La Cerdanya is one of the largest valley of the Pyrenees mountain range, spreading across Spain and France (between Occitanie and Catalunya). It is about 10 km wide and 35 km long oriented ENE-WSW (whereas most valley in the Pyrenees are oriented N-S) with a relatively flat bottom at about 1000 m above sea level and mountain ridge around rising above 2900 m.

The field experiment Cerdanya-2017 took place in this valley from October 2016 to April 2017, focusing on three meteorological phenomena in mountainous terrain: cold pool, mountain waves and orographic precipitations.

The Cerdanya-2017 field experiment focuses in particular on the detailed inversion structure and the surface energy budget of cold pool, rotors and boundary layer separation in mountain waves situations, and orographic triggering and intensification of precipitations under stratiform and convective regimes.

This research is a joint effort of several teams from the Euroregion Pyrenees-Mediterranean, these teams belong to the Universities of the Balearic Islands and of Barcelona, METEO-FRANCE & CNRS and the Meteorological Service of Catalonia.

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