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How is nu_div (weighting of divergence component when applying hyperviscosity) used?

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jihwang@...
How is nu_div (weighting of divergence component when applying hyperviscosity) used?

Hello All:

In user_nl_cam, there is a parameter called "nu_div". It seems to me that CAM5 damps divergent flow using "nu_div" parameter, not "nu". Is this correct? Does anybody know exactly how "nu_div" and "nu" is used and how they differ?

Thank you very much.

Best Regards,
Jihwang (Aaron) Wang
NOAA/PSD & CIRES

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