The Gruenloch Experiment - Lunz am See, Austria

- The Grünloch-Experiment (Lunz am See, Austria)

- Meteorological Field Campaign about temperature inversions in Alpine basins

	Cold pool outflow During a calm night the slopes around the basin continuously produce cold air which flows down towards the sinkhole. Once the basin is filled with cold air up to the lowest saddle, the downslope flows do not affect the lower basin atmosphere anymore, they rather move above the basin and through the lowest saddle.

Homogeneous outflow out of the sinkhole at the lowest saddle (wind speed and direction constant)

The same scheme during the tethersonde experiment. Wind from SE with 0.5 to 1 m/s

3 soundings within 1 hour before sunrise > wind speed below saddle <0.1 m/s constant direction
between 50 and 80m above basin floor -> Depth of outflow ~25m

- last update: 05.12.2002 | contact: stefan@eisenbach.at|