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    Wyświetlanie 1-4 z 4
    Tytuł:
    Rekonstrukcja geometrii powierzchni lodowców z maksimum ostatniego zlodowacenia (LGM) w polskich Tatrach Wysokich (zlewnie Roztoki i Rybiego Potoku)
    Reconstruction of surface geometry of the last glacial maximum (LGM) glaciers in the Polish High Tatra Mts. (drainage basins of Roztoka and Rybi Potok)
    Autorzy:
    Makos, M.
    Nowacki, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074625.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    podcięcie lodowcowe
    ostatnie zlodowacenie (LGM)
    Polskie Tatry Wysokie
    paleogeografia lodowców
    glacial trimline
    last glacial maximum (LGM)
    Polish High Tatra Mts.
    paleoglaciology
    GIS
    Opis:
    A reconstruction of the last glacial maximum (LGM) ice surface geometry in the Polish High Tatra Mts. (drainage basins of Roztoka and Rybi Potok) is based on detailed field mapping of glacial trimlines. Obtained field data provide evidence of the ice surface elevation within the ice accumulation areas and in some cases they indicate direction of ice flow. The LGM ice-surface geometry is presented as a digital elevation model (DEM) which was created using geographic information system (GIS). Calculations of ice thickness and ice volume are based on DEM of present land topography. Reconstruction of the ice extent within ablation area is created using archival data. During LGM, the Roztoka glacier and the Rybi Potok glacier were a typical valley glaciers included into a huge glacial system being a dendritic glacier. According to acumulation area ratio (AAR) method, equilibrium line of these glaciers was situated at an elevation of about 1400 m a.s.l. It shows that nearly the whole area of the drainage basins of Roztoka and Rybi Potok have been an ice accumulation area supplying the Biała Woda glacier during LGM. Equilibrium line altitude (ELA) depression in relation to modern ELA (2300 m a.s.l.) was about 900 m. Assuming temeperature lapse rate of 0,6oC/100 m, a mean summer temperature in the Tatra Mts. was lowered of about 5,5oC. Ice area and its volume calculated for accumulation areas indicate that their relations to one another are nearly identical. It can be evidence for similar precipitation in both the Roztoka and the Rybi Potok drainage basins and an indicator of atmospheric circulation pattern which have determined climate in the Tatra Mts. during LGM.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 1; 72-79
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chronologia i zasięgi nasunięć lądolodu na obszarze lobu Wisły podczas stadiału głównego ostatniego zlodowacenia
    Chronology and extents of ice sheet advances in the Vistula lobe area during the Main Stage of the Last Glaciation
    Autorzy:
    Wysota, W.
    Molewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074848.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    loby lodowcowe Wisły
    strumień lodu Wisły
    północno-centralna Polska
    skandynawski lądolód
    ostatnie zlodowacenie (LGM)
    ostatnie zlodowacenie Wisły
    Vistula ice lobe
    Vistula ice stream
    north-central Poland
    Scandinavian Ice Sheet
    last glacial maximum (LGM)
    Late Weichselian glaciation
    Opis:
    During the maximum of the last glaciation the Vistula ice lobe was one of the key morphological elements at southern margin of the Scandinavian Ice Sheet in north-central Poland. The area of the Vistula ice lobe experienced two ice sheet advances of varied extent, the earlier one during the Leszno Phase and the younger one in the Poznań Phase. According to the authors, the limit of the Leszno Phase within the study area was much smaller than hitherto accepted and its age is estimated at about 20.5 ka BP. Significant ice sheet retreat was followed by an ice readvance during the Poznań Phase, overriding the extent of the Leszno Phase. The Poznań readvance reached the maximum limit in the Vistula ice lobe area about 18.5 ka BP. It is assumed that the rapid ice sheet transgression during the Poznań Phase (on average 400 m/a) and origin of the Vistula lobe were probably connected with activity of the palaeo-ice stream.
