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| Titel |
Evaluation of the MOZAIC Capacitive Hygrometer during the airborne field study CIRRUS-III |
| VerfasserIn |
P. Neis, H. G. J. Smit, M. Krämer, N. Spelten, A. Petzold |
| 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. 3 ; Nr. 8, no. 3 (2015-03-13), S.1233-1243 |
| Datensatznummer |
250116213
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| Publikation (Nr.) |
 copernicus.org/amt-8-1233-2015.pdf |
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| Zusammenfassung |
| The MOZAIC Capacitive Hygrometer (MCH) is usually operated aboard
passenger aircraft in the framework of MOZAIC (Measurement of Ozone by Airbus
In-Service Aircraft) for measuring atmospheric relative humidity (RH). In
order to evaluate the performance of the MCH, the instrument was operated
aboard a Learjet 35A research aircraft as part of the CIRRUS-III field study
together with a closed-cell Lyman-α fluorescence hygrometer (Fast in situ Stratospheric Hygrometer, or FISH) and
an open-path tunable diode laser system (Open-path
Jülich Stratospheric TDL ExpeRiment, or OJSTER) for water vapour
measurement. After reducing the CIRRUS-III data set to data corresponding to
MOZAIC aircraft operation conditions, the 1 Hz RH data cross correlation
between the MCH and reference instruments FISH (clear sky) and OJSTER (in-cirrus)
yielded a remarkably good agreement of R2 = 0.92 and slope
m = 1.02 and provided a MCH uncertainty of 5% RH. Probability
distribution functions of RH deduced from the MCH and reference instruments
agreed well between 10 and 70% RH with respect to liquid water in the
ambient temperature range of ca. −70 to −40 °C. The use of
MCH data is limited to sensor temperatures above the calibration limit of
Tsensor = −40 °C (corresponds to ambient temperature
of Tambient = −70 °C at typical cruising speed of
long-haul passenger aircraft). Good performance of the MCH for clear sky as well
as for in-cirrus conditions demonstrated the sensor robustness also for
operation inside ice clouds. |
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