| 摘要: |
| 本研究通过对东山岛外海浮标观测的表层水温(SST)数据进行分析，发现2016、2017年夏季东山岛外海表层水温均存在周期为5~8 d的亚潮频波动信号，最大振幅分别为3.1 ℃和2.1 ℃。结合卫星遥感SST数据以及风场数据，采用小波分析、交叉小波分析等方法对该现象进行研究分析，结果表明：2016年夏季表层水温中出现的亚潮频波动信号源自短波辐射，表层水温变化滞后短波辐射1天左右；2017年夏季的亚潮频波动源自沿岸风应力，表层水温变化滞后沿岸风应力2天左右。2016年和2017年表层水温出现的亚潮频波动均与台风有关，但信号的来源出现差异是因为2017年台风过境引起了较强的沿岸风松弛现象，在沿岸风中出现了亚潮频波动信号，沿岸风影响上升流变化，进而引起表层水温的变化；2016年由于台风过境引起的沿岸风松弛现象较弱，沿岸风中并未出现亚潮频波动信号，而表层水温中的亚潮频波动信号源自短波辐射，这可能与台风引起局地天气系统的变化有关。 |
| 关键词: 海洋水文学 表层水温 亚潮频波动 上升流 东山岛 |
| DOI：10.3969/J.ISSN.2095-4972.20221018002 |
|
| 基金项目:国家自然科学基金(42130406)；自然资源部第三海洋研究所基本科研业务费［海三科 2022013,海三科2019018, HE01-190702(10)］ |
|
| Subtidal variability of sea surface temperature off Dongshan Island |
| LI Kai,JIA Cun,CHEN Jianqiao,XU Jindian,CAI Shangzhan |
| (Third Institute of Oceanography, MNR, Xiamen 361005, China;Fujian Provincial Key Laboratory of Marine Physical and Geological Processes, Xiamen 361005, China;Fujian Marine Forecasts, Fuzhou 350003, China) |
| Abstract: |
| According to the sea surface temperature (SST) data observed by mooring buoys, we found subtidal variability signals in a period of 5-8 days off Dongshan Island in summer of 2016 and 2017, and the maximum amplitude was respectively 3.05 ℃ and 2.13 ℃. Combining with data of remote sensing SST, wind, OA Flux, and methodology of wavelet analysis, cross wavelet analysis, the analyse results that the subtidal variability signal in SST is respectively derived from shortwave radiation and coastal wind stress in summers of 2016 and 2017. The SST variation lags shortwave radiation for 1 day, and lags coastal wind stress for 2 days. Further study shows that the subtidal variability signals in 2016 and 2017 were both related to typhoons. The reason for different signal source was the intense coastal wind relaxation phenomena caused by typhoon in 2017 and it generated subtidal variability signal in coastal wind which influences the upwelling and SST. When the coastal wind relaxation phenomena was very weak in 2016, there was no subtidal variability signal in coastal wind. The mechanism of subtidal variability signal in SST in 2016 derived from shortwave radiation may be related to the change of local weather system caused by typhoon. |
| Key words: marine hydrology SST subtidal variability upwelling Dongshan Island |
