Diurnal and semidiurnal atmospheric tides observed by co-located GPS and VLBI measurements |
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| Institution: | 1. Korea Astronomy and Space Science Institute, Daejeon 305-348, South Korea;2. Key Laboratory of Geological Hazards in Three Gorges, Yichang, China;3. Vienna University of Technology, Vienna 1040, Austria;1. Shenzhen Key Laboratory of Spatial Smart Sensing and Services, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China;2. Key Laboratory for Geo-Environment Monitoring of Coastal Zone of the National Administration of Surveying, Mapping and GeoInformation, Shenzhen University, Shenzhen 518060, China;3. Wuhan University, 129 Luoyu Road, Wuhan 430079, China;4. School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China;1. Institut de Physique du Globe de Strasbourg, IPGS – UMR 7516, CNRS/Université de Strasbourg (EOST), 5 rue René Descartes, 67084 Strasbourg Cedex, France;2. Observatorio Geofísico Central, Instituto Geográfico Nacional (IGN), c/ Alfonso XII 3, 28014 Madrid, Spain;3. Georges Lemaître Centre for Earth and Climate Research, Catholic University of Louvain, Louvain-la-Neuve, Belgium;4. Black Forest Observatory, Schiltach, Germany;1. National Center for Atmospheric Research (NCAR), Boulder, CO, USA;2. NASA Goddard Space Flight Center, Greenbelt, MD, USA;3. NILU, Kjeller, Norway |
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| Abstract: | The tropospheric zenith total delay (ZTD) derived from very long baseline interferometry (VLBI) is an important parameter of the atmosphere, reflecting various atmosphere-related processes and variations. In this paper, ZTD time series of the IVS rapid combined tropospheric product (2002–2006) with a 1-h resolution are used for the first time to investigate the diurnal and semidiurnal oscillations. Significant diurnal and semidiurnal variations of ZTD are found at all VLBI stations. The amplitude of the diurnal cycle S1 is 0.6–1.2 mm at most of the VLBI stations, and the amplitude of the semidiurnal cycle S2 is 0.2–1.9 mm, which nearly accord with the surface pressure tides S1/S2 and co-located GPS estimated S1/S2. The results indicate that the S1 and S2 behaviors are mainly dominated by the hydrostatic component, namely pressure tides. In general, the semidiurnal S2 amplitudes are slightly larger than the diurnal S1. While S1 shows no clear dependency on site altitude, S2 has a regular distribution with VLBI site altitude. The results are in accordance with predictions of the classic tidal theory Chapman, S., Lindzen, R.S., 1970. Atmospheric Tides, Gordon and Breach, New York]. |
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