Recursos de colección

PANGAEA - Publishing Network for Geoscientific & Environmental Data (839.056 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 with PANGAEA technical keyword @imagesresults

Mostrando recursos 1 - 20 de 756

  1. Paleoceanographic analysis of sediments from the Norwegian Sea

    Dreger, Derek
    Two ultra-high resolution IMAGES sediment cores from the SW continental slope of the Barents Sea and the Vøring Plateau are used to reconstruct fluctuations of a Barents Sea ice sheet with respect to variations in flow intensity and direction of the Norwegian Current during the last glacial-to-interglacial cycle (> 40 - 6.6 14C kyr BP equal to 45 - 7.5 cal. kyr BP). Detailed planktic AMS 14C records from both locations reveal a strong tendency towards higher ages during periods of intense meltwater and/or glacial activity on the Barents shelf. Ages in the core from the continental slope are heavily influenced...

  2. Paleoceanographic analysis of sediments from the Norwegian Sea

    Dreger, Derek
    Two ultra-high resolution IMAGES sediment cores from the SW continental slope of the Barents Sea and the Vøring Plateau are used to reconstruct fluctuations of a Barents Sea ice sheet with respect to variations in flow intensity and direction of the Norwegian Current during the last glacial-to-interglacial cycle (> 40 - 6.6 14C kyr BP equal to 45 - 7.5 cal. kyr BP). Detailed planktic AMS 14C records from both locations reveal a strong tendency towards higher ages during periods of intense meltwater and/or glacial activity on the Barents shelf. Ages in the core from the continental slope are heavily influenced...

  3. Paleoceanographic analysis of sediments from the Norwegian Sea

    Dreger, Derek
    Two ultra-high resolution IMAGES sediment cores from the SW continental slope of the Barents Sea and the Vøring Plateau are used to reconstruct fluctuations of a Barents Sea ice sheet with respect to variations in flow intensity and direction of the Norwegian Current during the last glacial-to-interglacial cycle (> 40 - 6.6 14C kyr BP equal to 45 - 7.5 cal. kyr BP). Detailed planktic AMS 14C records from both locations reveal a strong tendency towards higher ages during periods of intense meltwater and/or glacial activity on the Barents shelf. Ages in the core from the continental slope are heavily influenced...

  4. Age determination and foraminiferal faunas in sediment core MD99-2275

    Knudsen, Karen Luise; Sondergaard, M K B; Eiriksson, Jón; Jiang, Hui
    A high-resolution study of palaeoceanographic changes off North Iceland during the time period 8600-5200 cal year BP is based on benthic and planktonic foraminiferal assemblages. The core material (MD99-2275) was obtained from about 440 m water depth on the eastern part of the North Icelandic shelf. Changes in the faunal composition are interpreted to be mainly caused by variations in the strength of the relatively warm, high-salinity Irminger Current and the cold East Icelandic Current, which have been shown to be linked to the climatic changes in the North Atlantic region. Environmental proxies at that site are particularly sensitive to...

  5. Age determination and foraminiferal faunas in sediment core MD99-2275

    Knudsen, Karen Luise; Sondergaard, M K B; Eiriksson, Jón; Jiang, Hui
    A high-resolution study of palaeoceanographic changes off North Iceland during the time period 8600-5200 cal year BP is based on benthic and planktonic foraminiferal assemblages. The core material (MD99-2275) was obtained from about 440 m water depth on the eastern part of the North Icelandic shelf. Changes in the faunal composition are interpreted to be mainly caused by variations in the strength of the relatively warm, high-salinity Irminger Current and the cold East Icelandic Current, which have been shown to be linked to the climatic changes in the North Atlantic region. Environmental proxies at that site are particularly sensitive to...

