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| Titel |
Correction of raindrop size distributions measured by Parsivel disdrometers, using a two-dimensional video disdrometer as a reference |
| VerfasserIn |
T. H. Raupach, A. Berne |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-16), S.343-365 |
| Datensatznummer |
250116057
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| Publikation (Nr.) |
 copernicus.org/amt-8-343-2015.pdf |
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| Zusammenfassung |
| The raindrop size distribution (DSD) quantifies the microstructure
of rainfall and is critical to studying precipitation processes. We
present a method to improve the accuracy of DSD measurements from
Parsivel (particle size and velocity) disdrometers, using a two-dimensional video disdrometer
(2DVD) as a reference instrument. Parsivel disdrometers bin
raindrops into velocity and equivolume diameter classes, but may
misestimate the number of drops per class. In our correction
method, drop velocities are corrected with reference to theoretical
models of terminal drop velocity. We define a filter for raw
disdrometer measurements to remove particles that are unlikely to be
plausible raindrops. Drop concentrations are corrected such that on
average the Parsivel concentrations match those recorded by a
2DVD. The correction can be trained on and applied to data from both
generations of OTT Parsivel disdrometers, and indeed any disdrometer
in general. The method was applied to data collected during field
campaigns in Mediterranean France for a network of first- and
second-generation Parsivel disdrometers, and on a first-generation
Parsivel in Payerne, Switzerland. We compared the moments of the
resulting DSDs to those of a collocated 2DVD, and the resulting
DSD-derived rain rates to collocated rain gauges. The correction
improved the accuracy of the moments of the Parsivel DSDs, and in
the majority of cases the rain rate match with collocated rain
gauges was improved. In addition, the correction was shown to be
similar for two different climatologies, suggesting its general
applicability. |
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