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Introduction
The Copernicus Arctic Regional Reanalysis (CARRA) is a high resolution (2.5 km) reanalysis system for two domains of the European part of the Arctic (Figure 1). The CARRA dataset covers the period from September, 1990 and onward (timely updates are planned to be provided until June 2025). CARRA adds value to the ERA5 global reanalysis with the use of more (local) observations, with the focus on the representation of important local processes like cold surfaces and with its higher spatial horizontal resolution which allows for more details. The CARRA system is described in its Full System Documentation, while some key points of the configuration of the system is compared to ERA5 in Table 1.
The main findings of a comprehensive evaluation of the CARRA dataset are presented in this page. However, the CARRA dataset is huge, and a fully exhaustive examination of all parts of the data is simply not possible. The data users are therefore also encouraged to perform their own evaluation, tailored towards their own use of the data and also to seek information in the literature. A selection of studies, which includes evaluation and comparisons of different parts of the CARRA data set can be found here.
Period | Output frequency | grid spacing | Data assimilation | Observations | Model system | Miscellaneous | |
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| CARRA | 1991 -> | 3-hourly analysis, hourly forecasts | 2,5 km, 65 vertical levels | 3D-Var and optimal interpolation at surface | satellite + conventional (additional local in-situ observations) | HARMONIE-AROME Cy40h1.1 | Apply ERA5 at lateral boundaries. Focus on the representation of cold surfaces, and build on experience gained from operational forecasts for the same regions at DMI and MET Norway. |
| ERA5 | 1950 -> | hourly analysis, hourly forecasts | ~31 km, 137 vertical levels | 4D-Var and optimal interpolation/Ensemble Kalman Filter at surface | satellite + conventional | IFS Cy41r2 | Build on the experience gained from operational forecasts at ECMWF and previous generations of reanalyses. |
Table 1. Some key features of CARRA compared to ERA5.
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Known issues for the Copernicus Arctic Regional reanalysis. Copernicus Knowledge Base (CKB) article. Copernicus Arctic Regional Reanalysis (CARRA): known issues and uncertainty information#Knownissues
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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