Aerosols WG updatesBecky Alexander, Colette Heald,

Jeff Pierce, Fangqun Yu

13.3.0

Questions:1.Should blowing snow emissions to be turned on by default? 2.Should we separate the blowing snow and open ocean emissions (currently they are lumped in together in HEMCO)

Emerson et al. (2020) dry deposition (set for 13.3)

Brown Carbon from Fires

● Fires are the largest source of BrC; BrC dominates uncertainty in the sign and magnitude of DRE of fires

● Considerable uncertainty in initial absorption from different fires and how this evolves in the atmosphere (field observations generally consistent with a ~1 day photochemical bleaching)

● Could be added to standard simulation (requires addition of 3 tracers) if sufficient interest

[Wang et al., 2018 and Carter et al., submitted]

Meng et al. (2021) 0.25°x0.3125° offline dust emissions(set for 13.2)

Online 2°x2.5° emis

Offline 0.25°x0.3125° emis

Updated aerosol hygroscopicity and optical-property updates from Latimer and Martin (2019) (already incorporated)

Mass scattering efficiency

Looking forward

Add sulfate dependence to SOA yield from isoprene in simple SOA (Eloise, 6-12 mo)

Updated DMS chemistry from Will Porter’s group (UC Riverside)