Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 5, pp. 114-120
Spectral and wavelet analysis of the Japan/East Sea level anomalies
1 N.N. Zubov State Oceanographic Institute, Saint Petersburg, Russia
Accepted: 29.09.2016
DOI: 10.21046/2070-7401-2016-13-5-114-120
In this paper, low-frequency oscillations of the Japan/East Sea level anomalies during 1992–2012 are investigated based on satellite altimetry data. Spectral analysis highlighted main fluctuation periods: 4, 2.5, 1 and 0.5 years. Meanwhile, wavelet analysis revealed a significant level of non-stationarity. The presence of non-linear energy fluxes between the oscillations of different frequencies is associated with the so-called "Kolmogorov cascade mechanism" from the large-scale to the small-scale movements, as well as with the phenomenon of "negative viscosity" in case of fluxes of the opposite direction. As the development of hypothesis on the wave nature of the low-frequency level oscillations of the Japan/East Sea, directed frequency spectral analysis has been applied to the altimetry data time series. The method allowed estimation of the low-frequency waves parameters on the annual scale and their propagation direction, defining them as the planetary waves and also showed complex spatial structure. These results are consistent with the hypothesis suggested earlier in (Zvereva, Foux, 2014, 2016) on the propagation of the standing-progressive planetary waves in the Japan/East Sea, which can be represented by the system of the nodal lines and Rossby waves propagating westward between them.
Keywords: Rossby waves, altimetry, standing-progressive waves, Japan/ East Sea, spectral analysis, directed frequency spectrum
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