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A Climatological Study of Western Mediterranean Medicanes in Numerical Simulations with Explicit and Parameterized Convection
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Atmosphere 2018, 9(11), 436; https://doi.org/10.3390/atmos9110436

Sensitivity of a Mediterranean Tropical-Like Cyclone to Physical Parameterizations

1
Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
Institute of Atmospheric Sciences and Climate-National Research Council (ISAC-CNR), 73100 Lecce, Italy
3
Laboratory of Climatology and Atmospheric Environment, Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, University Campus, 15784 Athens, Greece
4
Hellenic National Meteorological Service, Ellinikon, 16777 Athens, Greece
*
Author to whom correspondence should be addressed.
Received: 31 August 2018 / Revised: 29 October 2018 / Accepted: 6 November 2018 / Published: 9 November 2018
(This article belongs to the Special Issue Mediterranean Tropical-Like Cyclones (Medicanes))
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Abstract

The accurate prediction of Mediterranean tropical-like cyclones, or medicanes, is an important challenge for numerical weather prediction models due to their significant adverse impact on the environment, life, and property. The aim of this study is to investigate the sensitivity of an intense medicane, which formed south of Sicily on 7 November 2014, to the microphysical, cumulus, and boundary/surface layer schemes. The non-hydrostatic Weather Research and Forecasting model (version 3.7.1) is employed. A symmetric cyclone with a deep warm core, corresponding to a medicane, develops in all of the experiments, except for the one with the Thompson microphysics. There is a significant sensitivity of different aspects of the simulated medicane to the physical parameterizations. Its intensity is mainly influenced by the boundary/surface layer scheme, while its track is mainly influenced by the representation of cumulus convection, and its duration is mainly influenced by microphysical parameterization. The modification of the drag coefficient and the roughness lengths of heat and moisture seems to improve its intensity, track, and duration. The parameterization of shallow convection, with explicitly resolved deep convection, results in a weaker medicane with a shorter lifetime. An optimum combination of physical parameterizations in order to simulate all of the characteristics of the medicane does not seem to exist. View Full-Text
Keywords: tropical-like cyclone; TLC; medicane; Qendresa; microphysical parameterization; cumulus parameterization; boundary layer parameterization; surface layer parameterization; WRF; phase-space diagrams tropical-like cyclone; TLC; medicane; Qendresa; microphysical parameterization; cumulus parameterization; boundary layer parameterization; surface layer parameterization; WRF; phase-space diagrams
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pytharoulis, I.; Kartsios, S.; Tegoulias, I.; Feidas, H.; Miglietta, M.M.; Matsangouras, I.; Karacostas, T. Sensitivity of a Mediterranean Tropical-Like Cyclone to Physical Parameterizations. Atmosphere 2018, 9, 436.

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