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| Titel |
Drop size distribution comparisons between Parsivel and 2-D video disdrometers |
| VerfasserIn |
M. Thurai, W. A. Petersen, A. Tokay, C. Schultz, P. Gatlin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Precipitation: Measurement, Climatology, Remote Sensing, and Modeling (EGU Session 2010) ; Nr. 30 (2011-05-09), S.3-9 |
| Datensatznummer |
250017151
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| Publikation (Nr.) |
 copernicus.org/adgeo-30-3-2011.pdf |
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| Zusammenfassung |
| Measurements from a 2-D video disdrometer (2DVD) have been
used for drop size distribution (DSD) comparisons with co-located Parsivel
measurements in Huntsville, Alabama. The comparisons were made in terms of
the mass-weighted mean diameter, Dm, the standard deviation of the
mass-spectrum, σm, and the rainfall rate, R, all based on
1-min DSD from the two instruments. Time series comparisons show close
agreement in all three parameters for cases where R was less than 20 mm h−1.
In four cases, discrepancies in all three parameters were seen for "heavy"
events, with the Parsivel showing higher Dm, σm and R,
when R reached high values (particularly above 30 mm h−1). Possible causes for
the discrepancies include the presence of a small percentage of non-fully
melted hydrometers, with higher than expected fall velocity and with very
different axis ratios as compared with rain, indicating small hail or ice
pellets or graupel. We also present here Parsivel-to-Parsivel comparisons as
well as comparisons between two 2DVD instruments, namely a low-profile unit
and the latest generation, "compact unit" which was installed at the same
site in November 2009. The comparisons are included to assess the variability
between the same types of instrument. Correlation coefficients and the
fractional standard errors are compared. |
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