Gorchakov V.A., Dvornikov A.Y., Gordeeva S.M., Ryabchenko V.A.

The following article provides the research on interannual temperature oscillations of the Barents Sea and the Kara Sea based on mode results only without using the reanalysis data in the water temperature distribution during the 1 to 12-year period. Model solution of 1975–2005 received according to the two different spatial resolution model data are used for the following research. The correct representation of the researched area climate by these models is determined. Interannual water temperature oscillations amplitude magnitude may be compared to the ones of the interseasonal oscillations in the researched area. The wavelet analysis method, providing the opportunity for the research of the periodical components despite their frequency changes, is used here to detect the periodicity and possible frequency instability. The analysis results demonstrate that the atmosphere temperature oscillations and ice cover area oscillations show the similar periods. It’s worth mentioning that some of the known oscillations in the Ocean-Atmosphere system match the oscillations intervals received according to model results. In the atmosphere temperature and the water temperature oscillation of the initial data distribution the connection between the oscillations range and the ice edge position can be followed clearly. In the water and air temperature oscillations in the local points the 3 basic supporting frequencies of the presented parameters are distinguished. They correspond to the 1.0–3.6 year, 3.9–5.8 year, 6.3–10.5 year periods as well as to the basic supporting oscillation periods at the “Kola meridian” stations. Ice cover area oscillation ranges are fully contained in the stated ranges of the 3 basic water and air temperature oscillations in the researched local points of the Barents Sea and the Kara Sea. The sea oscillation intensity depends on the ice edge position and is presented mostly in the areas which are covered by the snow during the less period of time. Two-dimensional distribution of the temperature oscillation amplitudes demonstrates that the high-frequent oscillations (periods lasting up to 4.1 year) get the more evident vision on the surface and are poorly presented in the low layers. On the contrary the long period (lasting more than 8 years) oscillations appear nearly everywhere. In the low layers such oscillations can spread especially wide including the distance up to the north end of the researched area.

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