0617140 - ÚVGZ 2026 RIV AT eng J - Článek v odborném periodiku
Matějka, M. - Řehoř, Jan - Brázdil, Rudolf - Štěpánek, Petr - Zahradníček, Pavel
Foehn warming mechanism and near-surface weather impact at the northern foreland of the Moravian-Silesian Beskids, Czech Republic.
Theoretical and Applied Climatology. Roč. 156, č. 2 (2025), č. článku 145. ISSN 0177-798X. E-ISSN 1434-4483
Grant CEP: GA ČR(CZ) GF24-14581L
Institucionální podpora: RVO:86652079
Klíčová slova: winds * temperature * model * fohn * classification * event * sofia * water * flow * lee
Obor OECD: Climatic research
Impakt faktor: 2.8, rok: 2023 ; AIS: 0.617, rok: 2023
Způsob publikování: Open access
Web výsledku:
https://link.springer.com/article/10.1007/s00704-024-05337-3DOI: https://doi.org/10.1007/s00704-024-05337-3

The interaction of large-scale flow and local topography can lead to various meteorological phenomena. A prominent example is foehn, a dry and warm leeward wind. Foehn's impact on near-surface meteorological parameters and its formation mechanisms have been extensively studied in the Alps and other regions worldwide. However, less attention has been given to pronounced warm events in leeward areas of Central European mountain ranges with peak altitudes of 1100-1600 m asl. This paper investigates three selected foehn events induced by strong southerly flow over the Moravian-Silesian Beskids range in the northeastern part of the Czech Republic. The three foehn events from 31 October 2010, 14 January 2008, and 30 October 2021 represent situations with the highest 2 m temperature differences between Lucina (a foehn-affected region) and Olomouc (an unaffected region), reaching 12.8 degrees C in the first case and 10.8 degrees C in the two other cases. In addition to in-situ observations, these events were investigated using atmospheric cross-sections and backward-trajectory analyses based on Weather Research and Forecasting (WRF) model output. Finally, isentropic drawdown with a mean descent of trajectories by similar to 400-600 m was identified as the principal foehn warming mechanism, resulting in adiabatic warming and intense surface-layer mixing.
Trvalý link: https://hdl.handle.net/11104/0365231