Blar i forfatter "Andreassen, Karin Marie"

Viser treff 1-6 av 6

    • Distinct modes of meltwater drainage and landform development beneath the last Barents Sea ice sheet 

      Shackleton, Calvin; Patton, Henry; Winsborrow, Monica; Esteves, Mariana; Bjarnadòttir, Lilja Rùn; Andreassen, Karin Marie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-18)
      The flow of glacial ice is impacted by basal meltwater drainage systems that fluctuate on a continuum from distributed, high-pressure environments to channelized, lower pressure networks. Understanding the long-term development of dominant drainage modes and impacts on ice flow and landform development is a crucial step in predicting palaeo and contemporary ice-mass response to changes in ...

    • The extreme yet transient nature of glacial erosion 

      Patton, Henry; Hubbard, Alun; Heyman, J.; Alexandropoulou, Nikolitsa; Lasabuda, Amando P. E.; Stroeven, A.P.; Hall, A.M.; Winsborrow, Monica; Sugden, David E.; Kleman, J.; Andreassen, Karin Marie (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-30)
      Ice can sculpt extraordinary landscapes, yet the efficacy of, and controls governing, glacial erosion on geological timescales remain poorly understood and contended, particularly across Polar continental shields. Here, we assimilate geophysical data with modelling of the Eurasian Ice Sheet — the third largest Quaternary ice mass that spanned 49°N to 82°N — to decipher its erosional footprint during ...

    • Hydrocarbon leakage driven by quaternary glaciations in the Barents Sea based on 2D basin and petroleum system modeling 

      Kishankov, Aleksei; Serov, Pavel; Bünz, Stefan; Patton, Henry Jared; Hubbard, Alun Lloyd; Mattingsdal, Rune; Vadakkepuliyambatta, Sunil; Andreassen, Karin Marie (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-25)
      The Barents Sea has experienced intense erosion throughout the Cenozoic due to uplift and repeated episodes of glaciation. This, in turn, has driven large pressure and temperature fluctuations in the sediment substrate along with rearrangement of thermogenic oil and gas accumulations. As a result, some hydrocarbon fields have relatively shallow depths, and natural gas release is widespread. This ...

    • The role of ocean and atmospheric dynamics in the marine-based collapse of the last Eurasian Ice Sheet 

      Sejrup, Hans Petter; Hjelstuen, Berit Oline Blihovde; Patton, Henry; Esteves, Mariana; Winsborrow, Monica; Rasmussen, Tine Lander; Andreassen, Karin Marie; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-19)
      Information from former ice sheets may provide important context for understanding the response of today’s ice sheets to forcing mechanisms. Here we present a reconstruction of the last deglaciation of marine sectors of the Eurasian Ice Sheet, emphasising how the retreat of the Norwegian Channel and the Barents Sea ice streams led to separation of the British-Irish and Fennoscandian ice sheets at ...

    • A time-transgressive perspective of glacial erosion and meltwater beneath the Eurasian ice sheet 

      Patton, Henry Jared; Hubbard, Alun Lloyd; Heyman, Jakob; Alexandropoulou, Nikolitsa; Lasabuda, Amando P. E.; Stroeven, Arjen P; Hall, Adrian; Winsborrow, Monica Caroline Mackay; Sugden, David A.; Kleman, Johan; Shackleton, Calvin; Da Silveira Ramos Esteves, Mariana; Bjarnadóttir, Lilja Rún; Andreassen, Karin Marie (Conference object; Konferansebidrag, 2023-08)
      The efficacy and controls governing glacial erosion over geological timescales are intricately linked yet remain poorly understood and contended. By assimilating geophysical data with modelling of the Eurasian Ice Sheet - the third largest Quaternary ice mass that spanned 49°N - 82°N - we decipher its erosional footprint during the last ~110 ka glacial cycle. Our results demonstrate extreme ...

    • Widespread natural methane and oil leakage from sub-marine Arctic reservoirs 

      Serov, Pavel; Mattingsdal, Rune; Winsborrow, Monica; Patton, Henry; Andreassen, Karin Marie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-30)
      Parceling the anthropogenic and natural (geological) sources of fossil methane in the atmosphere remains problematic due to a lack of distinctive chemical markers for their discrimination. In this light, understanding the distribution and contribution of potential geological methane sources is important. Here we present empirical observations of hitherto undocumented, widespread and extensive methane ...