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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, 2025, V. 22, No. 3, pp. 225-234

Study of characteristics of mesoscale variability of the Pacific Ocean in the area of South Kuril and Hokkaido islands based on satellite altimetry data

A.A. Romanov 1 , A.A. Romanov 1 
1 AO Central Research Institute for Machine Building, Korolev, Moscow Region, Russia
Accepted: 26.02.2025
DOI: 10.21046/2070-7401-2025-22-3-225-234
This study continues a series of works focusing on parameters of mesoscale variability (characteristic spatial and temporal scales) of sea surface height anomalies in the Far Eastern Pacific Ocean derived from satellite altimetry data. A region was chosen east of the islands of the Small Kuril Ridge (Kunashir and Iturup) and southeast of the Hokkaido Island, characterized by the presence of quasi-stationary vortex formations observed in satellite images of the sea surface in various ranges of the electromagnetic spectrum: near UV, visible, IR and microwave ranges. In the selected region, based on IMMOAD (Integrated Multi-Mission Ocean Altimeter Data for Climate Research) v5.1 satellite altimetry data, which represent sea surface height anomalies over the entire history of altimetry observations within the TOPEX/Poseidon (Topographic Experiment/Poseidon) and Jason-1, -2, -3 missions, a multidimensional autocorrelation function was constructed in spatial and temporal dimensions. To assess the characteristics of variability, the constructed autocorrelation function was approximated by a multidimensional (spatial-temporal) Gaussian function. It was shown that in this region there is a pronounced mesoscale dynamics of the sea surface with characteristic spatial radii of about 90 km and a lifetime of about 80 days. No pronounced transfer of sea surface height anomaly heterogeneities, characteristic of the open part of the Pacific Ocean, could be identified.
Keywords: satellite altimetry, statistics, autocorrelation function, mesoscale variability
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