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Combining UHF radar wind profiler and microwave radiometer for the estimation of atmospheric humidity profiles

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Abstract:

Capabilities of an integrated ground-based system for the operational measurement of humidity profiles, using both an UHF wind profiler and a radiometer, are discussed. The combination takes advantage of the complementary characteristics of each instrument. The radiometer is able to give a fair evaluation of smoothed humidity and temperature profiles, while the wind profiler is more suited for gradient estimations between range gates. Measurements of high-resolution humidity profiles in the combined sensor approach are based on the calculation of the refractive index gradients from the radar return signal power and signal width. Various means are then tested to combine these measurements with the radiometric data in order to deduce the most accurate humidity profile. This study is performed on 51 cases of UHF profiles during which 37 radiometric measurements were available. They have been selected on a data set collected during the international COST 720 Temperature, hUmidity and Cloud (TUC) profiling experiment held in Payerne (CH). During the experiment a LAP-3000 wind profiling radar and a Radiometrics temperature and humidity profiling radiometer operated simultaneously with Swiss radiosonde SRS 400.

German
Das Leistungsvermögen eines integrierten bodengestützten Systems zur operationellen Messung von Feuchteprofilen, welches aus einem UHF Windprofiler und einem Radiometer besteht, werden diskutiert. Die Kombination nützt die komplementären Eigenschaften jedes Instruments aus. Das Radiometer ermöglicht eine ausreichende Ermittlung von geglätteten Feuchte- und Temperaturprofilen, während der Windprofiler besser geeignet ist für die Abschätzung der Gradienten zwischen den jeweiligen Entfernungsbereichen. Messungen von hochaufgelösten Feuchteprofilen basieren bei kombinierten Sensoren auf der Berechnung von Brechungsindex-Gradienten aus Radar-Rückstreusignalstärke und -signalbreite. Verschiedene Methoden zur genauest-möglichen Berechnung des Feuchteprofils aus einer Kombination dieser Messungen mit Radiometerdaten werden dann getestet. Diese Untersuchung basiert auf 51 UHF Profilen, während welchen 37 Radiometermessungen verfügbar waren. Sie wurden ausgewählt aus einem Datensatz der während des Internationalen COST 720 Temperatur-, Feuchte- und Wolken (TUC) Profiling Experiments in Payerne (CH) erhoben wurde. Während des Experiments liefen ein LAP-3000 Windprofiler und ein Radiometrics Temperaturund Feuchteprofil-Radiometer gleichzeitig mit Schweizer Radiosonden SRS 400.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2006/0102

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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