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  • International Polar Year (2007-2008); IPY  (3)
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  • 1
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    Unknown
    Geochemistry of frost flowers and snow obtained near Ahlmann summit, Vestfonna ice cap (2009)
    PANGAEA
    In:  Supplement to: Beaudon, Emilie; Moore, J (2009): Frost flower chemical signature in winter snow on Vestfonna ice cap, Nordaustlandet, Svalbard. The Cryosphere, 3(2), 147-154, https://doi.org/10.5194/tc-3-147-2009
    Details
    Publication Date: 2023-12-13
    Description: The chemistry of snow and ice cores from Svalbard is influenced by variations in local sea ice margin and distance to open water. Snow pits sampled at two summits of Vestfonna ice cap (Nordaustlandet, Svalbard), exhibit spatially heterogeneous soluble ions concentrations despite similar accumulation rates, reflecting the importance of small-scale weather patterns on this island ice cap. The snow pack on the western summit shows higher average values of marine ions and a winter snow layer that is relatively depleted in sulphate. One part of the winter snow pack exhibits a [SO4-/Na+] ratio reduced by two thirds compared with its ratio in sea water. This low sulphate content in winter snow is interpreted as the signature of frost flowers, which are formed on young sea ice when offshore winds predominate. Frost flowers have been described as the dominant source of sea salt to aerosol and precipitation in ice cores in coastal Antarctica but this is the first time their chemical signal has been described in the Arctic. The eastern summit does not show any frost flower signature and we interpret the unusually dynamic ice transport and rapid formation of thin ice on the Hinlopen Strait as the source of the frost flowers.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Mean chemical characteristics and volcano signatures of ice cores from Belukha, the Everest and three Svalbard sites (2012)
    PANGAEA
    In:  Supplement to: Moore, John C; Beaudon, Emilie; Kang, Shichang; Divine, Dmitry V; Isaksson, Elisabeth; Pohjola, Veijo A; van de Wal, Roderik S W (2012): Statistical extraction of volcanic sulphate from nonpolar ice cores. Journal of Geophysical Research, 117(D3), D03306, https://doi.org/10.1029/2011JD016592
    Details
    Publication Date: 2023-12-13
    Description: Ice cores from outside the Greenland and Antarctic ice sheets are difficult to date because of seasonal melting and multiple sources (terrestrial, marine, biogenic and anthropogenic) of sulfates deposited onto the ice. Here we present a method of volcanic sulfate extraction that relies on fitting sulfate profiles to other ion species measured along the cores in moving windows in log space. We verify the method with a well dated section of the Belukha ice core from central Eurasia. There are excellent matches to volcanoes in the preindustrial, and clear extraction of volcanic peaks in the post-1940 period when a simple method based on calcium as a proxy for terrestrial sulfate fails due to anthropogenic sulfate deposition. We then attempt to use the same statistical scheme to locate volcanic sulfate horizons within three ice cores from Svalbard and a core from Mount Everest. Volcanic sulfate is 〈5% of the sulfate budget in every core, and differences in eruption signals extracted reflect the large differences in environment between western, northern and central regions of Svalbard. The Lomonosovfonna and Vestfonna cores span about the last 1000 years, with good extraction of volcanic signals, while Holtedahlfonna which extends to about AD1700 appears to lack a clear record. The Mount Everest core allows clean volcanic signal extraction and the core extends back to about AD700, slightly older than a previous flow model has suggested. The method may thus be used to extract historical volcanic records from a more diverse geographical range than hitherto.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Unknown
    Geodetic and satellite derived ice surface velocities of Vestfonna ice cap (2011)
    PANGAEA
    In:  Supplement to: Pohjola, Veijo A; Christoffersen, Poul; Kolondra, Leszek; Moore, John C; Pettersson, Rickard; Schäfer, Martina; Strozzi, Tazio; Reijmer, Carleen H (2011): Spatial distribution and change in the surface ice-velocity field of Vestfonna ice cap, Nordaustlandet, Svalbard, 1995-2010 using geodetic and satellite interferometry data. Geografiska Annaler Series A-Physical Geography, 93(4), 323-335, https://doi.org/10.1111/j.1468-0459.2011.00441.x
    Details
    Publication Date: 2023-12-13
    Description: During 2007 we launched a geodetic campaign on the Svalbard ice cap Vestfonna in order to estimate the velocity field of the ice cap. This was done within the frame of the IPY project KINNVIKA. We present here the velocity measurements derived from our campaigns 2007-2010 and compare the geodetic measurements against InSAR velocity fields from satellite platforms from 1995/96 and 2008. We find the spatial distribution of ice speeds from the InSAR is in good agreement within the uncertainty limits with our geodetic measurements. We observe no clear indication of seasonal ice speed differences, but we find a speed-up of the outlet glacier Franklinbreen between the InSAR campaigns, and speculate the outlet is having a surge phase.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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