March 7, 2018
As a consequence of the more streamlined release model we are now ready with a new release of GOTM - version 5.2. Updating the stable version implies a new version for the development branch as well - now 5.3.
As a user the following step must be taken in order to use the new stable version of the code.
Update to new versions have been done for all the standard test cases provided with GOTM.
In this release two new features has been implemented as described below.
Hot-start (or restart) allow to split a simulation in two or more time-chunks. GOTM will at the end of a simulation write the state of the model to a NetCDF- formatted file - restart.nc. This file can be used to provide initial conditions at a subsequent simulation. The feature is controlled via the namelist variable restart_offline by setting it to true. There are different use-cases for the hot-start facility. One involves spinning up GOTM in physics only mode and when the physics is in balance enable bio-geochemistry. The restart.nc file from the spin-up run does not contain any bio-geochemical variables - on the other hand - when the bio-geochemical is started the full state is a combination of physical and biogeochemical state-variables. In this case the variable restart_allow_missing_variable must be set to .true.. Missing variables in restart.nc will be reported to the screen - but the simulation will continue. The default setting of restart_allow_missing_variable is .false. as it is the safer setting.
The lake people have for a while asked for an option to read in longwave back- radiation instead of calculating it as part of the normal air-sea flux calculation. This feature has been implemented.
Please have a look at the planned roadmap.