Olli Karjalainen

Olli Karjalainen


Postdoctoral researcher

6 peer reviewed publications in international journals. The publications have been cited 122 times, of which the most cited publication accounts for 75 citations. The author has a h-index of 4.00. (Scopus)


I am a physical geographer currently studying periglacial and permafrost landscapes at both local and global scales. More specifically, I am interested in (perma)frost related processes and landforms and their dynamics in a changing climate. In my work, I make use of a wide array of GIS and statistical modelling methods, for example. In addition, I am involved in efforts to assess the effects of climate change on permafrost and infrastructure across the Arctic region.

Research interests

  • Permafrost and periglacial processes
  • Geomorphology
  • Global change
  • Geohazards


ArcticSHOC: Spatial ensemble prediction of permafrost thaw, soil carbon and ground-ice in the Arctic

INFRAHAZARD: Geomorphic sensitivity of the Arctic region: geohazards and infrastructure (2015-2018)

Social media

Professional and community activities

  • Geographical Society of Northern Finland
  • https://nordia.journal.fi/
  • Steering Committee Member, T-MOSAiC Arctic Infrastructure Action Group
  • https://www.t-mosaic.com/infrastructure.html
  • Young National Correspondent for Finland in GTN-P (Global Terrestrial Network for Permafrost)
  • National Representative for Finland in PYRN (Permafrost Young Researchers Network)

Research groups

  • Physical Geography Research Group (PGRG)

Selected publications

  • Karjalainen, Olli; Luoto, Miska; Aalto, Juha; Etzelmüller, Bernd; Grosse, Guido; Jones, Benjamin M; Lilleøren, Karianne S; Hjort, Jan (2020) High potential for loss of permafrost landforms in a changing climate. - Environmental research letters 15 (10), 104065 . [Original]
  • Karjalainen, Olli; Luoto, Miska; Aalto, Juha; Hjort, Jan (2019) New insights into the environmental factors controlling the ground thermal regime across the Northern Hemisphere: a comparison between permafrost and non-permafrost areas. - Cryosphere 13 (2), 693-707 . [Original] [Self-archived]
  • Karjalainen, Olli; Aalto, Juha; Luoto, Miska; Westermann, Sebastian; Romanovsky, Vladimir E.; Nelson, Frederick E.; Etzelmüller, Bernd; Hjort, Jan (2019) Circumpolar permafrost maps and geohazard indices for near-future infrastructure risk assessments. - Scientific data 6, 190037 . [Original]
  • Hjort, Jan; Karjalainen, Olli; Aalto, Juha; Westermann, Sebastian; Romanovsky, Vladimir E.; Nelson, Frederick E.; Etzelmüller, Bernd; Luoto, Miska (2018) Degrading permafrost puts Arctic infrastructure at risk by mid-century. - Nature Communications 9, 5147 . [Original] [Self-archived]
  • Aalto, J.; Karjalainen, O.; Hjort, J.; Luoto, M. (2018) Statistical Forecasting of Current and Future Circum-Arctic Ground Temperatures and Active Layer Thickness. - Geophysical Research Letters 45 (10), 4889-4898 . [Original]

Research visits

  • University of Oslo/Department of Geosciences
    3.5.2018 to 15.6.2018