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Fog - low stratus (FLS) regimes on Corsica with wind and PBLH as key drivers

  • The French Mediterranean island of Corsica is already today confronted with a clear tendency towards water shortage, leading not only to socio-economical, but also to ecological problems. A potential, but not very widespread source of water is the presence of near-ground clouds, mostly fog. In this study, we investigate fog-low stratus (FLS) frequencies in Corsica, derived from a data set of Meteosat Second Generation SEVIRI, whereby a distinction between fog and low stratus is hardly feasible using remote sensing data. The FLS frequency was studied with respect to its interaction with distinct locally-generated wind and its dependence on the planetary boundary layer height (PBLH) obtained by ERA5 reanalysis (the fifth generation of the European Centre for Medium-Range Weather Forecasts, ECMWF). Results show that radiation FLS is formed in coastal areas at sunrise, with low PBLH. On the other hand, in the interior of the island at sunset, a maximum of advection FLS is formed, fostered by locally-generated and related transport ofThe French Mediterranean island of Corsica is already today confronted with a clear tendency towards water shortage, leading not only to socio-economical, but also to ecological problems. A potential, but not very widespread source of water is the presence of near-ground clouds, mostly fog. In this study, we investigate fog-low stratus (FLS) frequencies in Corsica, derived from a data set of Meteosat Second Generation SEVIRI, whereby a distinction between fog and low stratus is hardly feasible using remote sensing data. The FLS frequency was studied with respect to its interaction with distinct locally-generated wind and its dependence on the planetary boundary layer height (PBLH) obtained by ERA5 reanalysis (the fifth generation of the European Centre for Medium-Range Weather Forecasts, ECMWF). Results show that radiation FLS is formed in coastal areas at sunrise, with low PBLH. On the other hand, in the interior of the island at sunset, a maximum of advection FLS is formed, fostered by locally-generated and related transport of moisture. On the east side of the island, FLS frequency is lower throughout the year due to frequent lee situations. This situation is reinforced by reduced synoptic moisture transport by westerly winds, so that westerly exposed slopes benefit from moisture input by FLS formation.show moreshow less

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Author: Isabel KnerrORCiD, Katja TrachteORCiD, Sebastian Egli, Johannes A. C. Barth, Achim Bräuning, Emilie Garel, Martin Häusser, Frédéric HuneauORCiD, Tobias R. Juhlke, Sébastien SantoniORCiD, Sonja Szymczak, Robert van Geldern, Jörg Bendix
DOI:https://doi.org/10.1016/j.atmosres.2021.105731
ISSN:0169-8095
Title of the source (English):Atmospheric Research
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2021
Tag:Corsica; Fog Low Stratus; Locally-generated wind; Mediterranean; Meteosat Second Generation (MSG); Planetary Boundary Layer
Volume/Year:261
Article number:105731
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Atmosphärische Prozesse
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