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Prahl, Frederick G; Wakeham, Stuart G (1987): Alkenone UK37 measured in the upper water column at pump stations CariacoTrench, Peru and Vertex. PANGAEA,, Supplement to: Prahl, FG; Wakeham, SG (1987): Calibration of unsaturation patterns in long-chain ketone compositions for paleotemperature assessment. Nature, 330(6146), 367-369,

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A series of long-chain (C37, C38, C39), primarily di and tri-unsaturated methyl and ethyl ketones, first identified in sediments from Walvis Ridge off West Africa and from Black Sea (de Leeuw et al., 1979), has been found in marine sediments throughout the world (Brassell et al., 1986 doi:10.1038/320129a0). The marine coccolithophorid Emiliania huxleyi and members of the class Prymnesiophyceae are now the recognized sources of these compounds (Volkman et al., 1979; Marlowe, et al., 1984). Experiments with laboratory cultures of algae showed the degree of unsaturation in the ketone seris biosynthesized depends on growth temperature (Brassell et al., 1986; Marlowe, 1984), a physiological respons observed for classical membrane lipids (vanDeenen et al., 1972). Brassell and co-workers (Brassell et al., 198; Brassell et al., 1986b) thus proposed that systematic fluctuations in the unsaturation of these alkenones noted down-core in sediments from the Kane Gap region of the north-east tropical Atlantic Ocean and correlated with glacial-interglacial cycles provide an organic geochemical measure of past sea-surface water temperatures. Using laboratory cultures of E. huxleyi, we have calibrated changes in the unsaturation pattern of the long-chain ketone series versus growth temperature. The calibration curve is linear and accurtely predicts unsuturation patterns observed in natural particulate materials collected from oceanic waters of known temperature. We present evidence supporting the proposed paleotemperature hypothesis (Brassell et al., 1986, Brassel et al., 1986b) and suggesting absolute 'sea-surface temperatures' for a given oceanic location can be estimated from an analysis of long-chain ketone compositions preserved in glacial and interglacial horizons of deep-sea sediment cores.
Median Latitude: 21.141675 * Median Longitude: -108.687500 * South-bound Latitude: -15.166700 * West-bound Longitude: -138.616700 * North-bound Latitude: 36.100000 * East-bound Longitude: -65.300000
Minimum DEPTH, water: m * Maximum DEPTH, water: 250 m
CariacoTrench_PUMP1 * Latitude: 10.366700 * Longitude: -65.300000 * Method/Device: Water pump (PUMP)
Peru_PUMP1 * Latitude: -15.166700 * Longitude: -75.500000 * Method/Device: Water pump (PUMP)
VertexIII_PUMP1 * Latitude: 15.783300 * Longitude: -108.300000 * Method/Device: Water pump (PUMP)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Latitude of eventLatitude
2Longitude of eventLongitude
3Event labelEvent
4DEPTH, waterDepth watermGeocode
5Depth, top/minDepth topmPrahl, Frederick G
6Depth, bottom/maxDepth botmPrahl, Frederick G
7Alkenone, unsaturation index UK37UK37Prahl, Frederick GCalculated from C37 alkenones (Brassell et al., 1986)
17 data points

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