In current works at the Department of Meteorology and Geophysics at the University of Vienna, efforts are being made to investigate the cold air outflow from a basin cold pool and to classify the cold air pool events (i.e. patterns of disturbances) that form in the Grünloch during a disturbed night. To our knowledge, no efforts have been made so far in order to investigate the interrelation between the occurrence of extreme temperature minima in a doline and the properties of the present air mass which can be obtained from measurements in the vicinity of a sinkhole.
For our study, we were able to use data from the Kleiner Hühnerkogel (1601 m MSL), an isolated mountain peak south west of Grünloch and from the Lechner Sattel (1323 m MSL), were we have installed automatic weather stations, as well as synoptic data from Hoher Sonnblick (3106 m MSL), Feuerkogel (1618 m MSL) and Rax (1547 m MSL) which show a high correlation (r > 0.9) to Kleiner Hühnerkogel. Further interest lies in the correlation of remote stations and temperature minima in the doline as a function of different sorts of air masses and under different ambient conditions (e.g. snow cover in the doline/snow-free soil, summer/winter), with regard to the known patterns of disturbances by means of cold air pool events.
Since further field experiments in the Gstettneralm sinkhole are planned, the proposed presentation will deliver a review of current and future research activities. It will put emphasis on the described investigation of temperature minima in correlation with air mass properties. First results will be presented.