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  • What's the impact of resolution on the forecast of the storm?

  • Reduce the timestep of the model - does this improve or worsen the forecast?

  • Reduce the gravity wave drag - how does this affect the forecast in the upper and lower levels?

 

Expand
titleHow to change the code to reduce gravity wave drag (Click here to expand)

 Edit the source code to half the gravity wave drag coefficient

File: ifs/phys_ec/sugwd.F90, change:

Code Block
Line 108: !  Revised gwd parameter values
Line 109: GKDRAG =0.15_JPRB

to:

Code Block
Line 108: !  Revised gwd parameter values
Line 109: GKDRAG = 0.075_JPRB   !  half GWD coefficient: 0.15_JPRB

 

 

Further reading

This article in a recent ECMWF Newsletter has a description of student projects at the University of Stockholm using the Lothar storm case study.

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