PM 2.5 Dry calculations - MOSIAC scheme

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linlu9876
Posts: 14
Joined: Fri Jul 10, 2020 11:11 pm

PM 2.5 Dry calculations - MOSIAC scheme

Post by linlu9876 » Mon Nov 23, 2020 6:26 pm

Dear all,

Please could you help me with calculations from the wrf outs?
I wonder how can I use PM2.5 dry from chem option 201 to compare with ground obvs data?
Do I need to add the component bins (a01 to a03 ) to get the water component to the PM2.5? How can I add water component to the pom2.5 diagnostic in the wrfout files?

Please help me

Thanks
Lin

jordanschnell
Posts: 141
Joined: Thu Feb 27, 2020 10:58 pm

Re: PM 2.5 Dry calculations - MOSIAC scheme

Post by jordanschnell » Tue Dec 01, 2020 7:58 pm

Hi Lin,

Depending on what ground site data you are referring to, you should be able to directly compare modeled PM2_5_DRY to ground station data. Most ground PM data report the dry weight (or something at ~30% RH, which would not result in hygroscopic growth). Check with the data reporting to make sure. If you need the aerosol water content, you can do two things:

1. If you haven't yet run your simulations, add PM_2_5_WATER to your output history by using the my_iofields file/namelist option.
2. Use water_ao{1..4} - here you will need to multiple by air density since the units are ug/kg.

Jordan

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