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Spectral Analysis of Satellite Altimeter and Tide Gauge Data around the Northern Australian Coast

1
School of Civil Engineering and Surveying, University of Southern Queensland, 37 Sinnathamby Blvd, Springfield Central, QLD 4300, Australia
2
School of Engineering, The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(1), 161; https://doi.org/10.3390/rs12010161
Received: 5 November 2019 / Revised: 27 December 2019 / Accepted: 27 December 2019 / Published: 2 January 2020
(This article belongs to the Section Ocean Remote Sensing)
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. View Full-Text
Keywords: ocean tide models; satellite altimetry; spectral analysis; tide gauge; north of Australia; tidal analysis ocean tide models; satellite altimetry; spectral analysis; tide gauge; north of Australia; tidal analysis
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MDPI and ACS Style

Gharineiat, Z.; Deng, X. Spectral Analysis of Satellite Altimeter and Tide Gauge Data around the Northern Australian Coast. Remote Sens. 2020, 12, 161. https://doi.org/10.3390/rs12010161

AMA Style

Gharineiat Z, Deng X. Spectral Analysis of Satellite Altimeter and Tide Gauge Data around the Northern Australian Coast. Remote Sensing. 2020; 12(1):161. https://doi.org/10.3390/rs12010161

Chicago/Turabian Style

Gharineiat, Zahra, and Xiaoli Deng. 2020. "Spectral Analysis of Satellite Altimeter and Tide Gauge Data around the Northern Australian Coast" Remote Sensing 12, no. 1: 161. https://doi.org/10.3390/rs12010161

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