G43C-03
Propagation delays induced in GNSS signals during extreme conditions of the neutral atmosphere
Thursday, 17 December 2015: 14:10
2002 (Moscone West)
Hugues Henri Brenot1, Jonathan Jones2, Riccardo Biondi3, Lieven Clarisse4, Laurent Delobbe5 and Michel Van Roozendael1, (1)Belgian Institute for Space Aeronomy, Brussels, Belgium, (2)Met Office, Exeter, United Kingdom, (3)University of Graz, Graz, Austria, (4)Université Libre de Bruxelles, Bruxelles, Belgium, (5)Royal Meteorological Institute, Brussel, Belgium
Abstract:
Data records from GNSS ground and space-based receivers can be used to estimate delays and water vapour content of the neutral atmosphere. Such measurements allow a better monitoring of severe weather situations, typically caused by deep convection. In the frame of the GNSS4SWEC EU-COST action, we address new and improved capabilities from concurrent developments in both the GNSS and meteorological communities with regard to extreme weather. With this approach, both the model of atmosphere (applied in the adjustment of the parameters), and the formulation of the total atmospheric refractivity, are critical, specially during heavy rain with high content of hydrometeors. Some tests of sensitivity will illustrate this topic. For a selection of case studies, this presentation will show the interest and limitation of GNSS retrievals for the monitoring of the neutral atmosphere (i.e. application to nowcasting and forecasting in case of extreme weather, and monitoring of plume in case of a volcanic eruption). We will present a new approach in the correction of slant delays, that improves monitoring during extreme conditions, specifically for tomographic applications.
