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Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
Coupling of sea level and tidal range changes, with implications for future water levels
Adam T Devlin1,2, David A Jay3, Stefan A Talke3
1The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, SAR, China. phlux1@gmail.com.
Ocean tide changes are linked to sea-level fluctuations, impacting high water levels. Some areas experience amplified flood risks due to these non-linear tidal shifts.
Area of Science:
- Oceanography
- Climate Science
- Coastal Studies
Background:
- Rising global sea levels pose increasing risks to coastal communities.
- Understanding factors influencing extreme sea-level events is crucial for adaptation.
Purpose of the Study:
- To investigate the correlation between ocean tide variations and sea-level changes.
- To assess the impact of these variations on high water levels and coastal flood risk.
Main Methods:
- Statistical analysis of 152 tide gauge records from the Pacific Ocean and South China Sea.
- Evaluation of the highest astronomical tide (HAT) changes over seasonal and interannual scales.
- Probability density function (PDF) analysis of total sea level (TSL) exceedances at selected stations.
Main Results:
- Significant correlation found between highest astronomical tide (HAT) variability and sea-level variability.
- Approximately 35% of stations showed tidal changes exceeding ±50 mm per meter of sea-level fluctuation.
- Tidal amplification in some regions, like Hong Kong, exacerbates sea-level rise flood risk.
Conclusions:
- Ocean tide perturbations are significantly correlated with sea-level changes.
- Tidal variations can non-linearly amplify or mitigate coastal flood risks.
- Local flood level assessments must integrate non-stationary tides and mean sea level (MSL).
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