Comparison of Wet Path Delays, observed with Water Vapour Radiometers, Sun Spectrometer, Radiosondes, GPS and VLBI at the Fundamental Station Wettzell.

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Presentation transcript:

Comparison of Wet Path Delays, observed with Water Vapour Radiometers, Sun Spectrometer, Radiosondes, GPS and VLBI at the Fundamental Station Wettzell Wolfgang Schlüter, Walter Schwarz, BKG, Fundamentalstation Wettzell Beat Bürki, Alexander Somieski, ETH, Eidgenössische Technische Hochschule Zürich/CH Petra Häfele, Univ. FAF, Universität der Bundeswehr, München Jungho Cho Astronomy and Space Science Institute, Korea

Motivation The water vapour in the atmosphere contributes significantly to the tropospheric refraction. Geodetic observations, in particular observations in the microwave domain as GPS and VLBI are suffering from the inhomogeneous distribution. Even if the analysis models care for the influence, it seems still to be of interest to observe independently the water vapour and its influence to the observations with Water Vapour Radiometers and other devices. Collocation Experiment to investigate qualification of WVR and observing devices for CONT05

Experiment at the FSW Period April 4 to 22, 2005 –Core period April Collocation of –3 WVR ETH type BKG and ETH –2 WVR Radiometrics BKG/Univ. Dresden Univ. FAF –1 Sun Spectrometer ETH –Balloon Radiosonds BKG/ETH

Water Vapour Radiometer Water Vapour Radiometers 2 Radiometrics –Univ. FAF –Univ. Dreden/BKG 3 ETH-type WVR –ETH –BKG Operation in April Radiometrics reliable (3mm) 1 Radiometrics failed 1 ETH system o.k (6mm) 2 ETH instable, not usable

Solar Spectrometer “GEMOSS” GEMOSS: Prototype of a “GEodetic MObile Solar Spectrometer” Developed at the ETH by Alexander Somieski Based on “Differential Optical Absorption Spectroscopy” Simultaneous observation of H 2 O adsorption lines between 728 and 915 nm

Balloon Radiosonds Temperature-, humidity-, pressure profiles Periods from April 11 to 20 at 12:00 and 24:00 UTC Some profile observations were successful, some were not continuous, even some failed

Workshop Internal Workshop at the Univ. FAF at July 26, 2005 Participants: –Univ. BW:Hans Heister, Petra Häfele –ETH:Beat Bürki –FS-W:Wolfgang Schlüter, Walter Schwarz, Stefan Riepl, Jungho Cho (Guest,Korea Astrononomy and Space Science Institute) –MPIfR:Alan Roy, Helge Rottmann, Ute Teuber –IRAM: Michael Bremer –HartRAO:Ludwig Combrinck, Attie Combrinck Discussion of the observations Comparison of the Results –GPS-Results from GFZ-Solution –VLBI- IVS Solution from Vienna Discussion how to support CONT 05 at Hartebesthoeck

Comparison of ZWD from GPS and ETH-type-VWR ETH WVR: RMS: ~ 6-8 mm Resolution ~6min Different offsets: ~1-4 cm failures unreliable

Comparison of ZWD from GPS and Radiometrics WVR Radiometrics: RMS: ~3-4mm Resolution 5min R42 Azimuth drive failed Offset R43 and R42 ~ a few mm Offset R43 to GPS: not really significant

Comparison of ZWD from GPS and VLBI and Radiosonde and Solar Spectrometer GEMOSS RMS a few mm High resolution in time Offset 1-2 cm Radiosondes Offsets 1cm to GPS One value per launch

Conclusions Radiometrics, RMS ~3-4mm, small offset (significant?) –Best agreement with Radiosondes, GPS, etc. ETH type systems, RMS ~ 6-8mm –Systematic biases +/- 1-2cm (ZA) between various techniques –WA and WC failed GEMOS bias of ~1-2 cm, only during sunshine, for calibration ? Support for CONT 05 –for Wettzell R42, GEMOSS, Radiosondes –for Kokee Park R43 –for Hartebesthoek ETH type ZA + Radiosondes (+ETH type WC) All techniques need more investigation for improvement, which is worth as they have higher timely resolution as VLBI and GPS!

ZWD observations at FSW

WVR-Observation at Kokee Park