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In preparation to parallel IO, I added new generic routines to mod_netcdf.F to facilitate manipulations of NetCDF data. Usually, several NetCDF library calls are required to inquire and read dimensions or variables. The new routines provide a single interface for such operations for non-tiled operations. This also facilitates error catching during IO in distributed-memory since all the internal variables are now broadcasted to all the members of the MPI group. This will be obvious when parallel IO in the future future. I will slowly clean all the NetCDF routines that are used in ROMS to manipulate IO.

I added the new observation sensitivity driver (OBS_SENSITIVITY) which quantifies the impact that each observation has on the 4DVAR data assimilation system. By measuring the sensitivity of the data assimilation system to each observation, we can determine the degree to which each observation contributes to the uncertainty in the circulation estimate. This analysis can help us to determine the type of measurements that need to be made, where to observe, and when. See the following wikiROMS ​page for more technical and mathematical formulation.

Many thanks Andy Moore for his help developing this new driver. This driver is still under testing. We will let you know in the future when it is ready to use.

I also updated the 4DVAR adjustment of surface forcing fields. Many thanks to Gregoire Broquet for his continuous help debugging this algorithm.

There is a conflict with VarName in module mod_netcdf.F. The variable varname is also used in mod_iounits.F. Many thanks to Mark Hadfield for reporting this.

I also cleaned couple of things in the adjusting of surface forcing. I have not managed to get this option right. I am sure that more changes are coming for this. This algorithm is tricky.