EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

24 years of C3S Arctic regional reanalysis

Kristian Pagh Nielsen1, Harald Schyberg2, Xiaohua Yang1, Eivind Støylen2, Per Dahlgren2, Bjarne Amstrup1, Carlos Peralta1, Morten Køltzow2, and Jelena Bojarova3
Kristian Pagh Nielsen et al.
  • 1Danish Meteorological Institute, Copenhagen Ø, Denmark (
  • 2Met Norway, Oslo, Norway
  • 3Swedish Meteorological and Hydrological Institute, Norrköping, Sweden

The Copernicus Climate Change Service (C3S) regional reanalysis for the Arctic consists of two datasets of Essential Climate Variables (ECVs) for the 24 year period from 1997 to 2021. The high resolution (2.5x2.5 km2) datasets cover Greenland, Iceland, Svalbard, the Barents Sea and Northern Scandinavia. Several islands in the Russian Arctic and a few islands in the Canadian Arctic are also covered. The produced datasets are freely available to all. A first subset of the data has been published on the Copernicus Data Store (CDS) in early 2021.

The reanalysis is perfomed with state-of-the-art data assimilation techniques that include many local quality-controlled observations that have not been included in previously published reanalysis datasets. The weather forecasting model HARMONIE-AROME cy40h1.1.1 has been used to produce the dataset. The model computations have additionally been optimized for processes essential in the Arctic. Estimated uncertainty data have been produced at atmospheric pressure levels, and validation statistics have been made for synoptic weather stations.

How to cite: Nielsen, K. P., Schyberg, H., Yang, X., Støylen, E., Dahlgren, P., Amstrup, B., Peralta, C., Køltzow, M., and Bojarova, J.: 24 years of C3S Arctic regional reanalysis, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15178,, 2021.


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