The ensemble Kalman filter (EnKF) and its versatile variants are renowned for their remarkable data assimilation capabilities in diverse domains such as atmospheric, oceanic, hydrologic, biomedical, biologic, and petroleum reservoir systems. By providing a platform for thought-provoking presentations and meaningful discussions, the EnKF workshop seeks to foster collaboration among technical experts, practitioners, researchers, and students. Together, we will showcase cutting-edge research findings, exchange practical insights, and collectively explore uncharted territories by identifying crucial challenges. Join us to deepen your knowledge, expand your network, and contribute to the advancement of data assimilation.


  • Ullensvang Hotel, Ullensvang, Norway.
  • June 16 - 19, 2025.
  • The local climatology
  • Physical attendance only (no virtual participation or videoconferencing).
  • There are excellent hiking opportunities in the area, and the program includes a guided hike, possibly including vistas of the Folgefonna glacier.
  • The hotel includes pools with spa facilities, with access to the fjord for more daring swimmers.
Outdoor (heated) pool. Also connected to an indoor pool Cider farms Transport to the venue
Images from venue


The day-long hike to scenic Trolltunga (pictured here) is about 1 hour’s drive away from the hotel. The path is very well trodden in tourist season. The workshop host will not be able to assist with organisation of any trek to Trolltunga, but wish to note that

  • Parking at the starting point for the trek must be booked (preferably weeks) in advance.
  • Public transport (stage-1, stage-2) is also possible.


NB: the program is provisional, and subject to changes!

  • Participants must arrange their own travel to/from Bergen to fit around the program. Inbound flights will necessarily be June 15 or earlier, but the program allows for return flights departing on June 19 after 16:00.
  • A chartered ferry will take us from downtown Bergen to Ullensvang.
  • The WS-in-WS will be a communal effort to advance DA research and applicability.


  • Posters are on display throughout the workshop, and should be presented during both poster sessions. Size: max A0, preferably upright (portrait).
  • Talks should have a run time of 22 min, to be followed by 8 min. Q&A.

Invited speakers


Abstracts and registration

  • Deadline: March 7, CET 18:00.
  • But non-presenting attendees can sign up until May 10 by selecting None (in place of Poster or Talk) in the form below. Admission is subject to availability, and the fee will be the same as for presenters.
  • Participants selected for admission by the scientific committee will receive a link to pay the conference fee and thereby confirm their registration. The fee covers the meals and hotel room for 3 nights (ref. schedule), and is estimated at NOK 16,000 (around 1,500€).
  • To submit both a poster and a talk please fill in the form twice.
  • This conference does not publish papers or proceedings.
  • It is possible to bring a companion or children. Please specify this in the “additional information” field of the form. The price will be published later, and will need to be settled directly with the hotel.

The submission form will be made available later this year.

Scientific committee

  • NORCE: Geir Evensen, Dean Oliver, Patrick N. Raanes
  • NERSC: Laurent Bertino
  • Equinor: Remus Hanea


The EnKF is a data assimilation method that was co-invented and has been continuously developed by researchers at NORCE and NERSC. Over the last three decades, the EnKF and related ensemble methods, has emerged as a highly effective and widely adopted approach for data assimilation in large-scale models, and have made profound impacts on the advancements of various disciplines and promoted value creations for relevant industries.


While the fundamental concept of ensemble methods is simple, practical implementations often demand problem-specific modifications for success. Our workshop aims to bridge the expertise of specialists from various fields to investigate the foundations and interconnections of EnKF-related methods that have demonstrated effectiveness in diverse environments. In so doing, we strive to enhance the robustness and efficiency in applications. Beyond practical applications, this gathering also facilitates the exchange of innovative research ideas, methods, algorithms, and workflows with the potential to further enhance the performance of EnKF and related approaches.


In 2006, the inaugural EnKF workshop was held in Voss, Norway, marking the beginning of an annual tradition. Throughout the years, the EnKF workshop has consistently attracted participants from a wide range of scientific disciplines. The cross-pollination of ideas and the exchange of scientific advancements have fostered vibrant discussions and elevated the workshop’s scientific calibre to a high level. As a result, the annual international EnKF workshop has now established itself as a paramount event within the data assimilation community.

Full listing of previous workshops



Please contact if you want to sponsor the workshop.