Годовой ход погрешности радиоальтиметрических измерений уровня Черного моря, обусловленной нелинейностью морских волн.

Abstract

The variability of the error of the altimetric determination of the Black Sea level L due to the nonlinearity of sea waves is analyzed. The nonlinearity leads to deviations in the distribution of elevations of the reflecting radio wave surface from the Gaussian distribution. The error occurs due to the fact that the median of the non-Gaussian distribution of surface elevations does not coincide with the average surface level. The analysis is carried out within the framework of the Brown model, which describes the shape of an altimetric pulse reflected from the sea surface. Data from a numerical operational model of the surface wave field are used for the analysis. When calculating the shape of the reflected pulse of the altimeter, an additional predictor is introduced – the steepness of the waves. It is shown that there is a clearly defined annual variation of the error L. Its highest values are observed in winter, when the average monthly value reaches the level of 0.25 m, in summer this error decreases to 0.08-01 m. The maximum value calculated from the three-hour characteristics of surface waves is 0.4 m, the average value is 0.17 m.