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  • 1
    Publikationsdatum: 2023-05-12
    Beschreibung: Sea ice is an integral part of the climate system of the high latitude regions. Up to now, control of its occurrence and extent, especially its interannual and long-term variability, has proved difficult to isolate or quantify, especially in the data devoid regions of the Southern Ocean. The consequences of climate change induced, for example, by the continued increase of greenhouse gases, on the occurrence of sea ice, is even less certain, although the theory at least suggests that sea ice extent changes could be expected to have a positive feedback role, i.e. that reduced ice extent could be expected to enhance warming at high latitudes. The interaction of sea ice with the polar ocean and atmosphere can be summerized as follows: - The snow covered sea ice reflects the solar illumination much stronger compared to open water areas. Therefore, changes in the horizontal coverage of sea ice (ice concentration) would be related to changes of the surface reflectivity. In the polar winter, sea ice isolates the ocean from the cold polar atmosphere and reduces the heat transfer by one or two orders. Both has a strong impact on the radiation balance. - Sea ice growth and melting has a signinficant influence on the circulation of the oceans. The formation of sea ice increases the water density of the ocean boundary layer due to rejection of brine. This results in an unstable stratification of the ocean layer and deep water formation can occure. The opposite behaviour can be observed when sea ice melts. The additional freshwater causes the ocean to form a stable boundary layer.
    Schlagwort(e): Date/time end; Date/time start; Description; OBSE; Observation; ORDINAL NUMBER; PELICON; Southern Ocean; Uniform resource locator/link to raw data file
    Materialart: Dataset
    Format: text/tab-separated-values, 160 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
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    Unbekannt
    PANGAEA
    In:  Supplement to: Carlsen, Tim; Birnbaum, Gerit; Ehrlich, André; Freitag, Johannes; Heygster, Georg; Istomina, Larysa; Kipfstuhl, Sepp; Orsi, Anais J; Schäfer, Michael; Wendisch, Manfred (2017): Comparison of different methods to retrieve optical-equivalent snow grain size in central Antarctica. The Cryosphere, 11(6), 2727-2741, https://doi.org/10.5194/tc-11-2727-2017
    Publikationsdatum: 2023-10-28
    Beschreibung: The data contain time series of snow specific surface area (SSA) retrieved from spectral surface albedo and reflectance measurements of different remote sensing instruments at Kohnen research station (Antarctica, 75° 0' S, 0° 4' E, 2892 m above sea level) operated by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) between 10 December 2013 and 31 January 2014. Snow SSA was retrieved from (1) ground-based spectral surface albedo measurements (ratio between 1280 nm and 1100 nm wavelength) collected by the COmpact RAdiation measurement System (CORAS), (2) airborne spectral albedo measurements (1280 nm/1100 nm) with the Spectral Modular Airborne Radiation measurement sysTem (SMART) mounted on the Polar 6 research aircraft operated by AWI, and (3) spaceborne reflectance measurements (469 nm, 858 nm, 1240 nm) by the MODerate Resolution Imaging Spectroradiometer (MODIS).
    Schlagwort(e): DATE/TIME; Day of study; Dronning Maud Land, Antarctica; Kohnen; Kohnen_based; Kohnen Station; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Research station; RS; Specific surface area, snow; Specific surface area, snow, error; SPP1158
    Materialart: Dataset
    Format: text/tab-separated-values, 356 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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