(Last updated: November 27, 2009)

MYNN (Mellor-Yamada-Nakanishi-Niino) Level-3 Model

Authors: Dr. Mikio Nakanishi [nakanishi.mikio(at)jwa.or.jp] and Prof. Hiroshi Niino
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References

ChangeLog

Acknowledgements

Footnotes

For 3rd level simulation with a coarse grid of a few tens of kilometers, numerical instability often occurs. The cause of this instability has not been clarified yet, but mostly it can be avoided through the following changes:

<       enum = qdiv*e6c*( t3sq-t2sq )
---
>       if ( t2sq .ge. 0.0 ) then
>         enum = max( qdiv*e6c*( t3sq-t2sq ), 0.0 )
>       else
>         enum = min( qdiv*e6c*( t3sq-t2sq ), 0.0 )
>       end if

<       enum = qdiv*e6c*( c3sq-c2sq )
---
>       enum = max( qdiv*e6c*( c3sq-c2sq ), 0.0 )

where c2sq is nonnegative and a change for r2sq is the same as that for t2sq.


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