A 30-year Copernicus Arctic Regional Reanalysis (CARRA) for the period of 1991-2021 has recently been finalized within the framework of the Copernicus Climate Change Service (C3S), which is a service implemented by ECMWF on behalf of the European Commission. The reanalysis is performed on European Arctic regions covering Greenland, Iceland, Barents Sea, Svalbard and Northern Scandinavia, with a 2.5 km grid resolution reanalysis based on the HARMONIE-AROME NWP system. A near-real time extension service of the reanalysis, CARRA-Timely Updates is now being set up with a targeted monthly update with a 2-month delay. In addition, plans are under discussion to set up a system for the next generation of a CARRA reanalysis which will cover the whole pan-Arctic region with similar resolution for a somewhat further extended reanalysis time period. These efforts are led by MET Norway with the other Nordic and the French national meteorological services as partners. Due to the Arctic climate warming being on average faster than the rest of the globe, there is enhanced user focus on change processes in this area. Through the Copernicus Climate Data Store (CDS), the CARRA dataset is now available for the climate research community. In this presentation we will focus on how the data set verifies and compares to other data sets. We demonstrate how the Arctic reanalysis adds value versus the global reanalysis ERA5 both statistically and for special weather events. This value addition is obtained both by using a higher-resolution model and by using fine-scale regional input data not used in the global system.
How to cite: Schyberg, H., Yang, X., Støylen, E., Dahlgren, P., S. Madsen, M., Køltzow, M., and Olesen, M.: Evolution of the Copernicus Arctic Regional Reanalysis, EMS Annual Meeting 2022, Bonn, Germany, 5–9 Sep 2022, EMS2022-535, https://doi.org/10.5194/ems2022-535, 2022.
