An Analysis of the 8.85- and 4.42-Year Cycles in the Gulf of Maine
In the background of global warming and climate change, nuisance flooding is only caused by astronomical tides, which could be modulated by the nodal cycle. Therefore, much attention should be paid to the variation in the amplitude of the nodal cycle. In this paper, we utilize the enhanced harmonic...
| Published in: | Journal of Marine Science and Engineering |
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| Main Authors: | , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
MDPI AG
2021
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| Subjects: | |
| Online Access: | https://doi.org/10.3390/jmse9121362 https://doaj.org/article/45a6a8d1a58042909f597710499a877b |
| Summary: | In the background of global warming and climate change, nuisance flooding is only caused by astronomical tides, which could be modulated by the nodal cycle. Therefore, much attention should be paid to the variation in the amplitude of the nodal cycle. In this paper, we utilize the enhanced harmonic analysis method and the independent point scheme to obtain the time-dependent amplitudes of the 8.85-year cycle of N 2 tide and the 4.42-year cycle of 2N 2 tide based on water level records of four tide gauges in the Gulf of Maine. Results indicate that the long-term trends of N 2 and 2N 2 tides vary spatially, which may be affected by the sea-level rise, coastal defenses, and other possible climate-related mechanisms. The comparison between Halifax and Eastport reveals that the topography greatly influences the amplitudes of those cycles. Moreover, a quasi 20-year oscillation is obvious in the 8.85-year cycle of N 2 tide. This oscillation probably relates to a 20-year mode in the North Atlantic Ocean. |
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