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| Titel |
Assessment of the performance of the inter-arrival time algorithm to identify ice shattering artifacts in cloud particle probe measurements |
| VerfasserIn |
A. Korolev, P. R. Field |
| 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. 2 ; Nr. 8, no. 2 (2015-02-17), S.761-777 |
| Datensatznummer |
250116134
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| Publikation (Nr.) |
 copernicus.org/amt-8-761-2015.pdf |
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| Zusammenfassung |
| Shattering presents a serious obstacle to current airborne in situ methods
of characterizing the microphysical properties of ice clouds. Small
shattered fragments result from the impact of natural ice crystals with the
forward parts of aircraft-mounted measurement probes. The presence of these
shattered fragments may result in a significant overestimation of the
measured concentration of small ice crystals, contaminating the measurement
of the ice particle size distribution (PSD). One method of identifying
shattered particles is to use an inter-arrival time algorithm. This method is
based on the assumption that shattered fragments form spatial clusters that
have short inter-arrival times between particles, relative to natural
particles, when they pass through the sample volume of the probe. The
inter-arrival time algorithm is a successful technique for the classification
of shattering artifacts and natural particles. This study assesses the
limitations and efficiency of the inter-arrival time algorithm. The analysis
has been performed using simultaneous measurements of two-dimensional (2-D) optical array
probes with the standard and antishattering "K-tips" collected during the
Airborne Icing Instrumentation Experiment (AIIE). It is shown that the
efficiency of the algorithm depends on ice particle size, concentration and
habit. Additional numerical simulations indicate that the effectiveness of
the inter-arrival time algorithm to eliminate shattering artifacts can be
significantly restricted in some cases. Improvements to the inter-arrival
time algorithm are discussed. It is demonstrated that blind application of the
inter-arrival time algorithm cannot filter out all shattered aggregates. To
mitigate against the effects of shattering, the inter-arrival time algorithm
should be used together with other means, such as antishattering tips and
specially designed algorithms for segregation of shattered artifacts and
natural particles. |
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