The semidiurnal variation in GPS-derived zenith neutral delay

Details The semidiurnal variation in GPS-derived zenith neutral delay The semidiurnal variation in GPS-derived zenith neutral delay

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224801h&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 24, CiteID L24801

Physics

6

Atmospheric Processes: Instruments And Techniques, Atmospheric Processes: Tides And Planetary Waves, Radio Science: Remote Sensing

Scientific paper

Zenith neutral delay (ZND) estimates derived from ground-based GPS receivers exhibit variations at harmonics of the solar day. The aim of this work is to characterize the semidiurnal (S2) variation and determine its probable origin. Data from 100 GPS sites are compared with surface pressure measurements to reveal close agreement between the estimated ZND S2 variation and the S2 surface pressure tide. Error analysis suggests that the S2 variation in ZND estimates is not due primarily to orbit, solid earth, or Earth orientation modeling errors. Atmospheric loading and mapping function errors are each expected to contribute less than 11% to the estimated ZND S2 amplitude. Local incongruities reflect the influence of water vapor or site-dependent errors.

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