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- Title
On the potential of 2-D-Video Disdrometer technique to measure micro physical parameters of solid precipitation.
- Authors
Bernauer, F.; Hürkamp, K.; Rühm, W.; Tschiersch, J.
- Abstract
Detailed characterization and classification of precipitation is an important task in atmospheric research. Line scanning 2-D-video disdrometer technique is well established for rain observations. The two orthogonal views taken of each hydrometeor passing the sensitive area of the instrument qualify this technique especially for detailed characterization of non symmetric solid hydrometeors. However, in case of solid precipitation problems related to the matching algorithm have to be considered and the user must be aware of the limited spacial resolution when size and shape descriptors are analyzed. This work has the aim of clarifying the potential of 2-D-video disdrometer technique in deriving size, velocity and shape parameters from single recorded pictures. The need of implementing a matching algorithm suitable for mixed and solid phase precipitation is highlighted as an essential step in data evaluation. For this purpose simple reproducible experiments with solid steel spheres and irregularly shaped styrofoam particles are conducted. Self-consistency of shape parameter measurements is tested in 40 cases of real snow fall. As result it was found, that reliable size and shape characterization with a relative standard deviation of less than 5% is only possible for particles larger than 1 mm. For particles between 0.5 and 1.0mm the relative standard deviation can grow up to 22% for the volume, 17% for size parameters and 14% for shape descriptors. Testing the adapted matching algorithm with a reproducible experiment with styrofoam particles a mismatch probability of less than 2.5% was found. For shape parameter measurements in case of real solid phase precipitation the 2DVD shows self-consistent behavior.
- Subjects
ATMOSPHERIC pressure; METEOROLOGICAL precipitation; HYDROMETEOROLOGY; TEMPERATURE; PLASTICS as art material
- Publication
Atmospheric Measurement Techniques Discussions, 2015, Vol 8, Issue 3, p3087
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amtd-8-3087-2015