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density of chemical components

R

Rgh

New Member
I am running a case with FWmadSD compset to include the D-region chemistry and in the atm.log file looking for N2,O2,O,H,He densities in cm^-3.
I found "N2-dens molecules/cm3", but for O2 and O I can see concentrations in mol/mol. I am not sure if I understand it correctly! Is this a mole fraction(moles of solute per total moles)? How can I convert it and get densities of these chemical components in cm^-3. What about H and He? I could not find them in the namelists.
Thank you for your help.
 
T

Truhaut W

Tr W
New Member
I have exactly the same question!!! I have run FXHIST compset which is also called WACCM-X. In its output, there are H, He and so on, but they all have the same unit mol/mol. And I want to get densities of these chemical components in cm^-3 too.

So is there anybody know how to do that? Any help would be greatly appreciated!!
 
T

Truhaut W

Tr W
New Member
I did a long search on the Internet and the CESM forum. But I only found a way using pressure difference between levels to convert mole fraction to total column density with unit mol/cm^2, which was still not what I really want.
 
T

Truhaut W

Tr W
New Member
I'm thinking about that, is it a way to use the variable "Pressure at layer midpoints", whose abbreviation is "PMID" in WACCM-X result. Then utilizing equation of state of ideal gas PV=nRT to calculate total number density with unit mol/m^3 or simply 1/m^3. I'm not sure that is it correct or not? And one question is that the eqution is only true for ideal gas.
 
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