HR: 1340h
AN: A43A-0067    [Abstracts]
TI: Assimilation of Zenith Total Delay Data From European GPS Stations in Meteo France 4DVAR
AU: * POLI, P
EM: PAUL.POLI@METEO.FR
AF: METEO FRANCE, CENTRE NATIONAL DE RECHERCHES METEOROLOGIQUES CNRM/GMAP 42 AVENUE G. CORIOLIS, TOULOUSE, 31057 France
AU: MOLL, P
EM: PATRICK.MOLL@METEO.FR
AF: METEO FRANCE, CENTRE NATIONAL DE RECHERCHES METEOROLOGIQUES CNRM/GMAP 42 AVENUE G. CORIOLIS, TOULOUSE, 31057 France
AU: RABIER, F
EM: FLORENCE.RABIER@METEO.FR
AF: METEO FRANCE, CENTRE NATIONAL DE RECHERCHES METEOROLOGIQUES CNRM/GMAP 42 AVENUE G. CORIOLIS, TOULOUSE, 31057 France
AB: The Zenith Total Delay (ZTD) data collected by various european networks of ground-based Global Positioning System (GPS) stations have been made available to the operational meterological centers in near-real time since 2004, thanks to the efforts of the Targeting Optimal Use of Global Positioning System Humidity measurements in meteorology (TOUGH) project. This paper presents forecast impact trials of ZTD data from such networks in the global Four-Dimensional Variational (4DVAR) Integrated Forecasting System (IFS)-Arpege. We describe here our implementation of the ZTD assimilation, as well as the specific pre-processing that we developed for the ZTD data, including quality control and observation error estimation. Results obtained from forecast trials and showing the impact of the ZTD data on the forecasts will also be presented.
DE: 3315 Data assimilation
DE: 3364 Synoptic-scale meteorology
DE: 3394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005