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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, 2014, Vol. 11, No. 1, pp. 163-181

Interannual sea current variability in the Japan and Okhotsk seas based on satellite data

D.K. Staritsyn1 , P.V. Lobanova1 
1 Saint-Petersburg State University, Saint-Petersburg, Russia
Up-to-date progress in satellite altimetry opens new possibilities in getting information about variability of sea currents in wide spectrum of space and temporal scales. However, there is a variety of poorly investigated key issues for understanding the mechanisms of energy-carrying processes at different scales of non-periodic current variability.
The problem of typical space and temporal scales at which energy supplying of the Ocean occurs has not been solved yet. In addition, the mechanism of wave processes influence on formation of current speed fields and fields of masses is not evident. These and other problems hamper correct setting up, processing and analysis of remote sensing data, particularly, when there is a choice of space and temporal scales of averaging of the data and its comparison with in-situ measurements.
In the research we estimated interannual variability of non-periodical currents in both seas in 1993-2010 using satellite information. Applying spectra (Fourier) analysis, we pointed out the main energy-carrying fluctuations with periods of 5-6 years, 2-3 years, 1 year and half a year. In addition, we calculated the amplitude and contribution of each mentioned fluctuation to the total variability of the non-periodical currents and showed that in spite of the annual fluctuations, 5-6 year fluctuations also brought in an essential contribution. However, the main energy of currents is essentially concentrated on seasonal frequencies. We make a hypothesis that significant seasonal variations of non-periodic currents in investigated seas depend on dynamic processes due to the low-frequency gradient-eddy waves, which are caused by wind stress and gradient of atmosphere pressure.
Keywords: satellite data, spectral analysis, current dynamic.
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