  6. Paleoenvironmental analysis of sediment core MD03-2601

    Denis, Delphine; Crosta, Xavier; Schmidt, Sabine; Carson, Damien S; Ganeshram, Raja S; Renssen, Hans; Bout-Roumazeilles, Viviane; Zaragosi, Sebastien; Martin, Bernard; Cremer, Michel; Giraudeau, Jaques
    This study presents a high-resolution multi-proxy investigation of sediment core MD03-2601 and documents major glacier oscillations and deep water activity during the Holocene in the Adélie Land region, East Antarctica. A comparison with surface ocean conditions reveals synchronous changes of glaciers, sea ice and deep water formation at Milankovitch and sub-Milankovitch time scales. We report (1) a deglaciation of the Adélie Land continental shelf from 11 to 8.5 cal ka BP, which occurred in two phases of effective glacier grounding-line retreat at 10.6 and 9 cal ka BP, associated with active deep water formation; (2) a rapid glacier and sea...

  7. Paleoenvironmental analysis of sediment core MD03-2601

    Denis, Delphine; Crosta, Xavier; Schmidt, Sabine; Carson, Damien S; Ganeshram, Raja S; Renssen, Hans; Bout-Roumazeilles, Viviane; Zaragosi, Sebastien; Martin, Bernard; Cremer, Michel; Giraudeau, Jaques
    This study presents a high-resolution multi-proxy investigation of sediment core MD03-2601 and documents major glacier oscillations and deep water activity during the Holocene in the Adélie Land region, East Antarctica. A comparison with surface ocean conditions reveals synchronous changes of glaciers, sea ice and deep water formation at Milankovitch and sub-Milankovitch time scales. We report (1) a deglaciation of the Adélie Land continental shelf from 11 to 8.5 cal ka BP, which occurred in two phases of effective glacier grounding-line retreat at 10.6 and 9 cal ka BP, associated with active deep water formation; (2) a rapid glacier and sea...

  8. CaCO3 content, terrigenous components, foraminifera abundance and age of sediment core MD95-2006, Barra Fan, UK

    Knutz, Paul Cornils; Austin, William EN; Jones, E J W
    Lithology, lithic petrology, planktonic foraminiferal abundances, and clastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abundance of ice-rafted debris indicates 16 glacimarine events, including temporal equivalents to Heinrich events 1-4. Enhanced concentrations of basaltic material derived from the British Tertiary Province suggest that the glacimarine sediments record variations in a glacial source on the Hebrides shelf margin. Glacimarine zones are separated by silty intervals with high planktonic foraminifera concentrations that...

  9. CaCO3 content, terrigenous components, foraminifera abundance and age of sediment core MD95-2006, Barra Fan, UK

    Knutz, Paul Cornils; Austin, William EN; Jones, E J W
    Lithology, lithic petrology, planktonic foraminiferal abundances, and clastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abundance of ice-rafted debris indicates 16 glacimarine events, including temporal equivalents to Heinrich events 1-4. Enhanced concentrations of basaltic material derived from the British Tertiary Province suggest that the glacimarine sediments record variations in a glacial source on the Hebrides shelf margin. Glacimarine zones are separated by silty intervals with high planktonic foraminifera concentrations that...

  10. Magnesium/Calcium ratios and sea surface temperature estimation for sediments of the Timor Sea

    Xu, Jian; Kuhnt, Wolfgang; Holbourn, Ann; Andersen, Nils; Bartoli, Gretta
    We use a multiproxy approach to monitor changes in the vertical profile of the Indonesian Throughflow as well as monsoonal wind and precipitation patterns in the Timor Sea on glacial-interglacial, precessional, and suborbital timescales. We focus on an interval of extreme climate change and sea level variation: marine isotope (MIS) 6 to MIS 5e. Paleoproductivity fluctuations in the Timor Sea follow a precessional beat related to the intensity of the Australian (NW) monsoon. Paired Mg/Ca and d18O measurements of surface- and thermocline-dwelling planktonic foraminifers (G. ruber and P. obliquiloculata) indicate an increase of >4°C in both surface and thermocline water...

