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METEOROLOGISCH - GEOPHYSIKALISCHES KOLLOQUIUM SS 2009 Eine Lehrveranstaltung des Instituts für Meteorologie und Geophysik der Universität Wien Zeit: Dienstag, 19.5. 2009, 16.00 Uhr s.t. Ort: UZAII, Althanstrasse 14, 1090 Wien, Geozentrum, Hörsaal 6, Ebene 2 Ao. Univ. Prof. Dr. Robert Weber Institut für Geodäsie und Geophysik TU Wien Precipitable water determined from regional GNSS station networks In Europe and abroad several regional project were initiated to derive the zenith wet delay (ZWD) from ground based GNSS observation data. ZWD-estimations are subsequently used as additional data source for Numerical Weather Models in order to obtain high temporal and spatial resolution of the humidity field with an improved accuracy. Errors in the weather forecast analysis show up in particular in alpine areas, where predicted models do not reproduce the mountain atmosphere correctly. In this presentation the project GNSSMET is demonstrated, which makes use of continuous measurements of a regional network consisting of 8 GPS/GLONASS reference stations, located in Carinthia, Austria. This network has been extended with surrounding IGS and EUREF stations. The aim of the project is to provide GNSS based measurements of the tropospheric water vapour content with a temporal delay of less than one hour to use them within the INCA (Integrated Nowcasting through Comprehensive Analysis) system, operated by the Austrian Meteorological Service (ZAMG). We quantify the impact of the GNSS data on INCA forecasts and the contribution of already existing GLONASS data (in addition to GPS observations) on the ZWD estimation. Moreover, it is planned to qualify potential improvements provided by a fully operational GALILEO system. Compared to the current situation an improvement in accuracy of the ZWD by about 30-40% is expected as well as a higher temporal (30 min or less) resolution of the estimates. Koordination: Ao.Univ.Prof. Dr. Leopold Haimberger, Tel. 4277-53712, [email protected]
