High-frequency sea-level analysis: global distributions

Zemunik, Petra; Denamiel, Cléa; Šepić, Jadranka; Vilibić, Ivica (2022) High-frequency sea-level analysis: global distributions. Global and Planetary Change, 210 . ISSN 0921-8181

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Abstract

This paper provides global climatology of high-frequency (T < 2 h) sea-level oscillations of atmospheric origin. Sea-level series with a temporal resolution of 1 min from 331 tide gauges in the world ocean and spanning between 1.5 and 12 years were analysed to determine the typical ranges, seasons and characteristics of moderate and extreme manifestations of nonseismic sea-level oscillations at tsunami timescales (NSLOTTs). Variances in these oscillations reach 6.6 cm(2) on average, but their region-averaged extreme (99.99th percentile) ranges may exceed half a metre or more at individual hotspot locations. The NSLOTTs are the highest in the mid-latitudes and decrease towards polar and tropical regions. Moderate oscillations show clear winter maxima at the ma-jority of stations, while a less pronounced pattern is evident for the most extreme oscillations, which may occur throughout a year. A total of 3080 of the most prominent NSLOTT events were selected from 308 stations and compared to background oscillations, revealing the substantial capability of energy amplification during extreme events. Synchronicity in extreme NSLOTT events between neighbouring stations (up to 250 km) in mid-latitudes has been detected for 20-32% of all episodes, suggesting possible connectivity between the episodes.

Item Type:	Article
Uncontrolled Keywords:	high-frequency sea level ; tide-gauge records ; atmosphere-ocean interaction ; meteotsunami
Subjects:	NATURAL SCIENCES > Geophysics
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Višegodišnje i dekadne oscilacije Jadranskog mora: opažanja, modeliranje i posljedice-ADIOS Ivica Vilibić; Darko Koračin; Jadranka Šepić IP-2016-06-1955 HRZZ Procjena doprinosa oscilacija razine mora perioda kraćeg od jednog sata ukupnim ekstremima razine mora u promjenjivim klimatskim uvjetima-SHExtreme Jadranka Šepić; Slavko Radilović 853045 EK
Depositing User:	Martina Žugaj
Date Deposited:	24 Mar 2026 12:39
URI:	http://fulir.irb.hr/id/eprint/11441
DOI:	10.1016/j.gloplacha.2022.103775

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