Spectral Analysis of Satellite Altimeters and Tide Gauges Data around the Northern Australian Coast

Gharineiat, Zahra and Deng, Xiaoli (2020) Spectral Analysis of Satellite Altimeters and Tide Gauges Data around the Northern Australian Coast. Remote Sensing, 12 (1). pp. 1-15.

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Abstract

The north of Australia is known for its complex tidal system, where the highest astronomical tides (HATs) reach 12 m. This paper investigates the tidal behaviour in this region by developing spectral climatology for tide gauge and altimetry data. Power spectral density analysis is applied to detect the magnitude of ocean tides in 20 years of sea-level data from multimission satellite altimeters and tide gauges. The spectra of altimetry sea level anomaly (SLA) time series have their strongest peaks centred at approximately 2.11, 5.88, and 7.99 cycles per year (cpy), corresponding to the diurnal and semidiurnal tidal constituents K1, M2, and O1, respectively. Closer to the coastline, the spectra peak at high-frequency overtide and shallow-water constituents such as M4, MK4, and MK3. There have been many large, high-frequency spectral peaks near the coastline, indicating the difficulty of predicting tidal signals by coastal altimetry. Similar to altimetry observations, there are dominant semidiurnal and diurnal tidal peaks in tide gauge SLA time series accompanying a number of overtides. The semidiurnal and diurnal peaks are mostly higher on the northwest coast of Australia compared with the north and northeast coast. The results from both altimetry and tide gauges indicate that tidal range increases with increasing continental shelf.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Date Deposited: 30 Jan 2020 05:29
Last Modified: 08 May 2020 01:43
Uncontrolled Keywords: ocean tide models; satellite altimetry; spectral analysis; tide gauge; north of Australia; tidal analysis
Fields of Research : 04 Earth Sciences > 0404 Geophysics > 040499 Geophysics not elsewhere classified
04 Earth Sciences > 0405 Oceanography > 040503 Physical Oceanography
01 Mathematical Sciences > 0102 Applied Mathematics > 010204 Dynamical Systems in Applications
Identification Number or DOI: https://doi.org/10.3390/rs12010161
URI: http://eprints.usq.edu.au/id/eprint/37629

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