Improvements in Typhoon Forecasts with Assimilated GPS Occultation Refractivity

Improvements on Typhoon Forecast with Assimilated GPS Occultation Refractivity

Lower-Troposphere Refractivity Bias in GPS Occultation Retrievals

Analysis of atmospheric occultation data from the GPS/MET experiment has revealed that the refractivity retrievals in the lower troposphere were systematically smaller than those obtained with numerical weather prediction models. It has been suggested that the bias was due to a combination of atmospheric multipath, critical refraction, and receiver tracking errors. In this paper, we show that a...

GPS radio occultation with CHAMP

GPS radio occultation with CHAMP: monitoring of climate change parameters T. Schmidt, S. Heise, J. Wickert, G. Beyerle, and C. Reigber GeoForschungsZentrum Potsdam, Department 1: Geodesy and Remote Sensing, Potsdam, Germany Received: 20 September 2004 – Accepted: 27 October 2004 – Published: 1 December 2004 Correspondence to: T. Schmidt ([email protected]) © 2004 Author(s). This work is l...

Assimilation of GPS Radio Occultation Refractivity Data from CHAMP and SAC-C Missions over High Southern Latitudes with MM5 4DVAR

In this study, the GPS radio occultation (RO) data from the Challenging Minisatellite Payload (CHAMP) and Satellite de Aplicaciones Cientificas-C (SAC-C) missions are assimilated. An updated version of the fifth-generation Pennsylvania State University–National Center for Atmospheric Research Mesoscale Model (MM5) four-dimensional variational data assimilation system (4DVAR) is used to assess t...

GPS Occultation Measurements with GPS/MET and CHAMP

First results from the GPS radio occultation experiment aboard the German CHAMP satellite are presented. The agreement between observed temperature profiles in the upper troposphere and the lower stratosphere and temperature profiles obtained from meteorological analyses is found to be below 1 K. The data processing and analysis system (operated by GeoForschungsZentrum Potsdam) has been success...