Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 3: Meßtechnik

UP 3.7: Vortrag

Mittwoch, 25. März 2015, 19:00–19:15, G/gHS

Ground based in-situ measurements of snow fall with a 2D-Video Disdrometer on Mt. Zugspitze, Germany — •Felix Bernauer¹, Martin Schwinzerl², Kerstin Hürkamp¹, Werner Rühm¹ und Jochen Tschiersch¹ — ¹Institute of Radiation Protection, Helmholtz Zentrum Muenchen, 85764 Neuherberg, Germany — ²Joanneum Research, 8010 Graz Austria

The measurement of micro physical properties of snow fall is a challenging task that is essential in many areas of research e. g. wet deposition of atmospheric pollution. In this contribution we analyze the suitability of a 2D-video-disdrometer (2DVD by Joanneum Research) to measure shape parameters of solid precipitation and present a simple and reproducible method for precipitation event classification with a focus on solid type precipitation. For our study we installed the 2DVD at a high alpine site in southern Germany (the Environmental Research Station Schneefernerhaus (UFS) on Mt. Zugspitze, 2650m a.s.l.). A very important prerequisite for our results is to introduce a new matching algorithm suitable for solid and mixed phase hydrometeors which allows classification without artifacts. An experiment with steel spheres in a size range from 0.5mm to 10.0mm showed that simple geometries can be represented very well with shape parameters measured with the 2DVD. Analysis of 40 snow fall events and comparison with man made observations showed that solid type precipitation can be reliably differentiated in three classes of dominating hydrometeor types and three classes of riming. Addidionaly liquid and mixed phase precipitation can be classified.