A diagnostic model for TIW currents from SSH

Provide a diagnostic model code (.m, MATLAB) for high-frequency equatorial surface currents estimated from sea surface height (SSH). The model is based on a simplified shallow water equation, see Ref1 for details. The input and output data (.mat) are also provided. Inputs include the topography, low-pass background currents from OSCAR2, high-pass SSH. Outputs are high-frequency equatorial currents (u', v'). The results are used in a manuscript2 entitled "Intensification of Pacific Tropical Instability Waves over the recent three decades" recently accepted by Nature Climage Change.Wang, M., Xie, S. P., Shen, S. S., & Du, Y. (2020). Rossby and Yanai modes of tropical instability waves in the equatorial Pacific Ocean and a diagnostic model for surface currents. Journal of Physical Oceanography, 50(10), 3009-3024.Wang,M., S.-P. Xie, H. Sasak, M. Nonaka, and Y. Du, 2024: Intensification of Pacific Tropical lnstability Waves over the recent three decades. Nature Clim. Change, accepted