статья в журнале

Ru

Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa

ISSN:2070-7401
eSSN:2411-0280

2021

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. © 2021 Space Research Institute of the Russian Academy of Sciences. All rights reserved

Arctic Ocean, Fram Strait, Phase speed of internal waves, Satellite radar images of the ocean surface, Short-period internal waves, Svalbard, Tidal currents, Yermak Plateau

2021-12-17 11:12:24