  11. Magnesium/Calcium ratios and sea surface temperature estimation for sediments of the Timor Sea

    Xu, Jian; Kuhnt, Wolfgang; Holbourn, Ann; Andersen, Nils; Bartoli, Gretta
    We use a multiproxy approach to monitor changes in the vertical profile of the Indonesian Throughflow as well as monsoonal wind and precipitation patterns in the Timor Sea on glacial-interglacial, precessional, and suborbital timescales. We focus on an interval of extreme climate change and sea level variation: marine isotope (MIS) 6 to MIS 5e. Paleoproductivity fluctuations in the Timor Sea follow a precessional beat related to the intensity of the Australian (NW) monsoon. Paired Mg/Ca and d18O measurements of surface- and thermocline-dwelling planktonic foraminifers (G. ruber and P. obliquiloculata) indicate an increase of >4°C in both surface and thermocline water...

  12. Planktonic foraminiferal and stable oxygen isotope record of Holocene sediments from the Norwegian Sea

    Risebrobakken, Bjørg; Jansen, Eystein; Andersson, Carin; Mjelde, Eirik; Hevroy, Kjersti
    High-resolution records from IMAGES core MD95-2011 in the eastern Norwegian Sea provide evidence for relatively large- and small-scale high-latitude climate variability throughout the Holocene. During the early and mid-Holocene a situation possibly driven by consistent stronger westerlies increased the eastward influence of Arctic intermediate and near-surface waters. For the late Holocene a relaxation of the atmospheric forcing resulted in increased influence of Atlantic water. The main changes in Holocene climate show no obvious connection to changing solar irradiance, and spectral analysis reveals no consistent signature for any periodic behavior of Holocene climate at millennial or centennial timescales. There are, however,...

  13. Planktonic foraminiferal and stable oxygen isotope record of Holocene sediments from the Norwegian Sea

    Risebrobakken, Bjørg; Jansen, Eystein; Andersson, Carin; Mjelde, Eirik; Hevroy, Kjersti
    High-resolution records from IMAGES core MD95-2011 in the eastern Norwegian Sea provide evidence for relatively large- and small-scale high-latitude climate variability throughout the Holocene. During the early and mid-Holocene a situation possibly driven by consistent stronger westerlies increased the eastward influence of Arctic intermediate and near-surface waters. For the late Holocene a relaxation of the atmospheric forcing resulted in increased influence of Atlantic water. The main changes in Holocene climate show no obvious connection to changing solar irradiance, and spectral analysis reveals no consistent signature for any periodic behavior of Holocene climate at millennial or centennial timescales. There are, however,...

  14. Carbon and alkenone analysis on sediment core MD97-2151

    Zhao, Meixun; Huang, Chi-Yue; Wang, Chia-Chun; Wei, Ganjian
    We report 150 kyr records of U37K' sea-surface temperature (SST) and carbonate content with 150-200-year sampling resolution from the southern South China Sea (SCS) in the northern margin of the Western Pacific Warm Pool (WPWP) using IMAGES Core MD972151. The glacial/interglacial SST change is about 5 °C for Termination II (23.5 to 28.5°C) and 4°C for Termination I (24 to 28°C). The simultaneous rise of sea level and U37K' SST during Termination I suggests that sea-level change has played an important role in the SCS SST variability by influencing the exchange of tropical ocean warm surface water with the SCS...

  15. Carbon and alkenone analysis on sediment core MD97-2151

    Zhao, Meixun; Huang, Chi-Yue; Wang, Chia-Chun; Wei, Ganjian
    We report 150 kyr records of U37K' sea-surface temperature (SST) and carbonate content with 150-200-year sampling resolution from the southern South China Sea (SCS) in the northern margin of the Western Pacific Warm Pool (WPWP) using IMAGES Core MD972151. The glacial/interglacial SST change is about 5 °C for Termination II (23.5 to 28.5°C) and 4°C for Termination I (24 to 28°C). The simultaneous rise of sea level and U37K' SST during Termination I suggests that sea-level change has played an important role in the SCS SST variability by influencing the exchange of tropical ocean warm surface water with the SCS...

