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PM2.5 in CESM

H

Hemraj

Hemraj Bhattarai
Member
Dear all,
I didn't see the PM2.5 model output in the CESM. Could anyone suggest to me what parameters should I add to get it? I saw one post in the same forum asking a similar question in 2019 but no replies (PM2.5 as output in cam6).
Many thanks in advance.
e.g.,
PM2.5 = a + b + c + ....

Best,
Hemraj
 
F

fgl

Forrest Lacey
New Member
You cannot calculate it directly offline unless you have some of the output saved (such as water vapor content, size parameter, etc.) but you can estimate it by taking the summation of all a1,a2, and a4 tracers with ~13.6% of the a3 tracers. You can get more accurate results by estimating the size distribution of specific a3 tracers, but at that point you are better off re-running with the PM25 tracer on.
 
A

anushree

Member
fgl said:
You cannot calculate it directly offline unless you have some of the output saved (such as water vapor content, size parameter, etc.) but you can estimate it by taking the summation of all a1,a2, and a4 tracers with ~13.6% of the a3 tracers. You can get more accurate results by estimating the size distribution of specific a3 tracers, but at that point you are better off re-running with the PM25 tracer on.
Click to expand...
Thank you Lacey for the answer.I did not get the last part-'but at that point you are better off re-running with the PM25 tracer on'.What is the PM25 tracer on?Do we have any namelist variable option for this?
 
F

fgl

Forrest Lacey
New Member
anushree said:
Thank you Lacey for the answer.I did not get the last part-'but at that point you are better off re-running with the PM25 tracer on'.What is the PM25 tracer on?Do we have any namelist variable option for this?
Click to expand...
You just need to include 'PM25' (PM2.5 as a 3D field) or 'PM25_SRF' (PM2.5 at the first/surface level only) in one of the fincl outputs in your user_nl_cam. Following the instructions for building and running here this is included as a default tracer in CESM2.2 for some, but not all I think, compsets,.

 
W

Wenyu Liu

Wenyu Liu
New Member
Goodafternoon Hemraj, sorry to disturb you. Have you solved your problem? i am learning to run CESM recently but find it difficult to output PM2.5, or even find some useful information.
 
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