Dr Joakim Kjellsson

Research Division 1: Ocean Circulation & Climate Dynamics
ME Marine Meteorology

Raum: DW-417
Telefon: +49 431 600-4057
E-Mail: jkjellsson(at)geomar.de

Adresse: Düsternbrooker Weg 20 D-24105 Kiel

Research interests

  • Climate change adaptation (Northern European Enclosure Dam)
  • Extreme weather events
  • Air-sea interactions 
  • Kinetic energy budgets in ocean models and the impact of horizontal resolution
  • Tracing air- and water masses using Lagrangian trajectories

The Northern European Enclosure Dam (NEED) is a conceptual idea for protecting Northern Europe from future sea-level rise. While it might be economically and technologically feasible to do, and even attractive compared to some other options (e.g. migration), it serves more as a warning of the threat posed by sea-level rise. 


Computer simulations of the North Sea tides and ocean currents shows three things:

1) With NEED, the sea-levels would rise in the North Sea due to large water input from rivers. The excess water must therefore be pumped out. 

2) The North Sea would gradually become less salty as the only source of water would be rivers and rain, which is fresh water. The North Sea water would likely become more like the Baltic Sea water. 

3) There would be almost no tides in the North Sea. Tidal waves from the Atlantic Ocean would be deflected towards Norway instead. See animation here: https://www.youtube.com/watch?v=WHUj2StdG68


  • 2005-2009: Undergraduate studies in Meteorology at Stockholm University
  • 2009-2014: PhD studies in Atmospheric Sciences & Oceanography at Stockholm University
  • 2014-2016: Postdoc at British Antarctic Survey, Cambridge, UK
  • 2016-2017: Postdoc at Atmospheric, Oceanic and Planetary Physics, University of Oxford, UK
  • 2017-2019: Postdoc at GEOMAR
  • 2019- : W1 Junior Professor in Meteorology 


  • Introduction to Meteorology (lectures)
  • Measurement Methods in Meteorology (lectures + practical training)
  • Data analysis & statistics (tutorials)