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Spatio-temporal Structure of the Boundary Layer under the Impact of Mountain Waves

Kalthoff, Norbert; Adler, Bianca; Bischoff-Gauss, Inge

Abstract:
During the Hydrological cycle in the Mediterranean Experiment (HyMeX) in autumn 2012 intensive measurements were conducted in the Tavignano Valley, which extends from the centre to the coast of the island of Corsica. On the investigated day, the atmospheric boundary layer (ABL) in the valley showed a distinctive spatio-temporal variability, which resulted from the interaction and superposition of mesoscale dynamically- and thermally-driven processes and dry convection. Based on the observations, not all of the observed ABL characteristics could be explained and hypotheses on the involved processes were formulated in a previous study. To close the observational gaps and to test the hypotheses, high-resolution simulations with the COSMO (Consortium for Small-scale Modeling) model were now performed. The model was able to reproduce the main ABL characteristics and could hence be used to address the processes affecting the ABL. The main features were: in the upper part of the valley, the stable nocturnal ABL was eroded from top and bottom alike by shear-generated turbulent mixing in the vicinity of a mountain wave and buoyancy- and shear-driven surface-based turbulent mixing, leading to a very abrupt increase of the daytime ABL depth. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123067
Veröffentlicht am 31.08.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Steinbuch Centre for Computing (SCC)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 12.11.2020
Sprache Englisch
Identifikator ISSN: 0941-2948
KITopen-ID: 1000123067
HGF-Programm 12.01.02 (POF III, LK 01) Proc.res.f.multisc.predictab.of weather
Weitere HGF-Programme 46.11.01 (POF III, LK 01) Computational Science and Mathematical Methods
Erschienen in Meteorologische Zeitschrift
Verlag Borntraeger Science Publishers
Band 29
Heft 5
Seiten 409–424
Vorab online veröffentlicht am 20.07.2020
Schlagwörter mountain wave, sea breeze, upvalley wind, Corsica, thermally-driven circulation, turbulence, HyMeX, mountain boundary layer
Nachgewiesen in Dimensions
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