Source regions

low-pressure system above the north atlantic
low-pressure system above the north atlantic
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low-pressure system above the north atlantic
low-pressure system above the north atlantic

The importance of the North Atlantic

The amount and origin of the moisture that is transported to Switzerland depends on large-scale atmospheric circulation and the resulting winds. As shown in Figure below, about 40% of the precipitation that falls in Switzerland is evaporated from the North Atlantic. Another 25% comes from the Mediterranean, 20% from the land surface of Central Europe, and 15% from the North and Baltic Seas. However, these figures can vary significantly depending on the season. In winter, the North Atlantic contributes an even greater proportion of moisture, while in summer the Central European land area plays a more important role than is shown in the illustration. In addition, the Alps act as a weather divide, often preventing the transport of moisture from one side of the mountains to the other. Thus, southern Switzerland receives most of its moisture from the Mediterranean while northern Switzerland gets it from the northern seas. In general, the source regions for moisture change significantly throughout the year. This doesn’t necessarily affect the total annual rainfall in an area, however.

Switzerland’s moisture sources, 1995-2002 (after Sodemann et al., 2010).
Switzerland’s moisture sources, 1995-2002 (after Sodemann et al., 2010).
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Switzerland’s moisture sources, 1995-2002 (after Sodemann et al., 2010).
Switzerland’s moisture sources, 1995-2002 (after Sodemann et al., 2010).
Wasser in der Schweiz
  • 2017

Wasser in der Schweiz

Wasser ist in der Schweiz selten knapp und meistens gesundheitlich unbedenklich. Durch neue Konsummuster, die Klimaänderung und energiepolitische Entscheidungen verändern sich sowohl die Verfügbarkeit wie die Nutzung des Wassers.

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2019
May 26
  • Education/Training

Meteorologiekurs

2019
Jun 24
2019
Jun 27
Klimabulletin Jahr 2018
  • 2018

Klimabulletin Jahr 2018

Wärme und Regenarmut ohne Ende, so präsentierte sich das Jahr 2018 in der Schweiz. Zehn von zwölf Monatstemperaturen lagen deutlich über der Norm, sechs davon im extremen Bereich. Die unendliche Wärme führte nicht nur zu einem neuen Jahresrekord, auch das Sommerhalbjahr war so warm wie noch nie seit Messbeginn 1864. Begleitet wurde die Rekordwärme von einer ungewöhnlichen monatelangen Regenarmut. In der Ostschweiz entwickelte sich das massive Regendefizit zu einem Jahrhundertereignis.
Tal Gletscher

Climate change and Hydrology

The total water supply in Switzerland will change only slightly over the next century. However, the seasonality of precipitation will change, with more precipitation falling during the winter and less during the summer.