Kinematic characteristics of internal waves in the central Atlantic investigation according to CTD-profiling data
UDC
551.466Abstract
Internal waves' kinematic characteristics depend strongly on the vertical structure of the upper ocean layer's density. In this paper, the results of the hydrophysical fields' characteristics' measurements calculated from the CTD-data obtained in the 36 cruise of the "Akademik Sergey Vavilov" research vessel in October-November 2012 are presented. The mathematical formulation of the problem is reduced to the solution of the homogeneous boundary value problem, which is solved as a problem of the modal analysis. The most significant anomalous changes in the behavior of the dispersion curves were observed in the area of the polygon "Kane pass". The comparison of results of numerical calculations of the internal waves' kinematic characteristics with the data of the ocean surface radar sensing was conducted at this polygon. The σ, k values found by the radar sensing practically coincide with the coordinates of the point on the dispersion curve corresponding to the internal waves' first mode (relative error is 0.8 %). Thus we can draw a conclusion that the internal waves were recorded at the investigated polygon by detecting their surface exposure and the radar is an effective tool of their remote detection. The depth of the picnocline in the area of the polygon "pass Kane" was analytically determined within the framework of two-layer model of the linear theory of internal waves, based on the use of the ocean surface radar sensing and the average seasonal values of the density drop. At the comparison of the CTD-measurements with the radar data, relative error was 14 %. Similar analytical investigation based only on the results of visual observation of slicks on the ocean surface and the Beaufort scale were held 14/11/12 in the area of the polygon “channel Vema”. A comparison of analytically deduced theoretical estimates of the thickness of the upper stratified layer with the CTD-data showed a rather good result, for the certain situation, (error does not exceed 15 %).
Keywords:
internal waves, vertical CTD-profiling, density stratification models, internal waves dynamics boundary problems, dispersion curves, slicks, radar stationsReferences
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