Recursos de colección

PANGAEA - Publishing Network for Geoscientific & Environmental Data (831.507 recursos)

The information system PANGAEA is operated as an Open Access library aimed at archiving, publishing and distributing georeferenced data from earth system research. The system guarantees long-term availability of its content through a commitment of the operating institutions.

Datasets of project "Multiproxy Approach for the Reconstruction of the Glacial Ocean surface"

Mostrando recursos 1 - 20 de 43

  1. Model results of ocean physical field of the reference state and the targets in NetCDF format

    Takasumi, Kurahashi-Nakamura; Losch, Martin; Paul, André
    In a feasibility study, the potential of proxy data for the temperature and salinity during the Last Glacial Maximum (LGM, about 19 000 to 23 000 years before present) in constraining the strength of the Atlantic meridional overturning circulation (AMOC) with a general ocean circulation model was explored. The proxy data were simulated by drawing data from four different model simulations at the ocean sediment core locations of the Multiproxy Approach for the Reconstruction of the Glacial Ocean surface (MARGO) project, and perturbing these data with realistic noise estimates. The results suggest that our method has the potential to provide...

  2. Magnesium/Calcium ratios measured on planktonic foraminifera of the LGM

    Barker, Stephen; Cacho, Isabel; Benway, Heather M; Tachikawa, Kazuyo
    As part of the Multi-proxy Approach for the Reconstruction of the Glacial Ocean (MARGO) incentive, published and unpublished temperature reconstructions for the Last Glacial Maximum (LGM) based on planktonic foraminiferal Mg/Ca ratios have been synthesised and made available in an online database. Development and applications of Mg/Ca thermometry are described in order to illustrate the current state of the method. Various attempts to calibrate foraminiferal Mg/Ca ratios with temperature, including culture, trap and core-top approaches have given very consistent results although differences in methodological techniques can produce offsets between laboratories which need to be assessed and accounted for where possible....

  3. Various paleoclimate proxy parameters compiled within the MARGO project

    Barrows, Timothy T; Chen, Min-Te; de Vernal, Anne; Eynaud, Frédérique; Hillaire-Marcel, Claude; Kiefer, Thorsten; Lee, Kyung Eun; Marret, Fabienne; Henry, Maryse; Juggins, Steve; Londeix, Laurent; Mangin, Sylvie; Matthiessen, Jens; Radi, Taoufik; Rochon, André; Solignac, Sandrine; Turon, Jean-Louis; Waelbroeck, Claire; Weinelt, Mara

  4. Glacial Mediterranean sea surface tempertures based on planktonic foraminiferal assemblages

    Hayes, Angela; Kucera, Michal; Kallel, Nejib; Sbaffi, Laura; Rohling, Eelco J
    We present a new reconstruction of Mediterranean sea surface temperatures (SST) during the last glacial maximum (LGM). A calibration data set based on census counts of 23 species of planktonic foraminifera in 129 North Atlantic and 145 Mediterranean core top samples was used to develop summer, winter and annual average SST reconstructions using artificial neural networks (ANNs) and the revised analogue method (RAM). Prediction errors determined by cross-validation of the calibration data set ranged between 0.5 and 1.1 °C, with both techniques being most successful in predicting winter SSTs. Glacial reconstructions are based on a new, expanded data set of...

  5. Reconstruction of sea-surface temperatures from asseblages of planktonic foraminifera

    Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Steve; Waelbroeck, Claire
    We present a conceptual framework for a new approach to environmental calibration of planktonic foraminifer census counts. This approach is based on simultaneous application of a variety of transfer function techniques, which are trained on geographically constrained calibration data sets. It serves to minimise bias associated with the presence of cryptic species of planktonic foraminifera and provides an objective tool for assessing reliability of environmental estimates in fossil samples, allowing identification of adverse effects of no-analog faunas and technique-specific bias. We have compiled new calibration data sets for the North (N=862) and South (N=321) Atlantic and the Pacific Ocean (N=1111)....

  6. Reconstruction of sea-surface conditions at middle to high latitudes of the Northern Hemisphere

    de Vernal, Anne; Eynaud, Frédérique; Henry, Maryse; Hillaire-Marcel, Claude; Londeix, Laurent; Mangin, Sylvie; Matthiessen, Jens; Marret, Fabienne; Radi, Taoufik; Rochon, André; Solignac, Sandrine; Turon, Jean-Louis
    A new calibration database of census counts of organic-walled dinoflagellate cyst (dinocyst) assemblages has been developed from the analyses of surface sediment samples collected at middle to high latitudes of the Northern Hemisphere after standardisation of taxonomy and laboratory procedures. The database comprises 940 reference data points from the North Atlantic, Arctic and North Pacific oceans and their adjacent seas, including the Mediterranean Sea, as well as epicontinental environments such as the Estuary and Gulf of St. Lawrence, the Bering Sea and the Hudson Bay. The relative abundance of taxa was analysed to describe the distribution of assemblages. The best...

