Internal Tides Reverse Tidal Currents Around Southern Taiwan
Journal
Journal of Geophysical Research: Oceans
Journal Volume
129
Journal Issue
8
ISSN
2169-9275
2169-9291
Date Issued
2024-08
Author(s)
Abstract
We present a highly unusual case in southern Taiwan where internal tides (ITs) completely reverse the barotropic currents. A 3D baroclinic model is first validated and confirms the unexpected tidal current in that area. A series of sensitivity simulations are then used to progressively reveal the exact cause. Contrary to popular belief, a large canyon in that area is not responsible for the flow reversal. Results from using a relaxation technique in the model together with an energy flux analysis indicate that the energy of the large ITs emanated from the Luzon Strait is converted to the barotropic energy near the steep slope, which generates a local circulation and reverses the tidal flow there.
Subjects
baroclinic model
internal tide
reverse tidal current
SDGs
Publisher
American Geophysical Union (AGU)
Type
journal article