台湾东北海域龟山岛海底热液原位观测数据周期性的小波分析

龟山岛（Kueishantao Islet）是中国海域目前唯一已知的海底热泉密集分布区.2011年5月，由浙江大学、杭州电子科技大学和台湾中山大学师生组成的研究小组，对龟山岛海域海底热液地区进行了联合海上作业，自制温度传感器于5月25日放置在水深约16.7 m的白色热泉口（坐标：24.83419N；121.96198E），5月30日收回.对此次海上作业取得的水压和水温原位观测数据进行平滑处理后，采用Morlet小波变换进行分析，求出水压和水温的小波系数，得到其随时间变化的规律.结果反映出当地潮汐以半日潮为主；兼有全日潮的性质.温度的变化周期与水压的变化周期不尽一致，存在2.5 h的尺度差，可能由于热液喷发强度和海水涨落内因一致，即月球和太阳对地球的引力，但地内流体（热液）和地表流体（海水）对外引力的响应却不尽相同所致.

Wavelet analysis of in-situ observation data on its periodicity of hydrothermal vents on the seafloor of Kueishan Island

From May 25 to 30,2011,a joint research was taken on the hydrothermal vents on the seafloor of Kueishan Island,and a series of sensors were located at a White Spring vent(24.83419N;121.96198E),which lies close to Kueishan Island,to the northeast of Taiwan Island.In situ observation data were processed with Morlet Wavelet.Wavelet coefficients of temperature and pressure were calculated and variation periodicities of the two factors with time were extracted.The results showed that the characteristic of local tidal were both semi-diurnal periodicity and diurnal periodicity.The periodicity of temperature was inconsistent with the periodicity of pressure,which was explained as there had the same internal cause between strength of hydrothermal eruption and the fluctuation of sea water,but different response to the external gravitation of the hydrothermal and the sea water.