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    Wyświetlanie 1-4 z 4
    Tytuł:
    Recesja lądolodów i lodowców oraz degradacja wieloletniej zmarzliny
    Recession of ice sheets and glaciers and the degradation of permafrost
    Autorzy:
    Zwoliński, Zbigniew
    Dobiński, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/1196935.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    Polar regions are an object of study of several disciplines, including cryology. The cryosphere embraces snow cover, sea ice, ice sheets, shelf ice, glaciers and ice caps, permafrost, as well as river and lake ice. The aim of the present paper is to address problems of the distribution and disappearance of glaciers and permafrost as an effect of the observed climate change leading primarily to a warming of the polar zones. Glacier ice found on the surface of the Earth is one of the most sensitive geoindicators of the climate change taking place in the geosphere. There is some inertia in the observable and measurable response of glacier systems relative to the change. It is estimated that for the Marine Antarctic region the delay may be some 25 years. Another feature characteristic of the recession of ice sheets and glaciers is the different rate of retreat of their fronts depending on location: ice sheets and glaciers ending on land usually display a much slower recession rate than those reaching the sea. This is combined with local, regional and global weather anomalies in temperature and precipitation which, together with the features of the bedrock, can sometimes seriously affect the recession pattern of individual glaciers. In the article examples are given of glacier recession in Greenland, Spitsbergen, Antarctica, and the Antarctic Peninsula. The areas emerging from under the ice are among the fastest, most dynamically evolving ones in the world, undergoing processes of geosuccession. Apart from an increase in the thickness of the active layer, a rise in the temperature of permafrost itself can be observed. What favours the penetration of heat into the ground is the increasingly frequent absence of snow cover, or a clear reduction in its thickness. Those changes make continuous permafrost pass into discontinuous and then sporadic permafrost. In the Arctic regions permafrost degradation has the greatest impact on construction and network infrastructure, like roads, railway lines, and telecommunication facilities. Higher air temperatures, the recession of glaciers, a lower depth of freezing, and changes in the amount and quality of precipitation lead primarily to a shift of the climatic-vegetation zones northwards and the climatic- vegetation altitude zones upwards. This situation has brought about an extension of the growing season by 30-40%. The result has been geoecological transformations among the glacial, proglacial, periglacial and paraglacial systems at a variety of spatiotemporal scales that form the present-day landscape structure of the polar zones in the northern and southern hemispheres, and in high-altitude area.
    Źródło:
    Kosmos; 2008, 57, 3-4; 209-224
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probable two-layered permafrost formation, as a result of climatic evolution in mountainous environment of Storglaciären forefield, Tarfala, Northern Scandinavia
    Autorzy:
    Dobiński, Wojciech
    Glazer, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2042116.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Scandinavia
    permafrost evolution
    two-layered permafrost
    ERT
    Źródło:
    Polish Polar Research; 2018, 39, 2; 177-209
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-method geophysical mapping of ground properties and periglacial geomorphology in Hans Glacier forefield, SW Spitsbergen
    Autorzy:
    Marciniak, Artur
    Osuch, Marzena
    Wawrzyniak, Tomasz
    Owoc, Bartosz
    Dobiński, Wojciech
    Glazer, Michał
    Majdański, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/16538466.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Arctic
    Svalbard
    geophysical imaging
    periglacial environment
    glacial landforms
    Opis:
    This article presents the results of a geophysical survey from which detailed images of glacial and periglacial landforms and subsurface structures were obtained. Sediments and landforms on newly deglaciated terrain can be used to reconstruct the extent and character of glaciers in the past and add to the understanding of their response to climate and environmental changes. To derive spatial information from complex geomorphological terrain, joint interpretation of three non-intrusive geophysical methods were applied: Electrical Resistivity Tomography (ERT), Ground Penetrating Radar (GPR), and time-lapse Seismic Tomography. These were used to identify subsurface structures in the forefield of the retreating Hans Glacier in SW Spitsbergen, Svalbard. Three main zones were distinguished and described: outwash plain, terminal moraine from the last glacial maximum, and glacial forefield proximal to the glacier front. Geophysical profiles across these zones reveal information on glacio-fluvial sediment thickness and structure, ice thickness and structure, and bedrock topography. The freezing-thawing effect of the active layer has a strong and deep impact, as demonstrated by variations in P-wave velocity in the obtained outcomes. The results are discussed in the context of the current climate in Svalbard. This study provides a snapshot of ground parameters and the current state of the subsurface in southern Spitsbergen. The boundary between sediment-bedrock layers was estimated to be from 5 to 20 m in depth. It is the first such extensive description of periglacial structures in the forefield of the Hans Glacier, utilising the longest ERT profile (1500 m) in Svalbard together with deep GPR and precise seismic tomography.
    Źródło:
    Polish Polar Research; 2022, 43, 2; 101-123
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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