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Datasets of project "Global Environmental Change: The Northern North Atlantic"

Mostrando recursos 1 - 20 de 1.330

  1. "Berichte aus dem Sonderforschungsbereich 313, Veränderungen der Umwelt - Der Nördliche Nordatlantik" in Open Access (1991-1998) ISSN 0942-119X


  2. "Berichte aus dem Sonderforschungsbereich 313, Sedimentation im europäischen Nordmeer" in Open Access (1985-1990) ISSN 0179-1397


  3. Flux rates from the Atlantic and Polar provinces

    Peinert, Rolf; Antia, Avan N; Bauerfeind, Eduard; von Bodungen, Bodo; Haupt, Olaf; Krumbholz, Marita; Peeken, Ilka; Ramseier, René O; Voß, Maren; Zeitzschel, Bernt
    A decade of particle flux measurements providse the basis for a comparison of the eastern and western province s of the Nordic Seas. Ice-related physical and biological seasonality as well as pelagic settings jointly control fluxes in the western Polar Province which receive s southward flowing water of Polar origin. Sediment trap data from this realm highlight a predominantly physical flux control which leads to exports of siliceous particle s within the biological marginal ice zone as a prominent contributor. In the northward flowing waters of the eastern Atlanti c Province, feeding strategies, life histories and the succession ofdominant mesozooplankters...

  4. Table 2: Age information for the analyzed cores

    Hass, H Christian; Andruleit, Harald; Baumann, Astrid; Baumann, Karl-Heinz; Kohly, Alexander; Jensen, Stefan; Matthiessen, Jens; Samtleben, Christian; Schäfer, Priska; Schröder-Ritzrau, Andrea; Thiede, Jörn
    Five plankton groups, including diatoms, radiolarians, coccolithophores, foraminifers, and dinoflagellate cysts, were synoptically analyzed in six sediment cores and two sediment traps from the Norwegian-Greenland Sea and the North Atlantic in order to provide more detailed insights into the paleoclimatic and paleoceanographic evolution and the development of plankton assemblages of the northern North Atlantic during the last 15,000 years. Based on Q-mode factor analyses, cold, warm, transitional, and relict assemblages were calculated for each of the plankton groups. Data from the different plankton groups complement one another, although they are not always consistent. However, the multiple plankton-group data set is...

  5. Stable oxygen isotope in opal and seawater

    Anders, Tania-Maria
    Sauerstoff-Isotopenuntersuchungen wurden an frischem Diatomeenopal aus der obersten Wassersäule, Diatomeen aus Kulturen, sowie an sedimentärem Diatomeenopal durchgeführt, um die Anwendbarkeit von d18O-Signalen aus marinen Diatomeen für paläozeanographische Fragestellungen zu untersuchen. Diatomeenopal ist, besonders aus Sedimentproben, schwierig anzureichern. Physikalische und chemische Verfahren müssen mehrfach angewendet werden, um Proben zu erhalten, die den für Sauerstoff-Isotopenmessungen erforderlichen Reinheitsgrad aufweisen. Die Ausgangskonzentration an Diatomeen im Probenmaterial wirkt sich hierbei erheblich auf den Erfolg der Reinigung aus. Verläßliche und reproduzierbare d18O-Werte können nur an sehr reinen Diatomeenproben bestimmt werden. Mittels mikroskopischer Untersuchungen (Durchlichtmikroskopie, Rasterelektronenrnikroskopie), Röntgendiffraktametrie und geochernischer Analysen am ICP-MS können z.T. Art und Menge von Verunreinigungen...

  6. Geochemical investigations of sediment profiles in the Norwegian-Greenland Sea

    Voelker, Antje H L
    High-, i.e. 15-140-yr-resolution climate records from sediment cores 23071, 23074, and PS2644 from the Nordic Seas were used to recon:;truct changes in the surface and deep water circulation during marine isotope stages 1-5.1, i.e. the last 82 000 yr. From this the causal links between the paleoceanographic signals and the Dansgaard-Oeschger events 1-21 revealed in 0180-ice-core records from Greenland were determined. The stratigraphy of the cores is based on the planktic 0180 curves, the minima of which were directly correlated with the GISP2-0180 record, numerous AMS 14C ages, and some ash layers. The planktic d18O and dl3C curves of all three...

  7. Integrated Data Sets of the DFG Research Project SFB 313, Environmental Change: The Northern North Atlantic

    Grobe, Hannes; Diepenbroek, Michael; Schäfer, Priska; Schindler, Uwe; Thiede, Jörn; Wefer, Gerold
    During the years 1985 to 1998 a special research project (SFB313) was carried out at the Christian Albrechts University, Kiel named ,Sedimentation im europäischen Nordmeer' (1985-1990), later renamed ,Veränderungen der Umwelt: Der nördliche Nordatlantik' (1990-1998, The Northern North Atlantic, a Changing Environment). Most of the data coming out from the SFB313 have been compiled, harmonized and archived in the PANGAEA information system. With the first volume of the ,WDC-MARE Reports ' a consistent collection of 1186 datasets with related metadata was exported from PANGAEA and is published on CD-ROM. The link below will load an iso-image which allows to burn...

  8. Investigation of N. pachyderma from the North Atlantic

    Bauch, Dorothea; Darling, Kate; Simstich, Johannes; Bauch, Henning A; Erlenkeuser, Helmut; Kroon, Dick
    The shells of the planktonic foraminifer Neogloboquadrina pachyderma have become a classical tool for reconstructing glacial-interglacial climate conditions in the North Atlantic Ocean. Palaeoceanographers utilize its left- and right-coiling variants, which exhibit a distinctive reciprocal temperature and water mass related shift in faunal abundance both at present and in late Quaternary sediments. Recently discovered cryptic genetic diversity in planktonic foraminifers now poses significant questions for these studies. Here we report genetic evidence demonstrating that the apparent 'single species' shell-based records of right-coiling N. pachyderma used in palaeoceanographic reconstructions contain an alternation in species as environmental factors change. This is reflected...

