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Rapid growth waves in the Open Ocean off Dongjidao
|Authors: ||Lin, Yu-Fen|
Dongjidao;Rapid growth waves;Significant wave height;Continental cold high pressure;Meteorological fronts;Typhoons
|Issue Date: ||2018-05-16T08:49:37Z
The study utilized the wave and meteorological information recorded by the Dongjidao Wave Buoy and weather stations of the Central Weather Bureau to find the rapid growth wave events. The waves were recorded three times per hour (20-minute long each time), while the meteorological information was recorded once per hour. In this study, the rapid growth waves were defined as those waves with significant wave height grew more than two times in 6 hours and higher than 1.5 m as well. Our results indicated that there were 277 rapid growth wave events occurred between 2013 and 2015. We found that most rapid growth waves around Dongjidao occurred in the fall and winter. The weather systems associated with these rapid growth wave events were (in the descending frequency order): continental cold high pressures, typhoons or tropical depressions, meteorological fronts with continental cold pressure, and typhoons or tropical depressions. When the rapid growth waves occurred, the wind direction around the Dongjidao was mostly from the north or the north of northeast. We also compared the rapid growth wave events found in Penghu and Hsiao Liouciou Island waters. Since these latter two wave stations recorded waves once in an hour, we also examine the rapid wave growth events in Dongjidao by taking one record in each hour. It was found that on average Dongjidao had 68 events in one year, Penghu waters had 82, and Hsiao Liouciou Island 13. However, using three records per hour data obtained in Dongiidao, its yearly number of events were 92. Apparently the higher number of events was due to the continuous instead of once per hour observation of waves. As for associated weather systems, the Dongjidao and Penghu waters were mostly caused by continental cold high pressure systems, while HsiaoLiouciou Island waters were mostly by typhoons or tropical depressions.
|Appears in Collections:||[海洋環境資訊系] 博碩士論文|
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