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Geographica Helvetica
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Volume 46, issue 1
Geogr. Helv., 46, 21–31, 1991
https://doi.org/10.5194/gh-46-21-1991
© Author(s) 1991. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geogr. Helv., 46, 21–31, 1991
https://doi.org/10.5194/gh-46-21-1991
© Author(s) 1991. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 1991

31 Mar 1991

Nebelkarten der Schweiz

F. Troxler1 and H. Wanner2 F. Troxler and H. Wanner
  • 1Wytten-bachstraße 11, 3013 Bern, Switzerland
  • 2Geographisches Institut, Hallerstraße 12, 3012 Bern, Switzerland

Abstract. The analysis of fog distribution over Switzerland consists of two different studies:
The first deals with the spatial determination of fog frequencies and fog types for the early morning. It was realized by using the daily observations of 320 stations. This point by point information was spatially interpolated with the aid ofthe information (mean fog cover frequency) of 94 typical fog distributions detected from NOAA satellite data. The derived fog map of Switzerland includes four different fog zones: ground fog zone, fog-free intermediary and high fog (stratus) zone, fog-free slope zone, lower up-slope fog zone.
The result of the second study consists of four maps showing the fog cover frequency of the important weather types with fog layers over the Swiss Alpine foreland. They were traced out by using the above mentioned satellite data. The four maps indicate clearly that the fog and cold air distribution during anticyclonic weather situations is strongly determined by the sub-synoptic pressure and wind field.

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