Berlin 2012 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 8: Methods 1
UP 8.4: Vortrag
Mittwoch, 28. März 2012, 18:15–18:30, HFT-FT 131
Microwave transmission: A new tool for remote sensing precipitation and humidity — •Christian Chwala1, Uwe Siart2, Andreas Gmeiner1, Susanne Hipp2, and Harald Kunstmann1 — 1Karlsruher Institut für Technologie, Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU), Garmisch-Partenkirchen — 2Lehrstuhl für Hochfrequenztechnik, Technische Universität München
Recent high resolution models for weather forecast and hydrology need precise observation data of precipitation and humidity to allow for correct initialization and validation. We present a new technique which uses both attenuation and phase shift data of microwave transmission through the atmosphere, aiming to complement and thus to improve the established methods using station and weather radar data.
For line integrated precipitation observation we analyze attenuation data from commercial microwave backhaul links around Garmisch-Partenkirchen. Because of severe fluctuations even during dry periods, we introduce an algorithm based on spectral time series analysis to distinguish between rainy and dry periods. After processing, comparison with rain gauge and weather radar data shows good correlation.
Additionally, we operate a dual frequency (22.235 GHz and 34.8 GHz) and dual polarization transmission experiment at a hydrometeorological test site in the TERENO pre-alpine observatory. Besides attenuation data its coherent monostatic configuration provides very precise phase information. This allowed us to derive very fast line integrated measurements of absolute humidity.