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Lookup NU author(s): Professor Geoffrey Blewitt
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The precision of vertical position and atmospheric water vapor content determined by the Global Positioning System (GPS) is limited by errors due to tropospheric delay. One factor is the spatial and temporal variability in tropospheric refractivity caused by passing weather fronts. We can explain some of the temporal characteristics of estimated tropospheric delay in terms of a simple path delay model as a function of frontal parameters. These results suggest that GPS could be used to estimate the geometry and passage time of a frontal zone. We have developed indices which detect tropospheric variability from GPS data alone; the detection rate of fronts with this approach is up to 70%. Once detected, we eliminated days affected by fronts or other tropospheric variability from the time series of station height estimates, resulting in improved long-term repeatability. The additional variance attributable to fronts is estimated to be up to 10 mm2 at Herstmonceux, England, where fronts occur every 2-3 days. The effect of fronts on the horizontal station component is up to 80% smaller than for the vertical. Studies in the field of GPS meteorology may be improved by estimating frontal parameters. Copyright 1999 by the American Geophysical Union.
Author(s): Gregorius TLH, Blewitt G
Publication type: Article
Publication status: Published
Journal: Journal of Geophysical Research B: Solid Earth
Year: 1999
Volume: 104
Issue: 7
Pages: 15261-15279
Print publication date: 10/07/1999
ISSN (print): 0148-0227
ISSN (electronic): 2156-2202
Publisher: American Geophysical Union
URL: http://dx.doi.org/10.1029/1998JB900067
DOI: 10.1029/1998JB900067
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