Aerosols
When organics and inorganics share the same aerosol
Open access · cc by · source: Europe PMC
SOAS thermodynamics match MARGA ammonium–sulfate data if models mix phases carefully and nonvolatile-cation emissions are revised.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 6 empirical papers on aerosols with measured outcomes rather than reviews.
Evidence for the claim as stated.
SOAS thermodynamics match MARGA ammonium–sulfate data if models mix phases carefully and nonvolatile-cation emissions are revised.
Evidence for the claim as stated.
COVID air-quality drops and wildfire smoke are different aerosol problems; one does not calibrate the other.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
COVID air-quality drops and wildfire smoke are different aerosol problems; one does not calibrate the other.
Study at a glance
- Design
- Computational / modelling — CMAQ 5.2 and thermodynamic box models evaluated against SOAS inorganic/organic observations
- N
- Model–observation comparison for June–July 2013 SOAS; not a primary sample N
- Population
- Southeastern US aerosol thermodynamics during SOAS at Centreville and domain monitors
- Outcome
- Ammonium–sulfate partitioning and organic gas–particle bias under phase-mixing assumptions
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
When organics and inorganics share the same aerosol
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
CMAQ predicted a mean RN/2S of 0.73 versus observed 0.67.
CMAQ predicted a mean R N/2S of 0.73 over the US compared to the observed mean of 0.67.
CMAQ was run at 12 km by 12 km for 1 June–15 July 2013.
CMAQ version 5.2-gamma was run over the continental US at 12 km by 12 km horizontal resolution for 1 June–15 July 2013, coinciding with the Southern Oxidant and Aerosol Study (SOAS) field campaign and the Centreville, Alabama, US, field site.
Key findings
CMAQ mean ammonium/2×sulfate is 0.73 versus CSN 0.67. MARGA ratios ~0.8–0.9 agree with equilibrium models; AMS/CSN look too ammonium-poor. Mixing organics with inorganics can raise pH but is not the main model-evaluation problem. Organic Fp bias falls if vapor pressures drop by 4.2.
Methodology
Authors ran CMAQ 5.2 at 12 km for June–July 2013 and ISORROPIA/AIOMFAC box models against SEARCH, CSN, AMS, MARGA, and SV-TAG during SOAS at Centreville.
Limitations
AMS nitrate includes organonitrates so inorganic nitrate was zeroed; 50% of 2-methyltetrols may be dimers; cation emissions remain uncertain by about a factor of three.
Related papers in this topic
Same topic cluster — not a recommendation engine.