Particulate Oxalate-to-Sulfate Ratio as an Aqueous Processing Marker: Similarity Across Field Campaigns and Limitations

Hilario, Miguel Ricardo A.; Crosbie, Ewan; Bañaga, Paola Angela; Betito, Grace; Braun, Rachel A.; Cambaliza, Maria Obiminda; Corral, Andrea F.; Cruz, Melliza Templonuevo; Dibb, Jack E.; Lorenzo, Genevieve Rose; MacDonald, Alexander B.; Robinson, Claire; Shook, Michael A.; Simpas, James Bernard; Stahl, Connor; Winstead, Edward L.; Ziemba, Luke D.; Sorooshian, Armin

doi:10.1002/essoar.10507581.2

Cited by 1 publication

(2 citation statements)

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“…There were also higher concentrations of oxalate during southerly days, which can be used as a tracer for aqueous processing (Hilario et al, 2021), wherein cloud droplets are formed from oxidized volatile organic compounds (Ervens et al, 2011;Ervens, 2015;Mcneill, 2015). Further, there were significant differences in median concentrations between southerly and northerly flow days during BOAS and MACAWS (0.12/0.05 and 0.08/0.03 µg m -3 , respectively).…”

Section: Airborne: Tracer Species In Cloud Watermentioning

confidence: 95%

“…Further, there were significant differences in median concentrations between southerly and northerly flow days during BOAS and MACAWS (0.12/0.05 and 0.08/0.03 µg m -3 , respectively). Precursors to oxalate are diverse including from biogenic sources, biomass burning, combustion (e.g., Stahl et al, 2020 and references therein), shipping, along with being associated with sea salt and dust owing to gasparticle partitioning (Sorooshian et al, 2013;Stahl et al, 2020;Hilario et al, 2021); such sources are presumed to be influential during southerly flow based on the notion that air masses are influenced by some combination of continental emissions and extended time in shipping lanes.…”

Section: Airborne: Tracer Species In Cloud Watermentioning

confidence: 99%

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Differences in aerosol and cloud properties along the central California coast when winds change from northerly to southerly

Zeider,

Betito,

Bucholtz

et al. 2024

Preprint

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Abstract. Wind reversals resulting in southerly flow along the California coast are not well understood in terms of how aerosol and cloud characteristics change. This gap is addressed using airborne field measurements enhanced with data from space-borne remote sensing (Moderate Resolution Imaging Spectroradiometer), surface stations (Interagency Monitoring of Protected Visual Environments), and models (Navy Aerosol Analysis and Prediction System and Coupled Ocean/Atmosphere Mesoscale Prediction System), with a focus on sub- and supermicron aerosol, and cloud microphysical variables: cloud droplet number concentration (Nd), cloud optical thickness (COT), and cloud droplet effective radius (re). Southerly flow coincided with higher values of submicron aerosol concentration (Na) and mass concentrations of species representative of fine aerosol pollution (NO3- and nss-SO42-) and shipping/continental emissions (V, oxalate, NH4+, Ni, OC, and EC). Supermicron Na did not change, however, heightened levels of acidic species in southerly flow coincided with reduced Cl-:Na+ suggestive of Cl- depletion in salt particles. Clouds responded correspondingly in southerly flow, with more acidic cloud water, higher levels of similar species as in the aerosol phase (e.g., NO3-, nss-SO42-, NH4+, V), along with elevated values of Nd and COT and reduced re during campaigns with similar cloud liquid water paths. Case study flights help to visualize offshore pollution gradients and highlight the sensitivity of the results to the presence of widespread smoke coverage including how associated plumes have enhanced supermicron Na. These results have implications for aerosol-cloud interactions during wind reversals, and have relevance for weather, public welfare, and aviation.

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