anoxic sedimentary environments is evaluated using a combination of geochemical parameters such as lipid composition, sulphur and organic pigments.
BookDOI
Milankovitch and Climate
TL;DR: Adem et al. as discussed by the authors simulate the equilibrium climate at five different stages of the last deglaciation, in order to assess the respective role of different forcings: insolation, ice boundaries and sea surface temperature.