  7. A global compolation of late Holocene planktonic foraminiferal d18O

    Waelbroeck, Claire; Mulitza, Stefan; Spero, Howard J; Dokken, Trond; Kiefer, Thorsten; Cortijo, Elsa
    We review the different sources of uncertainty affecting the oxygen isotopic composition of planktonic foraminifera and present a global planktonic foraminifera oxygen isotope data set that has been assembled within the MARGO project for the Late Holocene time slice. The data set consists of over 2100 data from recent sediment with thorough age control, that have been checked for internal consistency. We further examine how the oxygen isotopic composition of fossil foraminifera is related to hydrological conditions, based on published results on living foraminifera from plankton tows and cultures. Oxygen isotopic values (delta18O) of MARGO recent fossil foraminifera are 0.2-0.8...

  8. Constraints on the magnitude and patterns of ocean cooling at the Last Glacial Maximum - Supplementary material

    MARGO Project Members
    Observation-based reconstructions of sea surface temperature from relatively stable periods in the past, such as the Last Glacial Maximum, represent an important means of constraining climate sensitivity and evaluating model simulations. The first quantitative global reconstruction of sea surface temperatures during the Last Glacial Maximum was developed by the Climate Long-Range Investigation, Mapping and Prediction (CLIMAP) project in the 1970s and 1980s. Since that time, several shortcomings of that earlier effort have become apparent. Here we present an updated synthesis of sea surface temperatures during the Last Glacial Maximum, rigorously defined as the period between 23 and 19 thousand years...

  9. Sea-surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum

    Gersonde, Rainer; Crosta, Xavier; Abelmann, Andrea; Armand, Leanne K
    Based on the quantitative study of diatoms and radiolarians, summer sea-surface temperature (SSST) and sea ice distribution were estimated from 122 sediment core localities in the Atlantic, Indian and Pacific sectors of the Southern Ocean to reconstruct the last glacial environment at the EPILOG (19.5-16.0 ka or 23 000-19 000 cal yr. B.P.) time-slice. The statistical methods applied include the Imbrie and Kipp Method, the Modern Analog Technique and the General Additive Model. Summer SSTs reveal greater surface-water cooling than reconstructed by CLIMAP (Geol. Soc. Am. Map Chart. Ser. MC-36 (1981) 1), reaching a maximum (4-5 °C) in the present...

  10. Compilation of global planktic foraminifera LGM SST data

    Weinelt, Mara

  11. Compilation of regional dinoflagellate cyst LGM SST data

    de Vernal, Anne; Eynaud, Frédérique; Henry, Maryse; Hillaire-Marcel, Claude; Londeix, Laurent; Mangin, Sylvie; Matthiessen, Jens; Marret, Fabienne; Radi, Taoufik; Rochon, André; Solignac, Sandrine; Turon, Jean-Louis

  12. Compilation of diatom holocene SST data from the Southern Ocean

    Gersonde, Rainer; Crosta, Xavier; Abelmann, Andrea; Armand, Leanne K

  13. Compilation of diatom LGM SST data from the Southern Ocean

    Gersonde, Rainer; Crosta, Xavier; Abelmann, Andrea; Armand, Leanne K

  14. Compilation of Mg/Ca ratios of Neogloboquadrina pachyderma (sinistral) and SST estimates from the northern North Atlantic

    Meland, Marius Y; Jansen, Eystein; Elderfield, Henry
    A map of estimated calcification temperatures of the planktic foraminifer Neogloboquadrina pachyderma sinistral (TNps) for the Nordic Seas and the northern North Atlantic for the Last Glacial Maximum was produced from oxygen isotopes with support of Mg/Ca ratios. To arrive at the reconstruction, several constraints concerning the plausible salinity and ?18O-fields were employed. The reconstruction indicates inflow of temperate waters in a wedge along the eastern border of the Nordic Seas and at least seasonally ice-free waters. The reconstruction from oxygen isotopes shows similarities with Mg/Ca based paleotemperatures in the southern and southeastern sector, while unrealistically high Mg/Ca values in...

  15. Compilation of planktic Foraminifera census data, LGM from the Atlantic Ocean

    Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Steve; Waelbroeck, Claire

  16. Compilation of planktic Foraminifera census data, LGM from the Pacific Ocean

    Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Steve; Waelbroeck, Claire

  17. Compilation of Pacific Late Holocene planktic Foraminifera SST

    Kiefer, Thorsten; Chen, Min-Te

  18. Compilation of planktic Foraminifera census data, LGM and SSTs from the Pacific Ocean

    Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Steve; Waelbroeck, Claire

  19. Compilation of LGM planktic Foraminifera SSTs from the Atlantic Ocean

    Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Steve; Waelbroeck, Claire

  20. Compilation of planktic foraminifera census data, modern from the Pacific Ocean

    Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Steve; Waelbroeck, Claire

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.