TRF issues when using a numerical weather model for atmosphere zenith delay

Author: S. Mark Leidner, John M. Henderson and A. Neill
Date: 
January 22, 2005
Type: 
Article
Venue: 
European Geosciences Union General Assembly
Citation: 

Niell, A., M. Leidner, and J. Henderson, 2005: TRF issues when using a numerical weather model for atmosphere zenith delay. Preprints, European Geosciences Union General Assembly 2005, Vienna, Austria, CD-ROM, EGU05-A-09746.

Resource File: 

There is a large correlation between the estimates of atmosphere zenith delay and station height in space geodetic measurements. Therefore any errors involved in the estimation of the troposphere delay affect the site height and thus the terrestrial reference frame (TRF). Numerical Weather Models (NWMs) have recently begun to be used to provide mapping functions for the troposphere delay because they can provide estimates or predictions of meteorological parameters that are impractical to obtain by in situ or remotely sensed observations. However, the horizontal resolution that can be attained is dependent on computing resources. Given the information that NWMs can provide, we have begun an investigation to evaluate possible improvement in VLBI and GPS site position estimates using NWMs with finer horizontal resolutions than have generally been used to date.