A direct evaluation of the Geosat altimeter wet atmospheric range delay using very long baseline interferometry observations

Details A direct evaluation of the Geosat altimeter wet atmospheric range delay using very long baseline interferometry observations A direct evaluation of the Geosat altimeter wet atmospheric range delay using very long baseline interferometry observations

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ijrs...14.1723k&link_type=abstract

International Journal of Remote Sensing (ISSN 0143-1161), vol. 14, no. 9, p. 1723-1733.

Computer Science

Atmospheric Refraction, Geosat Satellites, Ocean Surface, Satellite Altimetry, Very Long Base Interferometry, Weather Forecasting, Atmospheric Attenuation, Radio Frequencies, Radio Telescopes, Topography, Troposphere

Scientific paper

The overall accuracy of the U.S. Navy Geosat altimeter wet atmospheric range delay caused by refraction through the atmosphere is directly assessed by comparing the estimates made from the DMSP Special Sensor Microwave/Imager and the U.S. Navy Fleet Numerical Ocean Center forecast model for Geosat with measurements of total zenith columnar water vapor content from four VLBI sites. The assessment is made by comparing time series of range delay from various methods at each location. To determine the importance of diurnal variation in water vapor content in noncoincident estimates, the VLBI measurements were made at 15-min intervals over a few days. The VLBI measurements showed strong diurnal variations in columnar water vapor at several sites, causing errors of the order 3 cm rms in any noncoincident measurement of the wet troposphere range delay. These errors have an effect on studies of annual and interannual changes in sea level with Geosat data.

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