Slight modification in orographic gravity wave drag (OGWD) scheme#972
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rhaesung
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Please update PR description to specify which ccpp-physics PR this PR depends on. Use provided PR template. |
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@DusanJovic-NOAA Updated, thanks! |
RuiyuSun
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@rhaesung ufs-community/ccpp-physics#287 was merged. Please revert .gitmodules and update the ccpp-physics pointer to ufs-community/ccpp-physics@8a5f4f5 |
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Done! |
jkbk2004
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BrianCurtis-NOAA
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This was referenced Jun 30, 2025
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This modification is from @JongilHan66
Description
The reference height (href) in the OGWD (Orographic Gravity Wave Drag) scheme is a critical parameter that significantly influences the strength of OGWD. Currently, href is defined as the maximum of the maximum subgrid orographic elevation (Omax) and twice the standard deviation of subgrid orography (sigma), i.e.,
href = max(Omax, 2*sigma).
In the proposed modification, this is changed to:
href = max(Omax, 2*sigma, hpbl),
where hpbl is the planetary boundary layer height.
The inclusion of hpbl in determining href is informed by prior studies on the OGWD scheme:
href = hpbl (Kim and Arakawa, 1995)
href = 2* sigma (Kim and Doyle, 2005)
href = max(2*sigma, hpbl) (Hong et al., 2005)
This updated formulation of href not only improves the 500 hPa height anomaly correlation, but also helps to reduce too strong wintertime polar vortex in the upper stratosphere, where hr4a11 is the control run and hr5c01 is same as the control run but with the modified href.
Testing
UFS-RTs on Hera
Dependencies
ufs-community/ccpp-physics#287