The Impact of Fortnightly Stratification Variability on the Generation of Baroclinic Tides in the Luzon Strait

Journal of Marine Science and Engineering

卷:9

Thomas Pohlmann¹  Xueen Chen²  Zheen Zhang² 

[1] Centre for Earth System Research and Sustainability, Institute of Oceanography, University of Hamburg, 20146 Hamburg, Germany;

[2] College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;

关键词: Luzon Strait;    baroclinic tides;    stratification variability;    MITgcm;   

DOI  :  10.3390/jmse9070703

来源: DOAJ

【 摘 要 】

The impact of fortnightly stratification variability induced by tide–topography interaction on the generation of baroclinic tides in the Luzon Strait is numerically investigated using the MIT general circulation model. The simulation shows that advection of buoyancy by baroclinic flows results in daily oscillations and a fortnightly variability in the stratification at the main generation site of internal tides. As the stratification for the whole Luzon Strait is periodically redistributed by these flows, the energy analysis indicates that the fortnightly stratification variability can significantly affect the energy transfer between barotropic and baroclinic tides. Due to this effect on stratification variability by the baroclinic flows, the phases of baroclinic potential energy variability do not match the phase of barotropic forcing in the fortnight time scale. This phenomenon leads to the fact that the maximum baroclinic tides may not be generated during the maximum barotropic forcing. Therefore, a significant impact of stratification variability on the generation of baroclinic tides is demonstrated by our modeling study, which suggests a lead–lag relation between barotropic tidal forcing and maximum baroclinic response in the Luzon Strait within the fortnightly tidal cycle.

【 授权许可】

Unknown