• Biotransformation of chemically dispersed diesel at sub-zero temperatures using artificial brines 

      Dang, Nga Phuong; Petrich, Chris; O'Sadnick, Megan; Toske, Lisa (Journal article; Tidsskriftartikkel, 2020-01-01)
      The biotransformation of hydrocarbon compounds in seawater at sub-zero temperature has gained research interest in recent years with the most focus placed on temperatures around 0°C. In this study, biotransformation of dispersed diesel at sub-zero temperatures (−2°C to −6°C) in artificial brines, prepared by adding Instant Ocean salt to natural seawater to increase salinity, is examined. The oil was ...
    • From above and standing atop- two views of Norwegian fjord ice 

      O'Sadnick, Megan; Petrich, Chris; Brekke, Camilla; Skardhamar, Jofrid (Conference object; Konferansebidrag, 2020-10)
      In O’Sadnick et al. (2020), estimations of ice extent along the coast of Norway since 2001 determined from MODIS imagery are presented. From our findings, it is evident that the amount of ice in one fjord over time often varies and shows little consistency leading to the next question of ‘Why’? The study continues to relate freezing degree days, rainfall plus snowmelt, and snowfall to values of ...
    • Ice conditions in northern Norwegian fjords: Observations and measurements from three winter seasons, 2017–2020 

      O'Sadnick, Megan; Petrich, Chris; Brekke, Camilla; Skardhamar, Jofrid; Kleven, Øystein (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-31)
      Freshwater provided by rivers beginning deep within the mountains, feeds into fjords along the coast of Norway, often forming a brackish surface layer that will change in its salinity, thickness, and extent throughout the year. As temperature drops below freezing, ice can form from this layer along the entire coastline from 71◦ N down to 58◦ N. The influence of freshwater combined with changing ...
    • Ice extent in sub-arctic fjords and coastal areas from 2001 to 2019 analyzed from MODIS imagery 

      O'Sadnick, Megan; Petrich, Christian; Brekke, Camilla; Skarðhamar, Jofrid (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-03)
      Results examining variations in the ice extent along the Norwegian coastline based on the analysis of Moderate Resolution Imaging Spectroradiometer (MODIS) images from 2001 to 2019, February through May, are presented. A total of 386 fjords and coastal areas were outlined and grouped into ten regions to assess seasonal and long-term trends in ice extent. In addition, three fjords were examined to ...
    • Ice in Norwegian subarctic fjords and coastal regions: An examination of ice formation, properties, and trends based on remote sensing and in situ data 

      O'Sadnick, Megan (Doctoral thesis; Doktorgradsavhandling, 2022-09-16)
      Larger fjords along the Norwegian coast are ice free all year due to the influence of warm Atlantic water, however, sea ice can form in the inner parts of fjords and in smaller fjord branches. While a wide breadth of work exists examining mainland Norwegian fjords often focused on water mass dynamics and their link to biological processes, little research has been conducted on specifically sea ice ...
    • Static ice loads on a dam in a small Norwegian reservoir 

      Petrich, Chris; Sæther, Irina Vasiljeva; O'Sadnick, Megan; Arntsen, Bård (Conference object; Konferansebidrag, 2020-11)
      Ice loads on a concrete dam have been calculated from stress measurements in Taraldsvikfossen Reservoir, a small reservoir in Narvik, Norway, during three winter seasons. Ice thickness was in the range of 0.5 to 1.0 m, and both thermal ice loads were observed and water level fluctuations up to 30 cm were observed when the ice cover froze to the spillway. The maximum global line load measured was 60 ...
    • Tracking changes in the fjord environment over a winter season using ice bulk salinity and δ18O 

      O'Sadnick, Megan; Petrich, Chris; Skardhamar, Jofrid (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-11)
      Ice that forms in the fjords of northern Norway often undergoes temperature fluctuations, rising above and below freezing, throughout winter and experiences variable conditions at the ice-ocean interface due to changes in freshwater runoff from surrounding land. Conditions at the interface can be difficult to track throughout the season without consistent measurement, resultantly limiting ...