HR: 1340h
AN: G53A-0117    [Abstracts]
TI: Theoretical Studies And Applications Of Regional 4D GPS Tropospheric Tomography
AU: * champollion, c
EM: champoll@dstu.univ-montp2.fr
AF: Laboratoire de Dynamique de la lithosphere, Universit‚ Montpellier II / CNRS, Place E. Bataillon, Montpellier, 34000 France
AU: Masson, F
EM: fmasson@dstu.univ-montp2.fr
AF: Laboratoire de Dynamique de la lithosphere, Universit‚ Montpellier II / CNRS, Place E. Bataillon, Montpellier, 34000 France
AU: Brenot, H
AF: Laboratoire de Geophysique Interne et de Tectonophysique, UJF / CNRS, 1381, rue de la Piscine, Grenoble, 38000 France
AU: Ducrocq, V
AF: Centre National de Recherche Meteorologique, Meteo-France / CNRS, 42, avenue Gaspard Coriolis, Toulouse, 31057 France
AU: Walpersdorf, A
AF: Laboratoire de Geophysique Interne et de Tectonophysique, UJF / CNRS, 1381, rue de la Piscine, Grenoble, 38000 France
AB: 4D GPS water vapor tomography from GPS dense network (~5 km spacing between GPS stations) is now used in the field of meteorology for local studies or model validations. The typical spacing of dense networks over the world is ~50-100 km. To assess the potentiality for atmospheric studies of such networks, we have performed a field experiment in the South-Eastern France on a region regularly affected by severe precipitations. During three month we continuously record GPS data. We first extract the standard atmospheric GPS outputs (IWV and horizontal gradient) which are useful for monitoring the evolution of the precipitation systems. Several examples of tomographic models will be shown illustrating several cases of severe precipitations. Synthetic data obtained from high resolution numerical simulations provide a realistic field of water vapor and allow to perform synthetic tests. These tests inform about the spatial and temporal resolutions of the tomography.
DE: 1223 Ocean/Earth/atmosphere interactions (3339)
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
DE: 0933 Remote sensing
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting