Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 5, pp. 101-113
Nonstationarity and spatial inhomogeneity of large-scale sea level perturbations in the Baltic Sea from satellite altimetry measurements
D.K. Staritsyn
1 , V.R. Foux
1 1 Saint Petersburg State University, Saint Petersburg, Russia
Accepted: 12.07.2016
DOI: 10.21046/2070-7401-2016-13-5-101-113
The study is based on data from satellite altimetry sea level measurement over the Baltic Sea. The major ranges of large-scale sea level variability are determined. Amplitudes of the resolved components and their contributions to the total variance of the sea level oscillation are estimated. It is found that the interannual sea level oscillation has maximal amplitude in the Finland, Bothnian and Riga Bays. It is proved that in addition to the 1-year steric constituent oscillation and the 6 to 7-year eustatic one, the large-scale sea level perturbation contains standing waves of the ½- and 2-to-3-year periodicity. Wavelet analysis reveals that oscillation of the sea level is energy-supplied mostly due to nonlinear energy transfer. The resolved sea-level oscillations are shown to be considerably modulated in amplitude within the Baltic Sea. Frequency modulation appears in separate years in the ½- and 2 to 3-year periods.
Keywords:
Baltic Sea, altimetry, sea-level oscillation, standing waves, energy flows, wavelet analysis, amplitude modulation
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