hch081@uib_no
New Member
Hello,The following parameters are different in cam.buildnml.csh of the CAM5.1 AGCM setup: f09×f09 f05×f05 cldwat_icritc = 18.0e-6 cldwat_icritc = 45.0e-6 div24del2flag = 4 div24del2flag = 42 nspltvrm = 1 nspltvrm = 2 hkconv_c0 = 1.0e-4 hkconv_c0 = 5.0e-5When I check the CAM Namelist Variables, I got the following information:cldwat_icritic: Threshold for autoconversion of cold ice in RK microphysics scheme.
div24del2flag: Chooses type of divergence damping and velocity diffusion.div24del2flag = 2 for ldiv2 (default),
= 4 for ldiv4,
= 42 for ldiv4 + ldel2
where
ldiv2: 2nd-order divergence damping everywhere and increasing in top layers
ldiv4: 4th-order divergence damping
ldel2: 2nd-order velocity-component damping targetted to top layers,
with coefficient del2coef
Default: set by build-namelistnspltvrm: Number of vertical re-mapping timesteps per physics timestep.Nspltrac is partitioned into nspltvrm and nspltrac/nspltvrm,
with the latter being the number of tracer timesteps per
re-mapping timestep, possibly rounded upward; after initialization,
the code quantity nspltrac is redefined to be the number of
tracer timesteps per re-mapping timestep.
Default: 0hkconv_c0: Rain water autoconversion coefficient for Hack shallow scheme.Default: set by build-namelistDoes it mean the parameterization is different in the two resolutions?Also, do I need to change these parameters before the experiment start?Thank you very much!Hoffman
div24del2flag: Chooses type of divergence damping and velocity diffusion.div24del2flag = 2 for ldiv2 (default),
= 4 for ldiv4,
= 42 for ldiv4 + ldel2
where
ldiv2: 2nd-order divergence damping everywhere and increasing in top layers
ldiv4: 4th-order divergence damping
ldel2: 2nd-order velocity-component damping targetted to top layers,
with coefficient del2coef
Default: set by build-namelistnspltvrm: Number of vertical re-mapping timesteps per physics timestep.Nspltrac is partitioned into nspltvrm and nspltrac/nspltvrm,
with the latter being the number of tracer timesteps per
re-mapping timestep, possibly rounded upward; after initialization,
the code quantity nspltrac is redefined to be the number of
tracer timesteps per re-mapping timestep.
Default: 0hkconv_c0: Rain water autoconversion coefficient for Hack shallow scheme.Default: set by build-namelistDoes it mean the parameterization is different in the two resolutions?Also, do I need to change these parameters before the experiment start?Thank you very much!Hoffman