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- In many cases the setup of PUMA experiments can be defined
- using namelist variables either via MoSt or with editing
- the namelist file. In these cases PUMA can run without
- any startup files containing boundary conditions. \\
- For more complex experiments, like changes in orography
- or ground temperature, predefined vertical and horizontal
- gradients of the restoration temperature field
- and more, it is necessary to create files for boundary
- conditions. \\
- This is done with the PPP (short for Puma Pre-Processor).
- The PPP is a stand alone program, that can be called
- inside the modelstarter MoSt or explicitely by the user.
- It shares the namelist file {\bf puma\_namelist} with
- PUMA, because both programs must use the same parameters
- for consistency.
- The use in MoSt is currently restricted for using an orography
- in PUMA. If the orography option is checked in MoSt the
- PPP will be run before creating the run time environment for
- the model. The PPP creates startup definitions for
- orography, constant and time variable part of the restoration
- temperature and an initial field for surface pressure.
- Additionally the simple orography modifier of MoSt may be used
- to rise or lower parts of the orography. A mouseclick on the
- button {\bf Preprocess} will then call the PPP and make
- all necessary adjustions to start fields. \\
- More complex setups must be performed by either using some of
- the PPP namelist parameters or by adding code to PPP itself.
- This requires however a good knowledge of the FORTRAN-90
- programming language and of the model interna.
- The source code is in the file Most16/puma/src/ppp.f90.
- To make changes easier the PPP has two subroutines
- named {\bf modify\_orography} and {\bf modify\_ground\_temperature}.
- These are the recommended places to add user code. \\
- More details can be found in the FORTRAN-90 code of the PPP itself.
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