ICON in Climate Limited-area Mode (ICON release version 2.6.1): a new regional climate model
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Published:2021-02-18
Issue:2
Volume:14
Page:985-1005
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Pham Trang Van, Steger ChristianORCID, Rockel Burkhardt, Keuler KlausORCID, Kirchner IngoORCID, Mertens MarianoORCID, Rieger Daniel, Zängl Günther, Früh BarbaraORCID
Abstract
Abstract. For the first time, the Limited-Area Mode of the new ICON (Icosahedral Nonhydrostatic) weather and climate model has been used for a continuous long-term regional climate simulation over Europe.
Built upon the Limited-Area Mode of ICON (ICON-LAM), ICON-CLM (ICON in Climate Limited-area Mode, hereafter ICON-CLM, available in ICON release version 2.6.1) is an adaptation for climate applications.
A first version of ICON-CLM is now available and has already been integrated into a starter package (ICON-CLM_SP_beta1).
The starter package provides users with a technical infrastructure that facilitates long-term simulations as well as model evaluation and test routines.
ICON-CLM and ICON-CLM_SP were successfully installed and tested on two different computing systems.
Tests with different domain decompositions showed bit-identical results, and no systematic outstanding differences were found in the results with different model time steps.
ICON-CLM was also able to reproduce the large-scale atmospheric information from the global driving model.
Comparison was done between ICON-CLM and the COnsortium for Small-scale MOdeling (COSMO)-CLM (the recommended model configuration by the CLM-Community) performance.
For that, an evaluation run of ICON-CLM with ERA-Interim boundary conditions was carried out with the setup similar to the COSMO-CLM recommended optimal setup.
ICON-CLM results showed biases in the same range as those of COSMO-CLM for all evaluated surface variables.
While this COSMO-CLM simulation was carried out with the latest model version which has been developed and was carefully tuned for climate simulations on the European domain, ICON-CLM was not tuned yet.
Nevertheless, ICON-CLM showed a better performance for air temperature and its daily extremes, and slightly better performance for total cloud cover.
For precipitation and mean sea level pressure, COSMO-CLM was closer to observations than ICON-CLM.
However, as ICON-CLM is still in the early stage of development, there is still much room for improvement.
Publisher
Copernicus GmbH
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