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    Wyświetlanie 1-3 z 3
    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:
    Glacial Terminations II and I as recorded in NE Iceland
    Autorzy:
    Vliet-Lanoë, Brigitte
    Guðmundsson, Agust
    Guillou, Hervé
    Guégan, Soléne
    Loon, A. J. (Tom)
    Vleeschouwer, François
    Powiązania:
    https://bibliotekanauki.pl/articles/94567.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    ice-stream patterns
    palaeolake
    deglaciation
    Last Glacial Maximum
    mid-Eemian cooling
    Iceland
    paleojezioro
    deglacjacja
    ostatnie zlodowacenie
    Islandia
    Opis:
    Volcanism in eastern Iceland has controlled the changes in glacier- and river-drainage patterns and the sedimentary budget, particularly during the Middle and Late Pleistocene. The glacial extent in NE Iceland appears to be related to the impact of volcanic activity, not only on the ice-stream dynamics, but also on the sedimentary successions. Analysis of the Jökuldalur and Jökulsa á Brù records results in a new interpretation of the changes in ice extent and flow direction for at least the last two glaciations. From MIS 8 onward, the development of the Snæfell volcano apparently forced the ice stream that derived from the Vatnajökull ice cap to take another course; it also affected the offshore sedimentary budgets at the new outlet at Vopnafjördur. The MIS 6 ice sheet was thick and extensive, and associated with an ice-stream diversion to the North. The thick sedimentary complex of palaeolake Halslón was formed close to an outlet of the Vatnajökull, the Brùarjökull, during Termination II and a part of the MIS 5e interglacial. The deposits formed during MIS 5e record two climate optima interrupted by two successive glacial advances correlated with the mid-Eemian cooling. The deposits of the Weichselian deglaciation (Termination I) are much more limited in thickness. During the Last Glacial Maximum and the Late Glacial, glaciers also seem to have been restricted in the Jökulsa á Brù area. Valley glaciers issued from the Brùarjökull re-advanced several times in the Jökuldalur only during at least the Older Dryas, the Younger Dryas and the Preboreal. NE Iceland has undergone considerable deglaciation since the Bølling. In contrast to the conclusions of previous studies, the results presented here are consistent with data on the glaciations in other Nordic regions and can increase the understanding of the mid-Eemian cooling.
    Źródło:
    Geologos; 2010, 16, 4; 201-222
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-3 z 3

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