What's DTCOND composed of in CAM6 with CLUBB?

[hhzhang]

Hi,

What are the components making up DTCOND in CAM6 (CLUBB)? I assume its composition has changed from old CAM versions owing to the update of parameterizations.

And what are the components making up PTTEND in CAM6_CLUBB?

Thanks.
Honghai

PS. I found the following post for CAM4/5, but I don't think it's the same in CAM6.
"
DTCOND = ZMDT + EVAPTZM + CMFDT + EVAPTCM + HPROGCLD/CPAIR + HSED/CPAIR
where:
- ZMDT - Zhang moist convection tendency (creating rain only)
- EVAPTZM - T tendency from snow formation and rain and snow evaporation of Zhang convective precip
- CMFDT - shallow moist convection tendency
- EVAPTCM - T tendency from snow formation and rain and snow evaporation of shallow convective precip
- HPROGCLD - energy (W/kg) from prognostic cloud water (stratiform)
- HSED - energy (W/kg) from evaporation of sedimentation
- CPAIR = 1.00464e3 J/(kg K)
"

 

[nusbaume]

Hi Honghai,

The physical parameterizations that make-up DTCOND in CAM6 are the following:

1. dry adiabatic adjustment
2. Deep convection (ZM scheme)
3. CLUBB scheme (shallow convection + moist turbulence + cloud macrophysics)
4. Cloud microphysics (MG2 scheme)

After quickly looking through the code, I believe you can at least approximate DTCOND with the following other history variables:

DTCOND ~= ZMDT + EVAPTZM + ZMMTT + STEND_CLUBB/CPAIR + TTENDICE + MPDT

ZMDT - Zhang-McFarlane (ZM) moist convection T tendency
EVAPTZM - T tendency from snow formation and rain and snow evaporation of ZM convective precip
ZMMTT - T tendency from ZM convective momentum transport
STEND_CLUBB - Static energy tendency from CLUBB
TTENDICE - T tendency from CLUBB Ice Saturation Adjustment
MPDT - T tendency due to MG2 cloud microphysics

CPAIR = 1004.64 J/kg/K

Hope that helps, and have a great day!

Jesse

 

[CESM researcher]

Hi Honghai,

The physical parameterizations that make-up DTCOND in CAM6 are the following:

1. dry adiabatic adjustment
2. Deep convection (ZM scheme)
3. CLUBB scheme (shallow convection + moist turbulence + cloud macrophysics)
4. Cloud microphysics (MG2 scheme)

After quickly looking through the code, I believe you can at least approximate DTCOND with the following other history variables:

DTCOND ~= ZMDT + EVAPTZM + ZMMTT + STEND_CLUBB/CPAIR + TTENDICE + MPDT

ZMDT - Zhang-McFarlane (ZM) moist convection T tendency
EVAPTZM - T tendency from snow formation and rain and snow evaporation of ZM convective precip
ZMMTT - T tendency from ZM convective momentum transport
STEND_CLUBB - Static energy tendency from CLUBB
TTENDICE - T tendency from CLUBB Ice Saturation Adjustment
MPDT - T tendency due to MG2 cloud microphysics

CPAIR = 1004.64 J/kg/K

Hope that helps, and have a great day!

Jesse

Hi ,Jesse
I've been having some problems lately. I wanted to model the effects of removing aerosol indirect effects. I found that the RK scheme did not include aerosol indirect effects, while MG did.How to replace the MG scheme with RK scheme?Could you give me some guidance.? I run model (cesm1.2.2-cam5)

 

[nusbaume]

Hi Honghai,

You should be able to turn-on the RK microphysics scheme by adding the line:

-microphys rk

to the CAM_CONFIG_OPTS line in env_build.xml. You can also use CAM4 (where the RK microphsyics is the default) instead of CAM5, which can be done by either using a CAM4 compset, or by adding the line

-phys cam4

to CAM_CONFIG_OPTS instead. Please note there there will be differences in the simulation results that are due to the microphyics differences in general, and not purely the aerosol-cloud interactions.

Anyways, I hope that helps, and good luck with your simulations!

Jesse

 

[Li1108]

Hi,

What are the components making up DTCOND in CAM6 (CLUBB)? I assume its composition has changed from old CAM versions owing to the update of parameterizations.

And what are the components making up PTTEND in CAM6_CLUBB?

Thanks.
Honghai

PS. I found the following post for CAM4/5, but I don't think it's the same in CAM6.
"
DTCOND = ZMDT + EVAPTZM + CMFDT + EVAPTCM + HPROGCLD/CPAIR + HSED/CPAIR
where:
- ZMDT - Zhang moist convection tendency (creating rain only)
- EVAPTZM - T tendency from snow formation and rain and snow evaporation of Zhang convective precip
- CMFDT - shallow moist convection tendency
- EVAPTCM - T tendency from snow formation and rain and snow evaporation of shallow convective precip
- HPROGCLD - energy (W/kg) from prognostic cloud water (stratiform)
- HSED - energy (W/kg) from evaporation of sedimentation
- CPAIR = 1.00464e3 J/(kg K)
"

Hi Honghai,

Do you know the physical processes represented by CMFDT? Does it include the convective momentum transport and the net condensation heating related to the formation of rain? or does it just represent the convective momentum transport?

Li