  9. Investigation of planktic foraminifera from the Norwegian-Greenland Sea

    Simstich, Johannes; Sarnthein, Michael; Erlenkeuser, Helmut
    The vertical density gradients in the Nordic Seas are crucial for the preconditioning of the surface water to thermohaline sinking in winter. These gradients can be reconstructed from paired oxygen isotope data in tests of different species of planktonic foraminifera, the isotopic signatures of which represent different calcification depths in the water column. Comparison of d18O values from foraminiferal tests in plankton hauls, sediment traps, and nearby core top samples with the calculated d18Ocalcite profile of the water column revealed species-specific d18O vital effects and the role of bioturbational admixture of subfossil specimens into the surface sediment. On the basis...

  10. Organic carbon flux and remineralization in surface sediments

    Sauter, Eberhard-Jürgen; Schlüter, Michael; Suess, Erwin
    Organic carbon fluxes through the sediment/water interface in the high-latitude North Atlantic were calculated from oxygen microprofiles. A wire-operated in situ oxygen bottom profiler was deployed, and oxygen profiles were also measured onboard (ex situ). Diffusive oxygen fluxes, obtained by fitting exponential functions to the oxygen profiles, were translated into organic carbon fluxes and organic carbon degradation rates. The mean Corg input to the abyssal plain sediments of the Norwegian and Greenland Seas was found to be 1.9 mg C/m**2/d. Typical values at the seasonally ice-covered East Greenland continental margin are between 1.3 and 10.9 mg C/m**2/d (mean 3.7 mg...

  11. Age determination and stable isotope record of foraminifera of sediment core SO82_5-2

    van Kreveld, Shirley A; Sarnthein, Michael; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Jung, Simon J A; Pflaumann, Uwe; Voelker, Antje H L
    Surface and deepwater paleoclimate records in Irminger Sea core SO82-5 (59°N, 31°W) and Icelandic Sea core PS2644 (68°N, 22°W) exhibit large fluctuations in thermohaline circulation (THC) from 60 to 18 calendar kyr B.P., with a dominant periodicity of 1460 years from 46 to 22 calendar kyr B.P., matching the Dansgaard-Oeschger (D-O) cycles in the Greenland Ice Sheet Project 2 (GISP2) temperature record [Grootes and Stuiver, 1997, doi:10.1029/97JC00880]. During interstadials, summer sea surface temperatures (SSTsu) in the Irminger Sea averaged to 8°C, and sea surface salinities (SSS) averaged to ~36.5, recording a strong Irminger Current and Atlantic THC. During stadials, SSTsu...

  12. Flux data in the Greenland Basin

    von Bodungen, Bodo; Antia, Avan N; Bauerfeind, Eduard; Haupt, Olaf; Koeve, Wolfgang; Machado, E; Peeken, Ilka; Peinert, Rolf; Reitmeier, Sven; Thomsen, C; Voß, Maren; Wunsch, M; Zeller, Ute; Zeitzschel, Bernt
    Pelagic processes and their relation to vertical flux have been studied in the Norwegian and Greenland Seas since 1986. Results of long-term sediment trap deployments and adjoining process studies are presented, and the underlying methodological and conceptional background is discussed. Recent extension of these investigations at the Barents Sea continental slope are also presented. With similar conditions of input irradiation and nutrient conditions, the Norwegian and Greenland Seas exhibit comparable mean annual rates of new and total production. Major differences can be found between these regions, however, in the hydrographic conditions constraining primary production and in the composition and seasonal...

  13. Benthic foraminifera of late Quaternary sediments in the northern North Atlantic

    Nees, Stefan
    Four long sediment cores from locations in the Framstrait, the Norwegian-Greenland Seas and the northern North Atlantic were analysed in a high resolution sampling mode (1 - 2 cm density) for their benthic foraminiferal content. In particular the impact of the intense climatic changes at glacial/interglacial transitions (terminations I and II) on the benthic community have been of special interest. The faunal data were investigated by means of multivariate analysis and represented in their chronological occurence. The most prominent species of benthic foraminifera in the Norwegian-Greenland Seas are Oridorsalis umbonatus, Cibicidoides wuellerstorfi, the group of Cassidulina, Pyrgo rotalaria, Globocassidulina subglobosa and...

  14. Diversity of polycheata fauna in surface sediments of the east Greenland continental slope

    Schnack, Klaus; Piepenburg, Dieter

  15. Sedimentology in surface sediments of the east Greenland continental slope

    Schnack, Klaus; Piepenburg, Dieter; Ritzrau, Will

  16. Physical oceanography of bottom water of the east Greenland continental slope

    Schnack, Klaus; Piepenburg, Dieter; Budéus, Gereon

  17. Relative biomass of feeding types of polychaeta abundance in surface sediments of the east Greenland continental slope (2000m section)

    Schnack, Klaus; Piepenburg, Dieter

  18. Relative biomass of feeding types of polychaeta abundance in surface sediments of the east Greenland continental slope (79° N section)

    Schnack, Klaus; Piepenburg, Dieter

  19. Relative abundance of feeding types of polychaeta abundance in surface sediments of the east Greenland continental slope (2000m section)

    Schnack, Klaus; Piepenburg, Dieter

  20. Relative abundance of feeding types of polychaeta abundance in surface sediments of the east Greenland continental slope (79° N section)

    Schnack, Klaus; Piepenburg, Dieter

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