  16. Sedimentology of the Okhotsk Sea

    Nürnberg, Dirk; Tiedemann, Ralf
    On the basis of two sedimentary records from the central Sea of Okhotsk, we reconstruct the closely coupled glacial/interglacial changes in terrigenous flux, marine productivity, and sea ice coverage over the past 1.1 Myr. The correspondance of our sedimentary records to the China loess grain size record (China loess particle timescale, CHILOPARTS) suggests that environmental changes in both the Sea of Okhotsk area and in SE Asia were closely related via the Siberian atmospheric high-pressure cell. During full glacial times our records point to a strong Siberian High causing northerly wind directions, the extension of the sea ice cover, and...

  17. Sedimentology of the Okhotsk Sea

    Nürnberg, Dirk; Tiedemann, Ralf
    On the basis of two sedimentary records from the central Sea of Okhotsk, we reconstruct the closely coupled glacial/interglacial changes in terrigenous flux, marine productivity, and sea ice coverage over the past 1.1 Myr. The correspondance of our sedimentary records to the China loess grain size record (China loess particle timescale, CHILOPARTS) suggests that environmental changes in both the Sea of Okhotsk area and in SE Asia were closely related via the Siberian atmospheric high-pressure cell. During full glacial times our records point to a strong Siberian High causing northerly wind directions, the extension of the sea ice cover, and...

  18. Sea surface reconstruction of sediment cores off West Spitsbergen

    Hald, Morten; Ebbesen, Hanne; Forwick, Matthias; Godtliebsen, Fred; Khomenko, Liza; Korsun, Sergei; Ringstad Olsen, Lena; Vorren, Tore O
    Two sediment cores from the West Spitsbergen area, Euro-Arctic margin, MD99-2304 and MD99-2305, have been investigated for paleoceanographic proxies, including benthic and planktonic foraminifera, benthic foraminiferal stable isotopes and ice rafted debris. Core MD99-2304 is located on the upper continental margin, reflecting variations in the influx of Atlantic Water in the West Spitsbergen Current. Core MD99-2305 is located in Van Mijenfjord, picturing variations in tidewater glacier activity as well as fjord-ocean circulation changes. Surface water warmer than today, was present on the margin as soon as the Van Mijenfjord was deglaciated by 11,200 cal. years BP. Relatively warm water invaded...

  19. Sea surface reconstruction of sediment cores off West Spitsbergen

    Hald, Morten; Ebbesen, Hanne; Forwick, Matthias; Godtliebsen, Fred; Khomenko, Liza; Korsun, Sergei; Ringstad Olsen, Lena; Vorren, Tore O
    Two sediment cores from the West Spitsbergen area, Euro-Arctic margin, MD99-2304 and MD99-2305, have been investigated for paleoceanographic proxies, including benthic and planktonic foraminifera, benthic foraminiferal stable isotopes and ice rafted debris. Core MD99-2304 is located on the upper continental margin, reflecting variations in the influx of Atlantic Water in the West Spitsbergen Current. Core MD99-2305 is located in Van Mijenfjord, picturing variations in tidewater glacier activity as well as fjord-ocean circulation changes. Surface water warmer than today, was present on the margin as soon as the Van Mijenfjord was deglaciated by 11,200 cal. years BP. Relatively warm water invaded...

  20. Sea surface reconstruction of sediment cores off West Spitsbergen

    Hald, Morten; Ebbesen, Hanne; Forwick, Matthias; Godtliebsen, Fred; Khomenko, Liza; Korsun, Sergei; Ringstad Olsen, Lena; Vorren, Tore O
    Two sediment cores from the West Spitsbergen area, Euro-Arctic margin, MD99-2304 and MD99-2305, have been investigated for paleoceanographic proxies, including benthic and planktonic foraminifera, benthic foraminiferal stable isotopes and ice rafted debris. Core MD99-2304 is located on the upper continental margin, reflecting variations in the influx of Atlantic Water in the West Spitsbergen Current. Core MD99-2305 is located in Van Mijenfjord, picturing variations in tidewater glacier activity as well as fjord-ocean circulation changes. Surface water warmer than today, was present on the margin as soon as the Van Mijenfjord was deglaciated by 11,200 cal. years BP. Relatively warm water invaded...

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.