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Aerosol water alone cannot fix organic-aerosol bias
Adding aerosol liquid water to SOA partitioning without non-ideality overpredicts nighttime carbon; daytime OA in the southeast US still needs extra sources.
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What default SOA pathway do chemical transport models emphasize?
Dry condensation of low-volatility organics in the absence of water.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
Why can aerosol water not be added as an ideal solvent?
Without non-ideality, aerosol liquid water and carbon are overestimated at night.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
What OC biases did the γ ≠ 1 simulation achieve?
−4%, −10%, and −2% at IMPROVE, CSN, and SEARCH.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
What fraction of southeast US OA was water-soluble in summer 2013?
90% of total OA on average.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
Did adding water reproduce daytime OA at SEARCH?
No; even ideal-water cases could not match daytime observed OA.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
Which semivolatiles were predicted least soluble?
Monoterpene nitrates.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
How badly does CMAQ overpredict POA during SOAS?
By almost a factor of 2.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
What domain and period were simulated?
Eastern United States, June 2013, 12 km grid.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
How were isoprene emissions adjusted?
Increased 50% versus BEIS to better match CTR isoprene and OH.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
What still needs adding for daytime OA?
New precursors and/or new SOA pathways, especially during the day.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified
What POA/SOA compensating error did they diagnose?
Factor-of-2 POA overestimates compensating ~40% SOA underestimates in IMPROVE and CSN.
Source: On the implications of aerosol liquid water and phase separation for organic aerosol mass · DOI · quote verified