ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 6, pp. 248-264

Calibration of significant waves height altimetric measurements by wave reanalysis

S.A. Lebedev 1, 2, 3 , I.V. Gusev 1, 4 
1 Geophysical Center RAS, Moscow, Russia
2 National Research University of Electronic Technology, Zelenograd, Moscow, Russia
3 Maykop State Technological University, Maykop, Russia
4 AO Central Research Institute for Machine Building, Korolev, Moscow Region, Russia
Accepted: 05.12.2022
DOI: 10.21046/2070-7401-2022-19-6-248-264
At present, a technology has been developed for calibrating data from altimetry measurements of the sea surface height both at stationary and temporary calibration sites, equipped with modern technology for in situ sea level measurements. It is currently difficult to calibrate significant wave height (SWH) obtained from satellite altimetry data at the sea surface height measurement calibration sites, since most of them are located near the coastline. For this reason, SWH calibration is carried out on fixed wave buoys located in the open ocean. In the Black Sea, where the calibration site for altimetry measurements of the Russian space geodetic system Geo-IK-2 is located, it is difficult to calibrate SWH, since there are no measurements by stationary wave-gauging buoys in its water area, and episodic in situ measurements do not allow high-quality calibration. For this reason, in this paper, we propose a method for calibrating SWH based on wave field reanalysis data. The SWH calculated using the BLKSEA_ MULTIYEAR_WAV_007_006 model was compared with the results of altimetry measurements of 14 satellites for the time interval 1985–2021. The correlation analysis of the results showed a good agreement between the remote sensing data and model calculations, which made it possible to calibrate the altimetry measurements of the Russian Geo-IK-2 satellites No. 12 and No. 13 according to wave reanalysis data. For them, the correlation coefficient was 0.943 and 0.940, respectively, and the determination coefficient was 0.997 and 0.999. Measurements of a sea buoy with a GNSS receiver, which was located on October 19, 2021, near one of the altimetry tracks of the Geo-IK-2 satellite No. 13, showed good agreement between SWH in situ measurements (0.576 m) and altimetry measurements (0.521 m) and model calculations (0.599 m). Thus, it is shown that SWH calculated from altimetry measurements correspond to a measurement accuracy of less than 10 %.
Keywords: satellite altimetry, calibration range, space geodetic system, significant wave height, wave reanalysis
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