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ICON in Climate Limited-area Mode (ICON release version 2.6.1): a new regional climate model

Van Pham, Trang and Steger, Christian and Rockel, Burkhardt and Keuler, Klaus and Kirchner, Ingo and Mertens, Mariano and Rieger, Daniel and Zängl, Günther and Früh, Barbara (2021) ICON in Climate Limited-area Mode (ICON release version 2.6.1): a new regional climate model. Geoscientific Model Development (14), pp. 985-1014. Copernicus Publications. doi: 10.5194/gmd-14-985-2021. ISSN 1991-959X.

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Official URL: https://gmd.copernicus.org/articles/14/985/2021/


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.

Item URL in elib:https://elib.dlr.de/141055/
Document Type:Article
Title:ICON in Climate Limited-area Mode (ICON release version 2.6.1): a new regional climate model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Van Pham, TrangDWD, OffenbachUNSPECIFIED
Steger, ChristianDWD, OffenbachUNSPECIFIED
Rockel, BurkhardtHelmholtz-Zentrum Geesthacht, Geesthacht, GermanyUNSPECIFIED
Keuler, KlausBrandenburg University of Technology, CottbusUNSPECIFIED
Kirchner, IngoFreie Universität Berlin, BerlinUNSPECIFIED
Mertens, MarianoDLR, IPAhttps://orcid.org/0000-0003-3549-6889
Rieger, DanielDWD, OffenbachUNSPECIFIED
Zängl, GüntherDWD, OffenbachUNSPECIFIED
Früh, BarbaraDWD, OffenbachUNSPECIFIED
Date:18 February 2021
Journal or Publication Title:Geoscientific Model Development
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 985-1014
Publisher:Copernicus Publications
Keywords:Klima, Klimamodellierung, Regionale Modellierung, ICON
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Mertens, Mariano
Deposited On:22 Feb 2021 07:38
Last Modified:22 Feb 2021 07:38

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