Item

Abstract

Recently, sea-level variations for the last 66 Ma has been derived by Miller et al. (2020). The sea level jumps in Oligocene and Early Miocene are determined by means of high-sensitive Method of Jump Detection (MJD). This Method is able to discover very small jumps, whose level is below the random noise, due to the property of selective frequency filtration during time series integration, when the high-frequency noise is suppressed and low-frequency signals are amplified. In previous research sea-level jumps for the last 13.8 Ma have been determined, so the sea-level data between 13.8 – 33.9 Ma are analyzed by the MJD. The detected jumps separate data into several segments whose duration is between 300 ka and 2 Ma. The instant data jumps are below 16 m, while the rates of linear trends between the jumps are relatively small with maximal values below 2.5 cm/ka. The sea level and corresponding temperature jumps occur during the maxima or minima of Earth orbit eccentricity. This result points out to the strong orbital influence on past climate change.