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| Titel |
MIAWARA-C, a new ground based water vapor radiometer for measurement campaigns |
| VerfasserIn |
C. Straub, A. Murk, N. Kämpfer |
| 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 ; 3, no. 5 ; Nr. 3, no. 5 (2010-09-23), S.1271-1285 |
| Datensatznummer |
250001291
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| Publikation (Nr.) |
 copernicus.org/amt-3-1271-2010.pdf |
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| Zusammenfassung |
| In this paper a new 22 GHz water vapor spectro-radiometer which has been
specifically designed for profile measurement campaigns of the middle
atmosphere is presented. The instrument is of a compact design and has a
simple set up procedure. It can be operated as a standalone instrument as it
maintains its own weather station and a calibration scheme that does not rely
on other instruments or the use of liquid nitrogen. The optical system of
MIAWARA-C combines a choked gaussian horn antenna with a parabolic mirror
which reduces the size of the instrument in comparison with currently
existing radiometers. For the data acquisition a correlation receiver is used
together with a digital cross correlating spectrometer. The complete backend
section, including the computer, is located in the same housing as the
instrument. The receiver section is temperature stabilized to minimize gain
fluctuations. Calibration of the instrument is achieved through a balancing
scheme with the sky used as the cold load and the tropospheric properties are
determined by performing regular tipping curves. Since MIAWARA-C is used in
measurement campaigns it is important to be able to determine the elevation
pointing in a simple manner as this is a crucial parameter in the calibration
process. Here we present two different methods; scanning the sky and the Sun.
Finally, we report on the first spectra and retrieved water vapor profiles
acquired during the Lapbiat campaign at the Finnish Meteorological Institute
Arctic Research Centre in Sodankylä, Finland. The performance of
MIAWARA-C is validated here by comparison of the presented profiles against
the equivalent profiles from the Microwave Limb Sounder on the EOS/Aura
satellite. |
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