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Tropospheric water and temperature retrieval for ASMUWARA

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Abstract:

The retrieval of tropospheric water and temperature with the ground-based and automatically operating radiometer system ASMUWARA (All-Sky MUlti WAvelength RAdiometer) is described. This instrument operates simultaneously at microwave and IR channels. Integrated water vapour (IWV) and integrated liquid water (ILW) are retrieved with a newly developed linear algorithm to an accuracy of 0.014 kgm (ILW) and 0.41 kgm (IWV), thanks to the inclusion of a channel at 151 GHz. These measurements are made for the whole hemisphere and therefore provide information about the spatial distribution of water in the troposphere. With an optimal estimation algorithm, tropospheric temperature and humidity profiles are retrieved. The results are quasi bias free with a mean error of less than 2.5 K for the temperature (less than 1 K in the lowest km above ground), and less than 1 gm for the humidity. Examples of all measurements are shown.

German
Die Bestimmung von Wasser und Temperatur der Troposphäre mit dem bodengestützten und automatischen Radiometersystem ASMUWARA (All-Sky MUlti WAvelength RAdiometer) wird beschrieben. Dieses Instrument arbeitet gleichzeitig im Mikrowellen- und Infrarotbereich. Integrierter Wasserdampf und integriertes Flüssigwasser werden durch einen neu entwickelten linearen Algorithmus mit einer Genauigkeit von 0,014 kgm−2 (ILW) und 0,41 kgm−2 (IWV) gemessen, dank der Einbeziehung eines Kanals bei 151 GHz. Diese Messungen werden auf die gesamte Hemisphäre angewandt und bieten deshalb Informationen über die örtliche Verteilung des Wassers in der Troposphäre. Mittels eines Optimal Estimation Algorithmus werden sodann Temperatur- und Feuchteprofile bestimmt. Die Profile werden ohne nennenswerten systematischen Fehler und mit einem mittleren Fehler von weniger als 2,5 K (1 K im untersten Kilometer über Boden), resp. weniger als 1 gm−3 gemessen. Beispiele aller Messungen werden gezeigt.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2006/0093

Publication date: February 1, 2006

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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