Overview of altimetric sea level data for the Kazakh part of the Caspian Sea

Abstract

This research paper analyzes satellite altimetry data for the northeastern and middle parts of the Caspian Sea for the period from 1993 to 2023. The verification of altimeter data from the data of marine hydrometeorological stations of nasal observations of the permanent sea at two points was carried out: M Peshnoy and MHP Fort Shevchenko. The results showed that the altimetric data have a high correlation with ground observations (0.89-0.94), with a mean absolute error ranging from 17 cm to 23 cm, and a consistency index above 0.7. The assessment of data applicability according to statistical criteria showed that there are minor deviations. Altimetric data are most accurate for monitoring water levels from April to October and can be used for monitoring sea levels in the open parts of the Caspian Sea.