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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, 2021, Vol. 18, No. 5, pp. 181-192

Estimation of internal wave phase speed in the Arctic Ocean from sequential spaceborne SAR observations

I.E. Kozlov 1 , T.V. Mikhaylichenko 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 16.08.2021
DOI: 10.21046/2070-7401-2021-18-5-181-192
Here we present direct estimates of phase speeds of short-period internal waves (SIWs) in the Arctic Ocean obtained from the analysis of sequential Sentinel 1A/B SAR images. Analysis of data near Svalbard in June-September 2018 has shown a peak in SIW observations in August. Three key regions of SIW generation were identified: deep Fram Strait, southern and central parts of Yermak Plateau and shelf regions north-west of Svalbard. Maximal SIW phase speed values are found over the Yermak Plateau and attain 0.84 m/s. Over Fram Strait and on the Svalbard shelf, phase speed values are similar with mean value about 0.2–0.3±0.03 m/s. Obtained phase speeds are higher than maximal tidal currents over all three SIWs’ observation sites, confirming their tidal generation and free propagation at subcritical Froude numbers. Comparison of satellite-based phase speed estimates with theoretical values obtained using two-layer model and actual hydrological data has shown good correspondence for the cases when the time lag between satellite and field data was not exceeding one day.
Keywords: short-period internal waves, phase speed of internal waves, tidal currents, satellite radar images of the ocean surface, Fram Strait, Svalbard, Yermak Plateau, Arctic Ocean
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