rotated grid setup

[seashellingolds]

Hi All,

When using rotated grid, I know the wind stress should be rotated beforehand in the input file.
Since "ROMS assumes that all the input vectors are already in (XI,ETA)coordinates.", does this mean that all of the velocity vectors in the climatology file/boundary file/initial condition file should be rotated accordingly too?

Thanks

Zhong

[kate]

Yes, that is the case - you have to rotate all of them. If you look at existing tools for creating initial/boundary conditions, they should be handling this already.

The forcing story is a little more complicated:
* If you have global forcing on a regular lat/lon grid, you can let ROMS interpolate and rotate as needed.
* If you have regional forcing on the ROMS grid, ROMS assumes it has already been rotated.
* ROMS decides to rotate/interpolate or not by comparing the grid dimensions between the grid file and the forcing files.

[seashellingolds]

Thank you so much for your reply Kate.