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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effects of recent cooling in the Antarctic Peninsula on snow density and surface mass balance
    Autorzy:
    Recio-Blitz, Cayetana
    Navarro, Francisco J.
    Otero, Jaime
    Lapazaran, Javier
    Gonzalez, Sergi
    Powiązania:
    https://bibliotekanauki.pl/articles/2041910.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctica
    Livingston Island
    glacier snow cover
    compaction
    air temperature
    Źródło:
    Polish Polar Research; 2018, 39, 4; 457-480
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związek krótkookresowych zmian miąższości pokrywy śnieżnej na Lodowcu Avatsmarka (NW Spitsbergen) z parametrami meteorologicznymi wiosną 2001 i 2002 roku
    The relations between short-term changes of the snow thickness on Aavatsmark Glacier (NW Spitsbergen) and meteorological parameters in spring seasons 2001 and 2002
    Autorzy:
    Grabiec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260686.pdf
    Data publikacji:
    2004
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    pokrywa śnieżna
    lodowce
    Lodowiec Avatsmarka
    snow cover
    Aavatsmark Glacier
    Opis:
    The work has been intended to determine relations between short-term changes of the snow cover thickness on the glacier and meteorological parameters recorded on the glacier and in the glacier vicinity. Short-term relations are regarded as connections between variations of the snow depth on the glacier and the course of meteorological factors in a scale of up to 24-hours. Detailed snow and meteorological measurements were carried out on the equilibrium line (364 m a.s.l.) of Aavatsmark Glacier (NW Spitsber-gen) in two periods: 11 - 30th April 2001 and 12th April - 5th May 2002. The thickness of snow was investigated with the use of Sonic Ranging Sensor SR50 Campbell Scientific Ltd. Meteorological data comes from an automatic weather station located on the glacier?s surface and from meteorological sites on Kaffioyra and Ny-Alesund. All measurements were taken in 10-minute step. Short-term changes of the snow thickness on glaciers in winter seasons are influenced by the precipitation and snow transport. The wind power determines the scale of snow transport. In consequence, the increase of wind speed causes higher intensity of changes of the snow level. The intensity of changes of the snow depth within the range from 0 to 8ˇ10-6 m/s is connected with the average wind speed of 4 m/s and changes intensity over 17ˇ10-6 m/s accompanied the average wind speed 8.7 m/s. The appearance of precipitation in daily or longer time-scale causes the increase of snow thickness and the weakness of relations between changes of the snow depth and the wind speed. In a time-scale of several hours the snow supply leads to the increase of both intensity and amplitude of snow level changes. Significant increase of the intensity and amplitude of changes of snow depth took place over the average wind speed 5 m/s in days without precipitation and over 8 m/s in days with snowfall. Short-term changes of the snow thickness are constrained by availability of an unconsolidated, easy-to-transport material. The major part of that material comes from precipitation. As a result short-term changes of the snow depth are more noticeable during days with precipitation. A thin crust layer on the snow surface has been formed as a result of friction of air masses and snow particles. In emergence of the positive tempe-rature and good radiation conditions in the upper snow layer ice crust can be formed. After stabilization of the snow cover even powerful wind gust can?t start transporting the material and short-term changes of the snow thickness are limited.
    Źródło:
    Problemy Klimatologii Polarnej; 2004, 14; 107-126
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie albedo Lodowca Scotta (W Spitsbergen)
    The 'Albedo' differentiation at Scott's Glacier (W Spitsbergen)
    Autorzy:
    Siwek, K.
    Gluza, A.
    Bartoszewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260684.pdf
    Data publikacji:
    2004
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    pokrywa śnieżna
    ablacja
    Lodowiec Scotta
    Spitsbergen
    snow cover
    ablation
    Scott's Glacier
    Opis:
    The aim of the present study was the quantitative determination of ?albedo? which is a significant factor influencing the balance of short-wave radiation. The value of surface albedo allows to determine its role in the heat balance of the active surface which in turns influences the ablation level. Studies on the accumulation and ablation conditions of the snow cover commenced on Scott?s Glacier in 1987. On average, the thickness of the frontal part decreased by 75 m, i.e. 2.7 m annually. Decession of the glacier was confirmed by studies carried out in 2001 during which it was found that Scott?s Glacier had decreased in its surface area by over 10% in the period 1986?2001. Three types of active surfaces, i.e.: land, ice and water, play a significant role in the radiation balance of the Arctic. During the summer months practically all the heat reaching the surface of the earth is taken up in thawing the ice. In the summer of 2001, a substantial variation of albedo occurred on Scott?s Glacier. The above changes depended to a large extent on the physical properties of the glacier?s surface. High spatial differentiation of albedo was also observed in the period studied (i.e. the summer of 2001). The lowest values (15-25%) occurred at the front of the glacier which was covered with ice and numerous kryokonite smelts filled with water or polluted with morenic or eolic material. Somewhat higher values (40-60%) were found in the supraglacial river valleys and in the zone of surface water deposits as they turned into slush. The highest albedo values occurred in the firn field where leveled snow, often firn, or fresh wind-blown snow was deposited (60-85%). After the precipitation of the fresh, clean snow, albedo increased and reached values above 88%.
    Źródło:
    Problemy Klimatologii Polarnej; 2004, 14; 127-132
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metamorfoza pokrywy śnieżnej w rejonie południowego Spitsbergenu w sezonie 1992/1993
    Metamorphosis of the snow cover in South Spitsbergen in the season 1992-1993
    Autorzy:
    Leszkiewicz, J.
    Głowacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/260967.pdf
    Data publikacji:
    2001
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    lodowce
    badania śniegu
    pokrywa śnieżna
    Spitsbergen
    cyrkulacja atmosfery
    glacier
    snow cover
    snow research
    atmospheric circulation
    Opis:
    Winter snow cover in south Spitsbergen is modelled by three main factors: snow precipitation, strong winds which blow out large amounts of snow (locally snow deposition occurs) and winter thaws of short duration. Slight snow melting during thaws causes development of ice-crust layers in a frozen snow cover. The ice-crust protects snow cover from blowing out. Moreover, ice-crust layers are very important in the investigations of snow stratigraphy. In the winter snow cover of 1992/1993, eight layers of ice-crust were observed. The occurrence of atmospheric precipitation is highly associated with the type of atmospheric circulation in the area of south Spitsbergen. In the analysis of statistic relations between circulation and precipitation, circulation typology of Niedźwiedź (1997) was applied. In the period June 1992 - May 1993, as many as 74% of annual solid precipitation was associated with the occurrence of three types of circulation (C-10, C-8 and C-3). The circulations C-4, C-6 and C-1 gave only 4% of annual precipitation. The winter season 1992/1993 is connected with typical meteorological conditions that occur in the south part of Spitsbergen. In the area of Polish Polar Station, four phases of development and degradation of snow cover were distinguished: - intensive blowing out of snow (October - January), - small increase of snow cover thickness (February - March), - considerable increase of snow cover thickness (March - May), - thaws (May, 25th - June, 28th). The thickness of snow cover depended on the altitude and local conditions. Considerable differences were determined in snow thickness at two sites located in small distance from each other (500 m), both close to the seacoast (Fig. 1). Water equivalent of the snow cover at Polish Polar Station (8 m a.s.l.) at the end of winter was only 150 mm, whereas at Fugle site (5 m a.s.l.) it was 2.5 times higher (378 mm). These values were much higher on the glaciers; Hans Glacier in the ELA zone (300 m a.s.l.) - 276 mm and in the accumulation zone (450 m a.s.l.) - 1459 mm; Amundsenisen Plateau (700 m a.s.l.) - 1293 mm.
    Źródło:
    Problemy Klimatologii Polarnej; 2001, 11; 41-54
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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