CCSM4 (CAM4) Tuning Parameter Perturbation Study T85T85.F1850
notes: all simulations run at Oak Ridge on Jaguar control simulation
(all default values) = isolated perturbaton simulations (value' per param)
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|
|
Parameter |
Default Value |
Changed Value |
Code Location |
Parameter Function/Description |
|
.90 |
.45 |
namelist: cldfrc_rhminl (cloud_fraction.F90) |
minimum rh for low stable clouds |
|
|
.77 |
.385 |
namelist: cldfrc_rhminh (cloud_fraction.F90) |
minimum rh for high stable clouds |
|
|
.04 |
.4 |
cloud_fraction.F90 |
parameter for shallow convection cloud fraction, code: shallowcu = max(0.0_r8,min(sh1*log(1.0_r8+sh2*cmfmc2(i,k+1)),0.30_r8)) |
|
|
500 |
5000. |
cloud_fraction.F90 |
parameter for shallow convection cloud fraction, " " |
|
|
.1 |
1.0 |
cloud_fraction.F90 |
parameter for deep convection cloud fraction, code: deepcu = max(0.0_r8,min(dp1*log(1.0_r8+dp2*(cmfmc(i,k+1)-cmfmc2(i,k+1))),0.60_r8)) |
|
|
500. |
5000. |
cloud_fraction.F90 |
parameter for deep convection cloud fraction, " " |
|
|
250. |
750. |
cloud_fraction.F90 |
top pressure bound for mid level cloud |
|
|
10.0e-6 |
1.e-6 |
cldwat.F90 |
critical radius at which autoconverion becomes efficient |
|
|
45.0e-6 |
4.5 e-6 |
cldwat.F90 |
threshold for autoconversion cold ice, code: icrit = icritc*wt + icritw*(1-wt) |
|
|
2.e-4 |
.2 e-4 |
cldwat.F90 |
threshold for autoconversion warm ice, " " |
|
|
5. e-6 |
.5 e-6 |
cldwat.F90 |
tunable constant for evaporation of precip |
|
|
400. |
800. |
cldwat.F90 |
warm continental cloud particles density /cm3 |
|
|
150. |
75. |
cldwat.F90 |
cold continental and oceanic cloud particles density /cm3 |
|
|
75. |
30. |
cldwat.F90 |
sea ice cloud particles density /cm3 |
|
|
1800. |
3600. |
hk_conv.F90 |
characteristic adjustment time scale for moist convection (time over which convection is assumed to act) |
|
|
5. e-5 |
5. e-6 |
hk_conv.F90 |
rain water autoconversion coefficient for moist convection |
|
|
3600. |
7200. |
zm_conv.F90 |
convection time scale |
|
|
3.5 e-3 |
3.5 e-4 |
zm_conv.F90 |
used for condensed liquid/rain production rate, tunable param |
|
|
1.e -6 |
1.e -5 |
zm_conv.F90 |
tunable evaporation efficieny |
|
|
14. |
7. |
pkg_cldoptics.F90 |
liquid drop size over ocean (micron) |
|
|
8. |
4. |
pkg_cldoptics.F90 |
liquid drop size over land (micron) |
|
|
14. |
7. |
pkg_cldoptics.F90 |
liquid drop size over ice (micron) |