Investigation of sea level around the island of Gavdos from ten years of TOPEX/POSEIDON satellite altimetry data (original) (raw)
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Satellite altimetry provides exceptional means for absolute and undisputable monitoring of changes in sea level and inland waters (rivers and lakes), over regional to global scales, with accuracy and with respect to the center of mass of the Earth. Altimetry system’s responses have to be continuously monitored for their quality, biases, errors, drifts, etc. with calibration. Absolute calibration of altimeters is achieved by external and independent to satellite facilities on the ground. This is the mainstay for a continuous, homogenous, and reliable monitoring of the earth and its oceans. This paper describes the development of the Permanent Facility for Altimetry Calibration in Gavdos/Crete, Greece, as of 2001 along with its infrastructure and instrumentation. Calibration results are presented for the reference missions of Jason-1, Jason-2, and Jason-3. Then, this work continues with the determination of relative calibrations with respect to reference missions for Sentinel-3A, HY-2...
Sea-Level Analysis Using 100 Days of Reflected GNSS Signals
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Global Navigation Satellite System (GNSS) signals reflected off the sea surface can be used for remote sensing of the sea level. We present results from a GNSS-based tide gauge using standard geodetic-type GNSS receivers for receiving both the reflected and the direct GNSS signals. The local sea level is then obtained using relative geodetic processing of the carrier phase delay. We show results from our analysis of 100 days of GNSS data from the Onsala Space Observatory (OSO). The GNSS-derived sea level is compared to a weighted average of sea level observations from two stilling well gauges located 18 km and 33 km away from OSO. The comparison shows a high level of agreement with a correlation coefficient of 0.96. Furthermore, the standard deviation (1σ) between the time series is 5.0 cm and the pairwise mean difference is 3.6 cm. Additionally, we present a tidal analysis of the three sea level datasets and compare the derived tidal constituents both to each other and to a Regiona...