Disputation: Trygve Kvåle Løken

Doctoral candidate Trygve Kvåle Løken at the Department of Mathematics, Faculty of Mathematics and Natural Sciences, is  defending the thesis Experiments and new observation techniques related to wave-ice interactions for the degree of Philosophiae Doctor.

Picture of the candidate.

Doctoral candidate Trygve Kvåle Løken

The PhD defence and trial lecture will be digital and streamed directly using Zoom. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask questions ex auditorio at the end of the defence. If you would like to ask a question, click 'Raise hand' and wait to be unmuted.

Join the disputation

The webinar opens for participation just before the disputation starts, participants who join early will be put in a waiting room.

Trial lecture

"Icing and ship stability"

Prerecorded trial lecture 

(Will be published 22.09.2021)

Main research findings

The polar oceans consist of open water, continuous ice covers and zones of broken ice floes of various sizes in the transition between water and ice. As the waves from the open ocean travel into the zone of ice floes, the wave height is efficiently damped. In this work, I have investigated mechanisms of energy dissipation that occur when waves are propagating through sea ice. It is important to gain knowledge about these processes because we may use this information to better predict the short term sea state and wave height and the long term climate in the polar regions. Reliable wave forecast models in the vicinity of sea ice are necessary to ensure safe human activities in the polar oceans.

It is challenging to perform fieldwork on the sea ice due to the harsh conditions and the remoteness of the polar areas. Consequently, relatively few field studies on waves in ice are available. Therefore, my research group have developed new measurement techniques for direct observations of wave attenuation through sea ice. We have used these methods to show that a large portion of the wave energy is transformed into ocean turbulence in the interaction with sea ice.

Candidate contact information


Adjudication committee

  • Professor Jim M. Thomson, University of Washington
  • Professor Takuji Waseda, University of Tokyo
  • Associate professor Irina Didenkulova, University of Oslo


  • Professor Atle Jensen, University of Oslo
  • Senior Engineer Jean Rabault, Norwegian Meteorological Institute
  • Professor Aleksey Marchenko, University Centre Svalbard

Chair of defence

Host of the session


Published Sep. 10, 2021 1:13 PM - Last modified Sep. 14, 2021 3:35 PM