Hello everyone,
I have a question about the CB6r5 mechanism, specifically regarding SULF and ASO4.
'EVERYWHERE', 'ALL', 'SULF', 'SULF', 'GAS', 0., 'UNIT', 'a',
'EVERYWHERE', 'ALL', 'SULF', 'ASO4', 'FINE', 1., 'MASS', 'a',
'EVERYWHERE', 'ALL', 'PSO4', 'ASO4', 'FINE', 1., 'UNIT', 'a',
I have a few questions:
-
What is the difference between the two SULF species, since they appear in different namelist tables (GC and AE)?
My understanding is that SULF (gas) represents sulfuric acid (H₂SO₄, molecular weight = 98 g/mol), whereas SULF in the aerosol mechanism ultimately represents sulfate (SO₄²⁻, molecular weight = 96 g/mol).
Also, am I correct in thinking that ASO4 can be involved for condensation and nucleation, whereas SULF (gas) is involved only in condensation? Or does SULF (gas) also participate in nucleation within the CB6r5 mechanism?
-
Do SULF (gas) and SULF (FINE) partition between the gas and particle phases, or are they treated as separate species within the mechanism?
-
I have emissions of volatile sulfate particulate matter (PMSO), referring to particles containing sulfuric acid (H₂SO₄) and sulfate compounds. Is it appropriate to map these emissions only to ASO4, or should some fraction also be emitted as SULF (GAS)? or Any suggestions?
Best regards,
Darby