Spectral Analysis of Satellite Altimeters and Tide Gauges Data around the Northern Australian Coast
Article
Article Title | Spectral Analysis of Satellite Altimeters and Tide Gauges Data around the Northern Australian Coast |
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ERA Journal ID | 201448 |
Article Category | Article |
Authors | Gharineiat, Zahra (Author) and Deng, Xiaoli (Author) |
Journal Title | Remote Sensing |
Journal Citation | 12 (1), pp. 1-15 |
Number of Pages | 15 |
Year | 2020 |
Publisher | MDPI AG |
Place of Publication | Switzerland |
ISSN | 2072-4292 |
Digital Object Identifier (DOI) | https://doi.org/10.3390/rs12010161 |
Web Address (URL) | https://www.mdpi.com/2072-4292/12/1/161 |
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. |
Keywords | ocean tide models; satellite altimetry; spectral analysis; tide gauge; north of Australia; tidal analysis |
ANZSRC Field of Research 2020 | 370699. Geophysics not elsewhere classified |
370803. Physical oceanography | |
490105. Dynamical systems in applications | |
Byline Affiliations | School of Civil Engineering and Surveying |
University of Newcastle | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5841/spectral-analysis-of-satellite-altimeters-and-tide-gauges-data-around-the-northern-australian-coast
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