TY - JOUR
T1 - Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis
AU - Dang, Caroline
AU - Segal-Rozenhaimer, Michal
AU - Che, Haochi
AU - Zhang, Lu
AU - Formenti, Paola
AU - Taylor, Jonathan
AU - Dobracki, Amie
AU - Purdue, Sara
AU - Wong, Pui-Shan
AU - Nenes, Athanasios
AU - Arthur, Sedlacek III
AU - Coe, Hugh
AU - Redemann, Jens
AU - Zuidema, Paquita
AU - Howell, Steven
AU - Haywood, James
N1 - Funding Information:
Financial support. The first author was supported by the NASA Postdoctoral Fellowship Grant. ORACLES is a NASA EARTH Venture Suborbital-2 investigation, funded by the US National Aeronautics and Space Administrations (NASA)’s Earth Science Division and managed through the Earth System Science Pathfinder Program Office (grant no. NNH13ZDA001N-EVS2). CLARIFY-2017 was funded by a Natural Environment Research Council (NERC) Large Grant NE/L013584/1. Haochi Che and Michal Segal-Rozenhaimer are supported by a Department of Energy (DOE) Atmospheric System Research (ASR) grant, DESC0020084. Lu Zhang is funded by a Tel Aviv University postdoc fellowship. Paola Formenti is supported by the AErosols, RadiatiOn and CLOuds in southern Africa (AEROCLO-sA) project funded by the French National Research Agency under grant agreement no. ANR-15-CE01-0014-01, the French national programs LEFE/INSU and PNTS, the French National Agency for Space Studies (CNES), the European Union’s Seventh Framework Programme (FP7/2014-2018) under EUFAR2 contract no. 312609 and the South African National Research Foundation (NRF) under grant UID 105958. Paquita Zuidema acknowledges additional support from a Department of Energy grant, DE-SC0021250.
Publisher Copyright:
© Copyright:
PY - 2022/7/21
Y1 - 2022/7/21
N2 - This study characterizes single-particle aerosol composition from filters collected during the ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) and CLoud-Aerosol-Radiation Interaction and Forcing: Year 2017 (CLARIFY-2017) campaigns. In particular the study describes aged biomass burning aerosol (BBA), its interaction with the marine boundary layer and the influence of biomass burning (BB) air on marine aerosol. The study finds evidence of BBA influenced by marine boundary layer processing as well as sea salt influenced by BB air. Secondary chloride aerosols were observed in clean marine air as well as in BB-influenced air in the free troposphere. Higher-volatility organic aerosol appears to be associated with increased age of biomass burning plumes, and photolysis or oxidation may be a mechanism for the apparent increased volatility. Aqueous processing and interaction with the marine boundary layer air may be a mechanism for the presence of sodium on many aged potassium salts. By number, biomass burning potassium salts and modified sea salts are the most observed particles on filter samples. The most commonly observed BC coatings are inorganic salts. These results suggest that atmospheric processes such as photolysis, oxidation and cloud processing are key drivers in the elemental composition and morphology of aged BBA. Fresh BBA inorganic salt content, as it has an important role in the particles' ability to uptake water, may be a key driver in how aqueous processing and atmospheric aging proceed.
AB - This study characterizes single-particle aerosol composition from filters collected during the ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) and CLoud-Aerosol-Radiation Interaction and Forcing: Year 2017 (CLARIFY-2017) campaigns. In particular the study describes aged biomass burning aerosol (BBA), its interaction with the marine boundary layer and the influence of biomass burning (BB) air on marine aerosol. The study finds evidence of BBA influenced by marine boundary layer processing as well as sea salt influenced by BB air. Secondary chloride aerosols were observed in clean marine air as well as in BB-influenced air in the free troposphere. Higher-volatility organic aerosol appears to be associated with increased age of biomass burning plumes, and photolysis or oxidation may be a mechanism for the apparent increased volatility. Aqueous processing and interaction with the marine boundary layer air may be a mechanism for the presence of sodium on many aged potassium salts. By number, biomass burning potassium salts and modified sea salts are the most observed particles on filter samples. The most commonly observed BC coatings are inorganic salts. These results suggest that atmospheric processes such as photolysis, oxidation and cloud processing are key drivers in the elemental composition and morphology of aged BBA. Fresh BBA inorganic salt content, as it has an important role in the particles' ability to uptake water, may be a key driver in how aqueous processing and atmospheric aging proceed.
UR - https://doi.org/10.5194/acp-22-9389-2022
U2 - 10.5194/acp-22-9389-2022
DO - 10.5194/acp-22-9389-2022
M3 - Article
VL - 22
SP - 9389
EP - 9412
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
SN - 1680-7316
IS - 14
ER -