Journal ArticleDOI
Alkenones in Gephyrocapsa oceanica: Implications for studies of paleoclimate
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TLDR
In this paper, the authors showed that Gephyrocapsa oceanica can synthesize C 37 C 39 alkenones and esters of di- and tri-unsaturated C 36 fatty acids.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1995-02-01. It has received 408 citations till now. The article focuses on the topics: Alkenone & Emiliania huxleyi.read more
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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.
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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
Interhemispheric synchrony of the last deglaciation inferred from alkenone palaeothermometry
TL;DR: The authors applied the alkenone method of sea surface temperature reconstruction to several high-resolution sediment cores recovered from the tropical Indian Ocean between 20° N and 20° S. This finding, along with the results of recent modelling studies, provides strong support for the idea that changes in the ocean's global thermohaline circulation were not the only cause of interhemispheric climate teleconnection during the last deglaciation.
Journal ArticleDOI
Consistent fractionation of 13C in nature and in the laboratory: growth-rate effects in some haptophyte algae.
Robert R. Bidigare,Arnim Fluegge,Arnim Fluegge,Katherine H. Freeman,Kristi L. Hanson,John M. Hayes,John M. Hayes,David J. Hollander,David J. Hollander,John P. Jasper,Linda L. King,Edward A. Laws,Jeffrey C. Milder,Frank J. Millero,Richard D. Pancost,Brian N. Popp,Paul A. Steinberg,Stuart G. Wakeham +17 more
TL;DR: Before concentrations of dissolved CO2 can be estimated from isotopic fractionations, some means of accounting for variations in growth rate must be found, perhaps by drawing on relationships between [PO4] and Cd/Ca ratios in shells of planktonic foraminifera.
Journal ArticleDOI
A 40-million-year history of atmospheric CO2
TL;DR: A pCO2 record spanning the past 40 million years from a single marine locality, Ocean Drilling Program Site 925 located in the western equatorial Atlantic Ocean, shows that in the Neogene with low CO2 levels, algal carbon concentrating mechanisms and spontaneous biocarbonate–CO2 conversions are likely to play a more important role inAlgal carbon fixation, which provides a potential bias to the alkenone–pCO2 method.
References
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Journal ArticleDOI
A review of sterol markers for marine and terrigenous organic matter
TL;DR: It is indicated that inferences drawn from sterol distributions regarding sources of organic matter must be made with caution and should be supported using other lipid data, and that in ancient sediments and crude oils a high proportion of C 29 steranes need not indicate that most of the organic matter was derived from vascular plants.
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Molecular stratigraphy: a new tool for climatic assessment
TL;DR: 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.
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Calibration of unsaturation patterns in long-chain ketone compositions for palaeotemperature assessment
TL;DR: In this paper, a series of long-chain (C37, C38, C39) methyl and ethyl ketones, first identified in sediments from Walvis Ridge off West Africa and from the Black Sea, has been found in marine sediments throughout the world.
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Further evaluation of long-chain alkenones as indicators of paleoceanographic conditions
TL;DR: In this paper, the long-chain lipids of the marine coccolithophorid, Emiliania huxleyi, were grown in the laboratory at five temperatures (8°, 10°, 15°, 20°, 25°C) and monitored by capillary gas chromatography for their long chain, unsaturated lipid compositions.