Aerosol optical depth too low despite aerosol concentrations being sensible.

R

rgr_aus

New member
Hi all,
I am using WRF-Chem to examine cloud/aerosol interactions in Australia. The model simulates aerosol concentrations reasonably well, but the aerosol optical depth (calculated from the EXTCOFF55 variable) is approximately an order of magnitude too low.
Does anyone have any advice on how to diagnose this problem?
I suspect it could be the column ozone profile. I'm struggling to find where this is defined, should I be looking in RRTMG, or in the photolysis code ( I am using the FAST-J photolysis scheme, phot_opt=2 , and CBMZ-MOSAIC chemistry/aerosol scheme ).
Thanks,
Rob
 
Hi,

The ozone column will not have an impact on EXTCOFF55 -- are you sure you are calculating AOD correctly (i.e., summing EXTCOEFF*DZ through all of the layers?)

Jordan
 
Hi.. Have you resolved the issue? I am facing the same problem of low AOD. I really appreciate any help you can provide.
rgr_aus said:
Hi all,
I am using WRF-Chem to examine cloud/aerosol interactions in Australia. The model simulates aerosol concentrations reasonably well, but the aerosol optical depth (calculated from the EXTCOFF55 variable) is approximately an order of magnitude too low.
Does anyone have any advice on how to diagnose this problem?
I suspect it could be the column ozone profile. I'm struggling to find where this is defined, should I be looking in RRTMG, or in the photolysis code ( I am using the FAST-J photolysis scheme, phot_opt=2 , and CBMZ-MOSAIC chemistry/aerosol scheme ).
Thanks,
Rob
Click to expand...
Hi.. Have you resolved the issue? I am facing the same problem of low AOD. I really appreciate any help you can provide.
 
rgr_aus said:
Hi all,
I am using WRF-Chem to examine cloud/aerosol interactions in Australia. The model simulates aerosol concentrations reasonably well, but the aerosol optical depth (calculated from the EXTCOFF55 variable) is approximately an order of magnitude too low.
Does anyone have any advice on how to diagnose this problem?
I suspect it could be the column ozone profile. I'm struggling to find where this is defined, should I be looking in RRTMG, or in the photolysis code ( I am using the FAST-J photolysis scheme, phot_opt=2 , and CBMZ-MOSAIC chemistry/aerosol scheme ).
Thanks,
Rob
Click to expand...
Hi.. Have you resolved the issue? I am facing the same problem with low AOD. I really appreciate any help you can provide. Thanks in Advance
 
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