Just as I quoted the setting method in the forum, why setting progn=0 is to turn off the aerosol indirect effect?

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cxyiyh
Posts: 30
Joined: Mon Nov 02, 2020 12:54 am

Just as I quoted the setting method in the forum, why setting progn=0 is to turn off the aerosol indirect effect?

Post by cxyiyh » Wed Dec 16, 2020 3:27 pm

Hi,friends,
Just as I quoted the setting method in the forum, why setting progn=0 is to turn off the aerosol indirect effect? Does this approach accurately indicate that the aerosol cloud interaction is turned off?
I just know setting progn=0 means no prognostic aerosols.
gc13141112 wrote:
Thu Apr 11, 2019 3:35 am
setting namelist.input for no aerosol feed back
progn = 0
ra_lw_physics = 4
ra_sw_physics = 4
chem_opt = 2
aer_ra_feedback = 0

setting namelist.input for aerosol direct effects
progn = 0
ra_lw_physics = 4
ra_sw_physics = 4
chem_opt = 2
aer_ra_feedback = 1

setting namelist.input for aerosol direct and indirect effects
progn = 1
ra_lw_physics = 4
ra_sw_physics = 4
chem_opt = 2
wetscav_onoff = 1,
cldchem_onoff = 1,
aer_ra_feedback = 1

The three figures in attachments
Another questions is setting chem_opt = 2 seems to have no aqueous phase chemistry.How do I consider the role of aqueous phase chemistry in the cloud?

Thanks to everyone who discussed and answered my questions!

Best Regards!

yours,
cxyiyh

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