Comparison of brightness temperatures observed from ground-based microwave radiometers during TUC

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Abstract:

The agreement of two ground-based microwave radiometers during the Temperature, hUmidity, and Cloud (TUC) profiling campaign has been evaluated in terms of measured brightness temperature. To account effectively the instruments' specifications, we discuss and estimate an equivalent monochromatic frequency, which significantly reduces the bias introduced by ideal monochromatic modelling. The effect of this equivalent monochromatic frequency can reach 0.4 K and thus we recommend its use in further study involving TUC radiometers. This analysis showed agreement within expectations for three of the four selected pairs of channels, although results are strictly valid in a limited range. As a consequence, the derived products are expected to be of the same quality. However, the inconsistency found in the remaining pair is expected to propagate in the retrieved humidity profiles.

German
Die Übereinstimmung zweier bodengestützter Mikrowellen-Radiometer während der Temperature hUmidity and Cloud (TUC) Kampagne wurde anhand der gemessenen Helligkeitstemperaturen bewertet. Um die wirklichen Gerätespezifikationen zu bestimmen, diskutieren und schätzen wir eine äquivalente monochromatische Frequenz, welche die durch die ideale monochromatische Modellierung bewirkte Abweichung signifikant reduziert. Der Effekt dieser äquivalenten monochromatischen Frequenz kann 0,4 K erreichen, weshalb wir deren Verwendung in weiteren Studien mit TUC Radiometern empfehlen. Diese Untersuchung ergab Übereinstimmung innerhalb der erwarteten Schranken für drei von vier ausgewählten Paaren von Kanälen, obwohl die Resultate streng genommen nur in einem beschränkten Bereich gültig sind. Deshalb wird erwartet, dass die abgeleiteten Produkte von derselben Qualität sind. Jedoch muss angenommen werden, dass sich die im verbleibenden Paar gefundene Inkonsistenz auf die abgeleiteten Feuchtigkeitsprofile fortpflanzt.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2006/0096

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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