# Characteristics and evolution of diurnal foehn events in the Dead Sea valley

Vüllers, Jutta; Mayr, Georg J.; Corsmeier, Ulrich; Kottmeier, Christoph

Abstract:
This paper investigates frequently occurring foehn in the Dead Sea valley. For the first time, sophisticated, high-resolution measurements were performed to investigate the horizontal and vertical flow field. In up to 72 % of the days in summer, foehn was observed at the eastern slope of the Judean Mountains around sunset. Furthermore, the results also revealed that in approximately 10 % of the cases the foehn detached from the slope and only affected elevated layers of the valley atmosphere. Lidar measurements showed that there are two main types of foehn. Type I has a duration of approximately 2–3 h and a mean maximum velocity of 5.5 m s$^{-1}$ and does not propagate far into the valley, whereas type II affects the whole valley, as it propagates across the valley to the eastern side. Type II reaches mean maximum wind velocities of 11 m s$^{-1}$ and has a duration of about 4–5 h. A case study of a type II foehn shows that foehn is initiated by the horizontal temperature gradient across the mountain range. In the investigated case this was caused by an amplified heating and delayed cooling of the valley boundary layer in the afterno ... mehr

 Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO) Publikationstyp Zeitschriftenaufsatz Jahr 2018 Sprache Englisch Identifikator ISSN: 1680-7324 URN: urn:nbn:de:swb:90-893249 KITopen-ID: 1000089324 Erschienen in Atmospheric chemistry and physics Band 18 Heft 24 Seiten 18169–18186 Vorab online veröffentlicht am 21.12.2018 Nachgewiesen in ScopusWeb of Science
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