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PANGAEA - Publishing Network for Geoscientific & Environmental Data (840.036 recursos)

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Datasets with PANGAEA technical keyword @ORFOISatBIGSET2

Mostrando recursos 41 - 60 de 9.067

  1. Age determination of North Atlantic sediment cores

    Bard, Édouard; Fairbanks, Richard G; Maurice, Pierre; Duprat, Josette M; Moyes, Jean; Duplessy, Jean-Claude
    Coupled measurements of delta18O and accelerator mass spectrometry (AMS) 14C in a particular species of planktonic foraminifera may be used to calculate sea-level estimates for the last deglaciation. Of critical importance for this type of study is a knowledge of the seasonality of foraminiferal growth, which can be provided by delta18O measurements of modern shells (core tops, plankton tows). Isotopic (delta18O, AMS-14C dating) and faunal records (transfer function sea surface temperature) were obtained from two cores in the North Atlantic at about 37°N. The locations were chosen to obtain high sedimentation rate records removed from the major ice-melt discharge areas...

  2. Size distribution of Holocene planktic foraminifer assemblages

    Schmidt, Daniela N; Renaud, Sabrina; Bollmann, Jörg; Schiebel, Ralf; Thierstein, Hans R
    The size of any organism is influenced by the surrounding ecological conditions. In this study, we investigate the effects of such factors on the size spectra of planktic foraminiferal assemblages from Holocene surface sediments. We analyzed assemblages from 69 Holocene samples, which cover the major physical and chemical gradients of the oceans. On a global scale, the range of sizes in assemblages triples from the poles to the tropics. This general temperature-related size increase is interrupted by smaller sizes at temperatures characteristic of the polar and subtropical fronts, at 2°C and 17°C, respectively, as well as in upwelling areas. On...

  3. Size distribution of Holocene planktic foraminifer assemblages

    Schmidt, Daniela N; Renaud, Sabrina; Bollmann, Jörg; Schiebel, Ralf; Thierstein, Hans R
    The size of any organism is influenced by the surrounding ecological conditions. In this study, we investigate the effects of such factors on the size spectra of planktic foraminiferal assemblages from Holocene surface sediments. We analyzed assemblages from 69 Holocene samples, which cover the major physical and chemical gradients of the oceans. On a global scale, the range of sizes in assemblages triples from the poles to the tropics. This general temperature-related size increase is interrupted by smaller sizes at temperatures characteristic of the polar and subtropical fronts, at 2°C and 17°C, respectively, as well as in upwelling areas. On...

  4. Vertical distribution of benthic foraminifers in the Arctic Ocean

    Wollenburg, Jutta E; Mackensen, Andreas
    The vertical distribution of living (Rose Bengal stained) benthic foraminifers was determined in the upper 15 cm of sediment cores taken along transects extending from the continental shelf of Spitsbergen through the Eurasian Basin of the Arctic Ocean. Cores taken by a multiple corer were raised from 50 stations with water depths between 94 and 4427 m, from areas with moderate primary production values to areas that are among the least productive ones in the world. We believe, that in the Arctic Ocean the vertical distribution of living foraminifers is determined by the restricted availability of food. Live foraminiferal faunas...

  5. Vertical distribution of benthic foraminifers in the Arctic Ocean

    Wollenburg, Jutta E; Mackensen, Andreas
    The vertical distribution of living (Rose Bengal stained) benthic foraminifers was determined in the upper 15 cm of sediment cores taken along transects extending from the continental shelf of Spitsbergen through the Eurasian Basin of the Arctic Ocean. Cores taken by a multiple corer were raised from 50 stations with water depths between 94 and 4427 m, from areas with moderate primary production values to areas that are among the least productive ones in the world. We believe, that in the Arctic Ocean the vertical distribution of living foraminifers is determined by the restricted availability of food. Live foraminiferal faunas...

  6. Glacial North Atlantic: Sea surface conditions reconstructed by GLAMAP 2000

    Pflaumann, Uwe; Sarnthein, Michael; Chapman, Mark R; de Abreu, Lucia; Funnell, Brian M; Hüls, Matthias; Kiefer, Thorsten; Maslin, Mark A; Schulz, Hartmut; Swallow, John; van Kreveld, Shirley A; Vautravers, Maryline J; Vogelsang, Elke; Weinelt, Mara
    The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP...

  7. Glacial North Atlantic: Sea surface conditions reconstructed by GLAMAP 2000

    Pflaumann, Uwe; Sarnthein, Michael; Chapman, Mark R; de Abreu, Lucia; Funnell, Brian M; Hüls, Matthias; Kiefer, Thorsten; Maslin, Mark A; Schulz, Hartmut; Swallow, John; van Kreveld, Shirley A; Vautravers, Maryline J; Vogelsang, Elke; Weinelt, Mara
    The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP...

