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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 5, pp. 36-46

Determination of the main parameters of the temporal autocorrelation function of surface level anomalies at some points in the Far Eastern Pacific Ocean

A.A. Romanov 1 , A.A. Romanov 1, G.V. Shevchenko 2 
1 AO Central Research Institute for Machine Building, Korolev, Moscow Region, Russia
2 Russian Federal Research Institute of Fisheries and Oceanography, Sakhalin Branch, Yuzhno-Sakhalinsk, Russia
Accepted: 12.10.2024
DOI: 10.21046/2070-7401-2024-21-5-36-46
The main problem when using optimal interpolation approaches to reconstruct the fields of spatial distribution of sea surface height anomalies is the search for the main parameters and the type of spatiotemporal autocorrelation functions, which significantly depend on the studied water areas. The use of autocorrelation functions that describe statistics for the world ocean as a whole can lead to significant interpolation errors when reconstructing the spatial distributions of sea surface height anomalies from satellite altimetry data. A study of temporal correlation functions was carried out using data from the TOPEX/Poseidon and Jason 1/2/3 spacecrafts for several selected points of subsatellite tracks in the Pacific Ocean and adjacent seas. The values of the e-folding parameter of the autocorrelation function are presented for the Sea of Japan (150 days) and various parts of the Pacific Ocean, including areas of the North Pacific Current. It is shown that the corresponding values vary from 40 to 100 days, and the influence of the tidal component on the main parameters of the temporal autocorrelation function is considered. Time variability of sea surface height anomalies obtained from satellite data at selected points is analyzed, and some trends are shown. At all points considered, an increase in the values of the studied quantity by at least 20 cm over 30 years is observed.
Keywords: satellite altimetry, time correlation function, time variability statistical characteristics
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