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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, 2023, Vol. 20, No. 1, pp. 205-218

Estimation of inertial frequency shifts in the central Japan Sea from surface drifter data

O.O. Trusenkova 1 , V.B. Lobanov 1 , S.Yu. Ladychenko 1 
1 V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
Accepted: 22.12.2022
DOI: 10.21046/2070-7401-2023-20-1-205-218
Using wavelet rotary spectra, inertial oscillations of two surface drifters in the central Japan Sea in October and November 2011 were analyzed and significant frequency (period) shifts from the local inertial frequencies (periods) were found. When the buoys drifted under the wind forcing, the 0.5–1 hour shifts were the most frequent, with the period either increased or decreased. When the buoys drifted with currents, the shifts reached 1.5–5.7 hours, which can be related to the background relative vorticity (Kunze, 1985). Using Kunze’s formula, the corresponding Rossby numbers along the drift trajectory were estimated as 0.15–0.5. There is a qualitative agreement with vorticity estimated from satellite altimetry for large mesoscale eddies, with the sizes of 100 km and more, although vorticity estimated from the buoys is several times stronger. As for submesoscale dynamic structures, with the sizes less than 50 km, the buoy and altimetry vorticity estimates can have different signs but the buoy-based estimates are confirmed by infrared satellite imagery.
Keywords: Japan Sea, surface buoy, drift, satellite altimetry, infrared imagery, wavelet transform, rotary spectrum, inertial oscillations, relative vorticity, Rossby number
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