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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 01 Nov 2018

Development and technical paper | 01 Nov 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

CORDEX-WRF v1.3: Development of a module for theWeather Research and Forecasting (WRF) model to support the CORDEX community

Lluís Fita1, Jan Polcher2, Theodore M. Giannaros3, Torge Lorenz4, Josipa Milovac5, Giannis Sofiadis6, Eleni Katragkou6, and Sophie Bastin7 Lluís Fita et al.
  • 1Centro de Investigaciones del Mar y la Atmósfera (CIMA), CONICET-UBA, CNRS UMI-IFAECI, C. A. Buenos Aires, Argentina
  • 2Laboratoire de Météorologie Dynamique (LMD), IPSL, CNRS, École Polytechnique, Palaisseau, France
  • 3National Observatory of Athens (NOA) - Institute for Environmental Research and Sustainable Development (IERSD), Penteli, Greece
  • 4Uni Research Climate, Bjerknes Centre for Climate Research, Bergen, Norway
  • 5Institute of Physics and Meteorology, University of Hohenheim, Stuttgart, Germany
  • 6Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece
  • 7Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS)/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France

Abstract. The Coordinated Regional Climate Downscaling Experiment (CORDEX) is a scientific effort of the World Climate Research Program (WRCP) for the coordination of regional climate initiatives. In order to accept an experiment, CORDEX provides experiment guidelines, specifications of regional domains and data access/archiving. CORDEX experiments are important to study climate at the regional scale, and at the same time, they also have a very prominent goal in providing regional climate data of high quality. Data requirements are intended to cover all the possible needs of stake holders, and scientists working on climate change mitigation and adaptation policies in various scientific communities. The required data and diagnostics are grouped into different levels of frequency, priority, and some of them even have to be provided as statistics (minimum, maximum, mean) over different time periods. Most commonly, scientists need to post-process the raw output of regional climate models, since the latter was not originally designed to meet the specific CORDEX data requirements. This post-processing procedure includes the computation of diagnostics, statistics, and final homogenization of the data, which is often computationally costly and time consuming. Therefore, the development of specialized software and/or code is required. The current paper presents the development of a specialized module (version 1.3) for the Weather Research and Forecasting (WRF) model, capable of outputting the required CORDEX variables. Additional diagnostic variables not required by CORDEX, but of potential interest to the regional climate modeling community, are also included in the module. Generic definitions of variables are adopted in order to overcome model and/or physics parameterization dependence of certain diagnostics and variables, thus facilitating a robust comparison among simulations. The module is computationally optimized, and the output is divided in different priority levels following CORDEX specifications (Core, Tier1, and additional) by selecting pre-compilation flags. This implementation of the module does not add a significant extra cost when running the model, for example the addition of the Core variables slows the model time-step by less than a 5%. The use of the module reduces the requirements of disk storage by about a 50%.

Lluís Fita et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Lluís Fita et al.
Model code and software

WRF-CORDEX module version 1.3 for WRFV3.7.1 L. Fita

WRF-CORDEX module version 1.3 for WRFV3.8.1 L. Fita

WRF-CORDEX module version 1.3 for WRFV3.9.1.1 L. Fita

WRF-CORDEX module version 1.3 for WRFV4.0 L. Fita

Lluís Fita et al.
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Publications Copernicus
Short summary
Regional climate experiments coordinated throughout CORDEX aim to study and provide high quality climate data over a given region. This data is used by climate change mitigation and adaptation policies studies and stake holders. CORDEX requires a list of variables, which most of them are not provided by atmospheric models. Aiming to help the community and to maximize use of CORDEX exercises, we create a new module for the WRF model to directly produce them adding generic and additional ones.
Regional climate experiments coordinated throughout CORDEX aim to study and provide high quality...