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      Seasonal Variability of Internal Tides Northeast of Taiwan

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          The spatial-temporal characteristics of the barotropic tides and internal tides (ITs) northeast of Taiwan Island are examined, based on a 1-year mooring current observations from May 23, 2017 to May 19, 2018. The results of harmonic tidal analysis show that the barotropic tides are dominated by semidiurnal tides, which is mainly controlled by M 2 tidal components. Moreover, the vertical structures of diurnal and semidiurnal ITs show that the semidiurnal IT shows notable seasonal variation, whereas seasonal variations of the diurnal IT energy is not significant. The semidiurnal IT energy in winter half year is twice that in summer half year. The seasonal variation of semidiurnal IT is mainly modulated by the direction change of the current rather than by the topographic features and stratification. In summer (winter) half year cyclonic (anti-cyclonic) eddies meanly control at this point, so the flow direction is mainly in the southwest (northeast) direction, causing the background flow to flow along (perpendicular to) the isobath. When crossing the isobath, the ITs are generated by the interaction of the barotropic tide and the topography, resulting in the increase of the tidal energy in the winter half year.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          02 May 2020
          01 June 2020
          : 19
          : 3
          : 740-746
          1The Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
          2University of the Chinese Academy of Sciences, Beijing 100049, China
          3Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
          4Pilot National Laboratory for Marine Science and Technology (Qingdao), Laboratory for Ocean and Climate Dynamics; Chinese Academy of Sciences, Center for Ocean Mega-Science, Qingdao 266000, China
          5First Institute of Oceanography (FIO), Ministry of Natural Resources (MNR) of China, Qingdao 266100, China
          6College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
          Author notes
          *Corresponding author: HOU Yijun, E-mail: yjhou@ ; LIU Ze, E-mail: liuze@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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