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narrative description for previous update
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mzhangw authored and mkavulich committed Jul 19, 2023
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2 changes: 0 additions & 2 deletions physics/docs/pdftxt/GFS_SAMFdeep.txt
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rain conversion rate, entrainment and detrainment rates, overshooting layers,
and maximum allowable cloudbase mass flux (as of June 2018).

\b CCPP \b v6.0.0 \b Updates

\subsection ca_page Cellular Automata Stochastic Convective Organization Scheme

\b Scientific \b Background
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9 changes: 4 additions & 5 deletions physics/docs/pdftxt/THOMPSON.txt
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Expand Up @@ -70,10 +70,8 @@ for the model to provide useful guidance for aircraft icing forecasts

- Can account for cloud phase changes and provides a sound physical basis for diagnosing precipitation type reaching the ground

\section v6_enh_thompson CCPP Physics Updates
\version CCPP v6.0.0

Three mechanisms are available improve the stability of the scheme for weather forecast applications:
Recently, three mechanisms have been implemented to improve the stability of the scheme for weather forecast applications:
\a inner \a loop, \a subcycle, and \a semi-Lagrangian \a sedimentation \a of \a rain \a and \a graupel.
The inner loop and the subcycle are similar in that the physics time step is subdivided and the scheme
is activated more often than others in the physics suite. However, they differ in implementation.
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The two methods should be used exclusively. The Semi-Lagrangian sedimentation of rain and graupel (based on Juang and Hong 2010 \cite Henry_Juang_2010 )
increases numerical stability by applying the subtime step only to sedimentation computation.
Two namelist variables control the usage of the semi-Lagrangian sedimentation, \p sedi_semi and \p decfl.
\p sedi_semi is set to ‘true’ to activate the method. Decfl is a parameter that needs to avoid deformation of the arriving grids, currently, "10".
\p sedi_semi is set to ‘true’ to activate the method. \p Decfl is a parameter that needs to avoid deformation of the arriving grids, currently, "10".

\version SRW v3.0.0
\section v6_enh_thompson CCPP Physics Updates
\version UFS-SRW v3.0.0

- The ice generation supersaturation requirement for nonaerosol option is reduced from 0.25 to 0.15. The purpose is to generate more ice in
the upper level and reduce the OLR bias.
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