[MITgcm-support] Shapiro filter configuration

[Yuan Lian]

OK, Just figured out nShapT=0 will turn off Shapiro filter for active 
tracers.
nShapT=1 is an extremely bad option, which smooths out almost everything.

In atmosperhic modeling with cube-sphere grid, I noticed strong corner 
effect
occurs if Shapiro filter is stronger, say nShapUV=2 causes much larger 
pressure
anomaly around corners than nShapUV=4. Setting nShapUV=0 actually totally
removes the corner effects. Is there any reason why this happens? Isn't 
Shapiro
filter supposed to smooth the wind vectors (so the vertical winds I 
assume) than
exaggerating them?

Thanks!

Yuan


On 6/25/11 7:15 PM, Yuan Lian wrote:
> Hi,
>
> Does anyone by chance know the difference between nShapT=1 and 
> nShapT=0? I noticed nShapT=1
> has stronger smoothing effect than nShapT=0. Are they supposed to 
> behave in this way? I though
> nShapT=1 would have weaker smoothing.
>
> Thanks!
>
> Best,
> Yuan
>
>
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