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  • 1
    Digitale Medien
    Digitale Medien
    Evidence for the Hudson River as the dominant source of sand on the US Atlantic Shelf (1990)
    [s.l.] : Nature Publishing Group
    Nature 346 (1990), S. 828-831 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The use of geochemical data from the ilmenite-haematite-titanomagnetite opaque minerals avoids several problems commonly encountered in provenance studies3. For example, selective removal by winnowing is greatly reduced because of the relatively narrow density range of this group4. Also, these ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/346828a0
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    Artikel (Nationallizenzen)
    Volltext
  • 2
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    Unbekannt
    Glacial shortcut of Arctic sea-ice transport (2012)
    Elsevier
    In:  EPIC3Earth and Planetary Science Letters, Elsevier, 357-35, pp. 257-267
    Details
    Publikationsdatum: 2019-07-16
    Beschreibung: Due to the lack of data, the extent, thickness and drift patterns of sea ice and icebergs in the glacial Arctic remains poorly constrained. Earlier studies are contradictory proposing either a cessation of the marine cryosphere or an ice drift system operating like present-day. Here we examine the marine Arctic cryosphere during the Last Glacial Maximum (LGM) using a high-resolution, regional ocean-sea ice model. Whereas modern sea ice in the western Arctic Basin can circulate in the Beaufort Gyre for decades, our model studies present an extreme shortcut of glacial ice drift. In more detail, our results show a clockwise sea-ice drift in the western Arctic Basin that merges into a direct trans-Arctic path towards Fram Strait. This is consistent with dated ice plow marks on the seafloor, which show the orientation of iceberg drift in this direction. Also ice-transported iron-oxide grains deposited in Fram Strait, can be matched by their chemical composition to similar grains found in potential sources from the entire circum-Arctic. The model results indicate that the pattern of Arctic sea-ice drift during the LGM is established by wind fields and seems to be a general feature of the glacial ocean. Our model results do not indicate a cessation in ice drift during the LGM.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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    ARTIKEL (OA)
  • 3
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    HLY0503 Cruise Report (2005)
    Old Dominion University
    In:  EPIC3Norfolk, VA 23529, USA, Old Dominion University
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: PANGAEA Documentation , notRev
    Format: application/pdf
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    ARTIKEL (OA)
  • 4
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    Past glacial and interglacial conditions in the Arctic Ocean and marginal seas - a review (2006)
    Elsevier
    In:  Progress in Oceanography, 71 (2-4). pp. 129-144.
    Details
    Publikationsdatum: 2020-12-31
    Beschreibung: Past changes in the Arctic Ocean and its marginal seas have been profound, even during the last 10,000 years. Understanding these changes, such as those occurring during the transition from glacial to interglacial climates, are important for research on modern processes, because this knowledge provides a framework and unique perspective in which to view the modern physical and biological processes. This paper discusses our current understanding of past environmental change and processes relative to those currently in progress. Special emphasis is placed on the most recent transition from a glacial state to the modern interglacial conditions.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.pocean.2006.09.009
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 5
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    (Table 1) Ice drift distances and times based on a reconstruction of the Arctic Ocean at 15 Ma and today (Exp302, ACEX) (2009)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-02
    Schlagwort(e): 302-CompSite; Arctic Coring Expedition, ACEX; Area/locality; Calculated, see reference(s); CCGS Captain Molly Kool (Vidar Viking); Comment; COMPCORE; Composite Core; Distance; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; LATITUDE; Length/duration of interval; LONGITUDE; ORDINAL NUMBER
    Materialart: Dataset
    Format: text/tab-separated-values, 134 data points
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    DATA PANGAEA
  • 6
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    (Table 2) Comparison of primary grain sources for Exp302 (ACEX) core site and cores 94BC28 and PS1230 (2009)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-02
    Schlagwort(e): 302-CompSite; Arctic Coring Expedition, ACEX; Area/locality; Calculated, see reference(s); CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; ORDINAL NUMBER; Percentage; Standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 84 data points
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    DATA PANGAEA
  • 7
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    Drift distances, times and primary grain sources of the Arctic Ocean, Exp302 (ACEX) (2009)
    PANGAEA
    In:  Supplement to: Darby, Dennis A (2008): Arctic perennial ice cover over the last 14 million years. Paleoceanography, 23, PA1S07, https://doi.org/10.1029/2007PA001479
    Details
    Publikationsdatum: 2023-03-02
    Beschreibung: Knowledge of the long-term history of the perennial ice is an important issue that has eluded study because the Cenozoic core material needed has been unavailable until the recent Arctic Coring Expedition (ACEX). Detrital Fe oxide mineral grains analyzed by microprobe from the last 14 Ma (164 m) of the ACEX composite core on the Lomonosov Ridge were matched to circum-Arctic sources with the same mineral and 12-element composition. These precise source determinations and estimates of drift rates were used to determine that these sand grains could not be rafted to the ACEX core site in less than a year. Thus the perennial ice cover has existed since 14 Ma except for the unlikely rapid return to seasonal ice between the average sampling interval of about 0.17 Ma. Both North America and Russia contributed significant Fe grains to the ACEX core during the last 14 Ma.
