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\begin{document}

\title{The Fifth Generation Regional Climate Modeling System, RegCM5: the first
CP European wide simulation and validation over the CORDEX-CORE domains.}



\author[1]{Erika Coppola}%
\author[2]{Filippo Giorgi}%
\author[3]{Graziano Giuliani}%
\author[4]{Emanuela Pichelli}%
\author[5]{James M Ciarlo`}%
\author[6]{Francesca Raffaele}%
\author[5]{Rita Nogherotto}%
\author[7]{Michelle Simões Reboita}%
\author[5]{Chen Lu}%
\author[8]{Natalia Zazulie}%
\author[5]{Luiza Vargas-Heinz}%
\author[9]{Andressa Andrade Cardoso}%
\author[10]{Johannes de Leeuw}%
\affil[1]{Abdus Salam ICTP}%
\affil[2]{The Abdus Salam International Centre for Theoretical Physics}%
\affil[3]{ICTP}%
\affil[4]{Abdus Salam International Center for Theoretical Physics}%
\affil[5]{Abdus Salam International Centre for Theoretical Physics}%
\affil[6]{The Abdus Salam International Centre for Theoretical Physics - ICTP}%
\affil[7]{Universidade Federal de Itajubá}%
\affil[8]{Universidad de Buenos Aires}%
\affil[9]{Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo}%
\affil[10]{National Institute of Oceanography and Applied Geophysics}%


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  \date{May 18, 2024}


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\begin{abstract}
The Regional Climate Modeling system (RegCM) has undergone a significant
evolution over the years, leading for example to the widely used
versions RegCM4 and RegCM4-NH. In response to the demand for higher
resolution, a new version of the system has been developed, RegCM5,
incorporating the non-hydrostatic dynamical core of the MOLOCH weather
prediction model. In this paper we assess the RegCM5's performance for 5
CORDEX-CORE domains, including a pan-European domain at
convection-permitting resolution.\\
We find temperature biases generally in the range of -2 to 2 degrees
Celsius, higher in the northernmost regions of North America and Asia
during winter, linked to cloud water overestimation. Central Asia and
the Tibetan Plateau show cold biases, possibly due to sparse station
coverage. The model exhibits a prevailing cold bias in maximum
temperature and warm bias in minimum temperature, associated with a
systematic overestimation of lower-level cloud fraction, especially in
winter.\\
Taylor diagrams indicate a high spatial temperature pattern correlation
with ERA5 and CRU data, except in South America and the Caribbean
region. The precipitation evaluation shows an overestimation in South
America, East Asia, and Africa. RegCM5 improves the daily precipitation
distribution compared to RegCM4, particularly at high intensities. The
analysis of wind fields confirms the model's ability to simulate monsoon
circulations. The assessment of tropical cyclone tracks highlights a
strong sensitivity to the tracking algorithms, thus necessitating a
careful model interpretation.\\
Over the European region, the convection permitting simulations
especially improve the diurnal cycle of precipitation and the hourly
precipitation intensities.%
\end{abstract}%



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\textbf{Hosted file}

\verb`983024_0_art_file_11721499_s643zt.docx`  available at \url{https://authorea.com/users/713227/articles/697591-the-fifth-generation-regional-climate-modeling-system-regcm5-the-first-cp-european-wide-simulation-and-validation-over-the-cordex-core-domains}

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