Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 7, pp. 163-174
Application of satellite altimetry data for analysis of peculiarities in synoptic sea-level perturbations forced by wind stress in the Baltic Sea – the North Sea system
E.A. Zakharchuk
1, 2 , V.N. Sukhachev
1, 2 1 St. Petersburg State University, Saint Petersburg, Russia
2 N.N. Zubov State Oceanographic Institute, St. Petersburg Branch, Saint Petersburg, Russia
Accepted: 22.10.2018
DOI: 10.21046/2070-7401-2018-15-7-163-174
Based on a joint statistical analysis of satellite altimetry information and meteorological field reanalysis data, the features of generation of low-frequency sea level disturbances in the system of the Baltic and North Seas under the action of tangential wind stress are estimated. The results indicate that there is no stationary relationship between these hydrometeorological processes in the Baltic Sea. Taking into account the nonstationarity of processes during the conduct of cross-correlation analysis shows that in most of the Baltic Sea regions the frequency of repetition of periods of high correlation between the wind stress and low-frequency sea level oscillations of the synoptic range of variability is close to zero and only in localized areas of the southwestern and southeastern part of the sea this frequency can reach 20–50 %. It is shown that, in comparison with the Baltic Sea, more favorable conditions are created in the North Sea for the generation of low-frequency wave sea-level oscillations under the action of wind stress: the coefficients of cross-correlation estimated in the stationary approximation are noticeably higher here. Accounting for non-stationarity of processes reveals a significant heterogeneity in the distribution of estimates of correlation coefficients: in the east-south-east of the North Sea, as well as in localized areas of the central, northern and north-western parts of the sea, the frequency of occurrences of high correlation reaches 80–92 %, while in the southwest and northeast of the North Sea, there are water areas where the frequency of occurrences of high correlation does not exceed 5–10 %.
Keywords: Baltic Sea, North Sea, satellite altimetry, sea level, wind stress, cross-correlation analysis
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