    Schlagwort(e): 302-CompSite; Arctic Coring Expedition, ACEX; CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Materialart: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 8
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    A comparison between multi-proxy and historical data of drift-ice conditions on the East Greenland shelf
    PANGAEA
    In:  Supplement to: Alonso-Garcia, Montserrat; Andrews, John T; Belt, Simon T; Cabedo-Sanz, Patricia; Darby, Dennis A; Jaeger, John (2013): A comparison between multiproxy and historical data (AD 1990-1840) of drift ice conditions on the East Greenland Shelf ( 66 N). The Holocene, 23(12), 1672-1683, https://doi.org/10.1177/0959683613505343
    Details
    Publikationsdatum: 2023-05-12
    Beschreibung: The reduction in sea ice along the SE Greenland coast during the last century has severely impacted ice-rafting to this area. In order to reconstruct ice-rafting and oceanographic conditions in the area of Denmark Strait during the last ~150 years, we conducted a multiproxy study on three short (20 cm) sediment cores from outer Kangerdlugssuaq Trough (~300 m water depth). The proxy-based data obtained have been compared with historical and instrumental data to gain a better understanding of the ice sheet-ocean interactions in the area. A robust chronology has been developed based on 210Pb and 137Cs measurements on core PO175GKC#9 (~66.2°N, 32°W) and expanded to the two adjacent cores based on correlations between calcite weight percent records. Our proxy records include sea-ice and phytoplankton biomarkers, and a variety of mineralogical determinations based on the 〈2 mm sediment fraction, including identification with quantitative x-ray diffraction, ice-rafted debris counts on the 63-150 µm sand fraction, and source identifications based on the composition of Fe oxides in the 45-250 µm fraction. A multivariate statistical analysis indicated significant correlations between our proxy records and historical data, especially with the mean annual temperature data from Stykkishólmur (Iceland) and the storis index (historical observations of sea-ice export via the East Greenland Current). In particular, the biological proxies (calcite weight percent, IP25, and total organic carbon %) showed significant linkage with the storis index. Our records show two distinct intervals in the recent history of the SE Greenland coast. The first of these (ad 1850-1910) shows predominantly perennial sea-ice conditions in the area, while the second (ad 1910-1990) shows more seasonally open water conditions.
    Materialart: Dataset
    Format: application/zip, 7 datasets
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    DATA PANGAEA
  • 9
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    Fe grain geochemical provenance data for Denmark Strait (2017)
    PANGAEA
    In:  Supplement to: Darby, Dennis A; Andrews, John T; Belt, Simon T; Jennings, Anne E; Cabedo-Sanz, Patricia (2017): Holocene cyclic records of ice-rafted debris and sea ice variations on the East Greenland and Northwest Iceland margins. Arctic, Antarctic, and Alpine Research, 49(4), 649-672, https://doi.org/10.1657/AAAR0017-008
    Details
    Publikationsdatum: 2023-01-13
    Beschreibung: The dynamics of the Greenland Ice Sheet and drift of sea ice from the Arctic Ocean reaching Denmark Strait are poorly constrained. We present data on the provenance of Fe oxide detrital grains from two cores in the Denmark Strait area and compare the Fe grain source data with other environmental proxies. Based on their Fe grain geochemistry the sediments can be traced to regional East Greenland sources and to sites around the Arctic Basin. On both the 2 and 11 cal ka BP time-scales in the two cores, the environmental proxies revealed coherent relationships with new IP25 data and quartz weight percent being positively associated with T°C and inversely associated with biogenic carbonate wt.%. Trends in the data were obtained from Singular Spectrum Analysis (SSA) and residuals were tested for cyclicity. Trends on the environmental proxies explained between 15 and 90% of the variance. At both sites the primary Fe grain sources were from Greenland, but significant contributions were also noted from Banks Island and Svalbard. There is a prominent cyclicity of 800 yrs as well as other less prominent cycles for both Greenland and Arctic sources.
    Materialart: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 10
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    Component NRM Directions for two sediment cores from the Arctic Ocean (2013)
    PANGAEA
    In:  Supplement to: Xuang, Chuang; Channell, James E T; Polyak, Leonid; Darby, Dennis A (2012): Paleomagnetism of Quaternary sediments from Lomonosov Ridge and Yermak Plateau: implications for age models in the Arctic Ocean. Quaternary Science Reviews, 32, 48-63, https://doi.org/10.1016/j.quascirev.2011.11.015
    Details
    Publikationsdatum: 2023-01-13
    Beschreibung: Inclination patterns of natural remanent magnetization (NRM) in Quaternary sediment cores from the Arctic Ocean have been widely used for stratigraphic correlation and the construction of age models, however, shallow and negative NRM inclinations in sediments deposited during the Brunhes Chron in the Arctic Ocean appear to have a partly diagenetic origin. Rock magnetic and mineralogical studies demonstrate the presence of titanomagnetite and titanomaghemite. Thermal demagnetization of the NRM indicates that shallow and negative inclination components are largely "unblocked" below ~300 °C, consistent with a titanomaghemite remanence carrier. Following earlier studies on the Mendeleev-Alpha Ridge, shallow and negative NRM inclination intervals in cores from the Lomonosov Ridge and Yermak Plateau are attributed to partial self-reversed chemical remanent magnetization (CRM) carried by titanomaghemite formed during seafloor oxidation of host (detrital) titanomagnetite grains. Distortion of paleomagnetic records due to seafloor maghemitization appears to be especially important in the perennially ice covered western (Mendeleev-Alpha Ridge) and central Arctic Ocean (Lomonosov Ridge) and, to a lesser extent, near the ice edge (Yermak Plateau). On the Yermak Plateau, magnetic grain size parameters mimic the global benthic oxygen isotope record back to at least marine isotope stage 6, implying that magnetic grain size is sensitive to glacial-interglacial changes in bottom-current velocity and/or detrital provenance.
    Materialart: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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