Disputas - Master of science Sofia Elisabeth Kjellman

Disputas - Sofia Elisabeth Kjellman

Master of science Sofia Elisabeth Kjellman will on September 23rd at 14.15 publically defend her PhD degree in science.

Title of the PhD thesis:

"Holocene precipitation seasonality on Svalbard and in Northern Fennoscandia reconstructed using organic geochemical and stable isotope proxies"


As the Arctic warms, it gets wetter. Exactly why, and by how much is difficult to predict due to lack of long-term observations and complex interactions between the atmosphere, cryosphere, and the ocean. Stable isotopes of hydrogen (d2H) in precipitation are sensitive to moisture source changes and atmospheric temperature and therefore provide information about various water cycle processes. Lakes are excellent climate archives as their sediments hold information about past environmental conditions. When plants produce leaf waxes (fats protecting their leaves) they incorporate d2H of the source (lake or soil) water, indirectly reflecting precipitation d2H. In this thesis, leaf wax d2H from lake sediments and modern lake water d2H are used to study water cycle changes on Svalbard and in northern Fennoscandia. Our results suggest that both past and present seasonal precipitation patterns in these regions are highly impacted by North Atlantic sea surface and atmospheric conditions.

The thesis is published and available in Munin


  • Professor Anders Schomacker, institutt for geovitenskap UiT (hovedveileder)
  • Førsteamanuensis Lena Håkansson, UNIS
  • Associate professor Elizabeth Thomas, Department of Geology, University of Buffalo, NY, USA

Evaluation committee

•       Associate professor Melissa A. Berke, Dept. of Biological Sciences, University of Notre Dame USA. (1. opponent)
•       Professor Jostein Bakke, Institutt for geovitenskap, Universitetet i Bergen (2. opponent)
•       Professor Tine L. Rasmussen, Institutt for geovitenskap, UiT Norges arktiske universitet (internt medlem og leder av bedømmelseskomiteen)

Leader of the defense: Dekan Arne Smalås, Fakultet for naturvitenskap og teknologi, UiT

Links to the trial lecture and defense will be possible to open when the live stream begins. If you haven`t clicked the link to the folder before it begins, refresh the web browser for them to become visible. If you have clicked the link to the trial lecture or defense before it has started, it will open automatically when the stream begins. 

Link to folder which contains trial lecture and defense

The trial lecture starts at 12.15 September 23rd.

Trial lecture

The Defense starts at 14.15 September 23rd.


When: 23. September 2022 at 14.15–18.00
Where: Teknobygget auditorium 1.022
Location / Campus: Digital, Tromsø
Target group: Employees, Students, Guests, Invited
Contact: Eirik Derås Verlo
E-mail: eve012@uit.no
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