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This PR merges the feature/wec to the develop branch, which implements the Vortex Force formulation of Uchiyama et al. (2010), and has been added to the ROMS nonlinear kernel. It is based on COAWST implementation and improvements (Kumar et al., 2012) and activated with the option WEC_VF.

For more information and instructions, please check:

​https://github.com/myroms/roms/pull/15

This update adds the mixed-resolution split 4D-Var capability to run the outer loops (Background and Analysis phases) at a higher grid resolution than the inner loops (Increment phase). For more information, please check:

​https://github.com/myroms/roms/pull/55

A test case for the U.S. East Coast (USEC) with outer loops at 3km resolution and inner loops at 6km resolution is provided. Please check the following documentation and instructions:

​https://github.com/myroms/roms_test/blob/main/USEC/RBL4DVAR_mixres/Readme.md

This complex algorithm is intended for expert users of ROMS 4D-Var algorithms. The devil is in the details, and users need to pay acute attention to every step in the configuration.

Good luck!

This update revisits the PARALLEL I/O capabilities of ROMS with the PIO library to ensure that different configurations, including ecosystem, sediment, sea ice, bottom boundary, and wave effects on currents submodels, work correctly with the PIO library reads and writes operators.

For more information, please read and study carefully the following PR, since it includes very technical information:

​https://github.com/myroms/roms/pull/53

This capability is very tricky, but the efficiency gains are high, and each user should be considered when running large grid and computer-intensive solutions.