    Źródło:
    Przegląd Geologiczny; 2011, 59; 214-225
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Last Glacial Maximum climatic conditions in the Polish part of the High Tatra Mountains (Western Carpathians)
    Autorzy:
    Makos, M.
    Nitychoruk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059140.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Pleistocene
    last glacial maximum (LGM)
    palaeoclimate
    Opis:
    Palaeoclimatic conditions in the Polish part of the High Tatra Mountains during the Last Glacial Maximum (LGM) were reconstructed based on the former glacial topography with the use of two independent glacier-climate models. The extent of the palaeoglaciers was determined using the glacial-geomorphological record of terminal and lateral moraines as well as trimlines. Two north-faced prominent glaciers were reconstructed (Sucha Woda/Pańszczyca and Biała Woda) with their surface areas as 15.2 and 40.3 km2, respectively. The equilibrium line altitudes (ELA) of these glaciers were determined at the level of 1460 and 1480 m a.s.l. Modelled palaeoclimatic parameters show a mean summer temperature of about 0.3°C and mean annual precipitation of around 580 mm at the equilibrium line altitude of the former glaciers. This means that the summer temperature was lower by 10°C and precipitation was lower by about 60% in relation to the modern conditions. The mean annual temperature was lower by at least 12°C. On the basis of palaeoclimatic data the modern snowline altitude was established at the level of 2450-2550 m a.s.l. This indicates an ELA depression of 1000-1100 metres. Reconstructed climatic parameters at the ELA and ablation gradients indicate that both glaciers were similar to the modern glaciers in Canadian Arctic. Such climatic conditions in Central Europe indicate a cold and dry climate characteristic of the subarctic zone.
    Źródło:
    Geological Quarterly; 2011, 55, 3; 253-268
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glacial geomorphology and Pleistocene glacier reconstruction in the Demänovská Valley, Low Tatra Mountains, Slovakia
    Autorzy:
    Pyrda, Agata
    Powiązania:
    https://bibliotekanauki.pl/articles/2202855.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Low Tatra Mountains
    glacier reconstruction
    ELA (equilibrium line altitude)
    glacial cirques
    rock glaciers
    LGM (Last Glacial Maximum)
    Opis:
    In the Western Carpathians, clear evidence of the Pleistocene glaciations only occurs in two mountain massifs – the Tatra and Low Tatra Mountains. The Low Tatra Mountains (2043 m a.s.l.), contrary to the higher and more strongly glaciated Tatra Mountains (2654 m a.s.l.), have previously been much less attractive for scientific research. Hence, in these mountains both glacial landforms and chronology, together with a detailed reconstruction of glacier geometry and resulted equilibrium line altitude (ELA), are poorly documented. The aim of this paper is to characterize the glacial relief and reconstruction of geometry and ELA of the Zadná voda glacier in the Demänovská Valley system which belongs to the category of the largest Pleistocene glaciers on the northern slope of the Low Tatra Mountains. The mapping results show that a freshly shaped, massive terminal moraine of maximal ice extent (MIE, likely formed during the global Last Glacial Maximum – LGM) occurs 4.3 km distance down-valley from the glacial cirque backwalls. There is no evidence of deposits from older glaciations beyond the terminal moraine down the valley. The terminal zone of the MIE features a fresh morainic landscape with hummocky topography with kettle hollows and the only known morainic lake in the Low Tatra Mountains – Vrbické pleso. During the MIE, the Zadná voda glacier covered 7 km2 of the area and featured a mean thickness of 48 m. The ELA of this glacier was 1433 m, determined by the area-altitude balance ratio (AABR) 1.6 method, which is a similar value to the LGM ELA calculated in the Western Tatra Mountains. The recessional stages were only recognized in the cirques area, where one or two generations of debris-covered glaciers and rock glaciers mark the final deglaciation of the study area.
    Źródło:
    Geology, Geophysics and Environment; 2023, 49, 1; 19--36
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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