  8. Glacial North Atlantic: Sea surface conditions reconstructed by GLAMAP 2000

    Pflaumann, Uwe; Sarnthein, Michael; Chapman, Mark R; de Abreu, Lucia; Funnell, Brian M; Hüls, Matthias; Kiefer, Thorsten; Maslin, Mark A; Schulz, Hartmut; Swallow, John; van Kreveld, Shirley A; Vautravers, Maryline J; Vogelsang, Elke; Weinelt, Mara
    The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP...

  9. Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

    Mix, Alan C; Morey, Ann E; Pisias, Nicklas G; Hostetler, Steven W
    The sensitivity of the tropics to climate change, particularly the amplitude of glacial-to-interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no-analog planktonic foraminiferal assemblages in the equatorial oceans that confounds both classical transfer function and modern analog methods. A new calibration strategy developed here, which uses past variability of species to define robust faunal assemblages, solves the no-analog problem and reveals ice age cooling of 5° to 6°C in the equatorial current systems of the Atlantic and eastern Pacific...

  10. Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

    Mix, Alan C; Morey, Ann E; Pisias, Nicklas G; Hostetler, Steven W
    The sensitivity of the tropics to climate change, particularly the amplitude of glacial-to-interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no-analog planktonic foraminiferal assemblages in the equatorial oceans that confounds both classical transfer function and modern analog methods. A new calibration strategy developed here, which uses past variability of species to define robust faunal assemblages, solves the no-analog problem and reveals ice age cooling of 5° to 6°C in the equatorial current systems of the Atlantic and eastern Pacific...

  11. Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

    Mix, Alan C; Morey, Ann E; Pisias, Nicklas G; Hostetler, Steven W
    The sensitivity of the tropics to climate change, particularly the amplitude of glacial-to-interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no-analog planktonic foraminiferal assemblages in the equatorial oceans that confounds both classical transfer function and modern analog methods. A new calibration strategy developed here, which uses past variability of species to define robust faunal assemblages, solves the no-analog problem and reveals ice age cooling of 5° to 6°C in the equatorial current systems of the Atlantic and eastern Pacific...

  12. Hydrochemistry measured on water bottle samples during the METEOR International Indian Ocean Expedition 1964/65

    Dietrich, Günter; Düing, Walter; Grasshoff, Klaus; Koske, Peter H
    The present volume gives the observed physical and chemical data obtained by R.V. "Meteor" in the Indian Ocean during cruise 1964/65. The tables are based on the computations made by the National Oceanographic Data Center (NODC) in Washington. In addition to the normally communicated data, the tables contain four chemical parameters: alkalinity, ammonia, fluoride, and calcium.

  13. Hydrochemistry measured on water bottle samples during the METEOR International Indian Ocean Expedition 1964/65

    Dietrich, Günter; Düing, Walter; Grasshoff, Klaus; Koske, Peter H
    The present volume gives the observed physical and chemical data obtained by R.V. "Meteor" in the Indian Ocean during cruise 1964/65. The tables are based on the computations made by the National Oceanographic Data Center (NODC) in Washington. In addition to the normally communicated data, the tables contain four chemical parameters: alkalinity, ammonia, fluoride, and calcium.

  14. Sediment facies of the Indian-Pakistan continental margin, Indian Ocean Expedition

    von Stackelberg, Ulrich
    The studies described here base mainly on sedimentary material collected during the "Indian Ocean Expedition" of the German research vessel "Meteor" in the region of the Indian-Pakistan continental margin in February and March 1965. Moreover,samples from the mouth of the Indus-River were available, which were collected by the Pakistan fishing vessel "Machhera" in March 1965. Altogether, the following quantities of sedimentary material were collected: 59.73 m piston cores. 54.52 m gravity cores. 33 box grab samples. 68 bottom grab samples Component analyses of the coarse fraction were made of these samples and the sedimentary fabric was examined. Moreover, the CaCO3 and...

  15. Sediment facies of the Indian-Pakistan continental margin, Indian Ocean Expedition

    von Stackelberg, Ulrich
    The studies described here base mainly on sedimentary material collected during the "Indian Ocean Expedition" of the German research vessel "Meteor" in the region of the Indian-Pakistan continental margin in February and March 1965. Moreover,samples from the mouth of the Indus-River were available, which were collected by the Pakistan fishing vessel "Machhera" in March 1965. Altogether, the following quantities of sedimentary material were collected: 59.73 m piston cores. 54.52 m gravity cores. 33 box grab samples. 68 bottom grab samples Component analyses of the coarse fraction were made of these samples and the sedimentary fabric was examined. Moreover, the CaCO3 and...

  16. Age model of DSDP Hole 90-588

    Woodruff, Fay; Savin, Samuel M

  17. Age model of DSDP Hole 90-588

    Woodruff, Fay; Savin, Samuel M

  18. Age model of DSDP Hole 85-574

    Woodruff, Fay; Savin, Samuel M

  19. Age model of DSDP Hole 85-574

    Woodruff, Fay; Savin, Samuel M

  20. Age model of DSDP Hole 82-563

    Woodruff, Fay; Savin, Samuel M

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