Difference between revisions of "PCM vertical coordinate"
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(Created page with "== Overview == The PCM vertical coordinate, also called "model levels" is rather specific in the PCM and typically consists of hybrid "sigma-pressure" coordinates. === sigma...") |
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== Overview == | == Overview == | ||
| − | The PCM vertical coordinate, also called "model levels" is rather specific in the PCM and typically consists of hybrid "sigma-pressure" coordinates. | + | The PCM vertical coordinate, also called "model levels" is rather specific in the PCM and typically consists of "sigma" or hybrid "sigma-pressure" coordinates. What one needs to keep in mind is that model levels are not at fixed altitude, nor in most cases at fixed pressure. |
=== sigma coordinates === | === sigma coordinates === | ||
| − | === hybrid | + | === hybrid sigma pressure coordinates === |
| − | == | + | == In practice == |
| − | Information about the vertical coordinate is only partially stored in the PCM dynamics start files | + | Information about the vertical coordinate is only partially stored in the PCM dynamics start files (lon-lat or dynamico) which contain the number of atmospheric layer (llm), the ap() and bp() coefficients and the preff and pa values. |
| + | |||
| + | In addition the input [[The z2sig.def Input File|z2sig.def file]] contains extra information to generate the model vertical coordinate at run time. | ||
[[Category:Generic-Model]] | [[Category:Generic-Model]] | ||
Revision as of 11:48, 5 March 2025
Overview
The PCM vertical coordinate, also called "model levels" is rather specific in the PCM and typically consists of "sigma" or hybrid "sigma-pressure" coordinates. What one needs to keep in mind is that model levels are not at fixed altitude, nor in most cases at fixed pressure.
sigma coordinates
hybrid sigma pressure coordinates
In practice
Information about the vertical coordinate is only partially stored in the PCM dynamics start files (lon-lat or dynamico) which contain the number of atmospheric layer (llm), the ap() and bp() coefficients and the preff and pa values.
In addition the input z2sig.def file contains extra information to generate the model vertical coordinate at run time.
