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| Titel |
A comparison of rainfall measurements from multiple instruments |
| VerfasserIn |
X. C. Liu, T. C. Gao, L. Liu |
| 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 ; 6, no. 7 ; Nr. 6, no. 7 (2013-07-02), S.1585-1595 |
| Datensatznummer |
250017913
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| Publikation (Nr.) |
 copernicus.org/amt-6-1585-2013.pdf |
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| Zusammenfassung |
| Simultaneous observations of rainfall collected by a tipping bucket rain
gauge (TBRG), a weighing rain gauge (WRG), an optical rain gauge
(ORG), a present weather detector (PWD), a Joss–Waldvogel disdrometer (JWD),
and a 2-D video disdrometer (2DVD) during January to October 2012 were
analyzed to evaluate how accurately they measure rainfall and drop size
distributions (DSDs). For the long-term observations, there were different
discrepancies in rain amounts from six instruments on the order of 0% to
27.7%. The TBRG, WRG, and ORG have a good agreement, while the PWD and
2DVD record higher and the JWD lower rain rates when
R > 20 mm h−1, the ORG agrees well with JWD and 2DVD,
while the TBRG records higher and the WRG lower rain rates when
R > 20 mm h−1. Compared with the TBRG and WRG,
optical and impact instruments can measure the rain rate accurately in the
light rain. The overall DSDs of JWD and 2DVD agree well with each other,
except for the small raindrops (D < 1 mm). JWD can measure
more moderate-size raindrops (0.3 mm < D < 1.5 mm)
than 2DVD, but 2DVD can measure more small-size raindrops
(D < 0.3 mm). 2DVD has a larger measurement range; more
overall raindrops can be measured by 2DVD than by JWD in different rain rate
regimes. But small raindrops might be underestimated by 2DVD when
R > 15 mm h−1. The small raindrops tend to be omitted
in the more large-size raindrops due to the shadow effect of light. Therefore, the
measurement accuracy of small raindrops in the heavy rainfall from 2DVD should
be handled carefully. |
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