TY - JOUR
T1 - Particulate Oxalate-To-Sulfate Ratio as an Aqueous Processing Marker
T2 - Similarity Across Field Campaigns and Limitations
AU - Hilario, Miguel Ricardo A.
AU - Crosbie, Ewan
AU - Bañaga, Paola Angela
AU - Betito, Grace
AU - Braun, Rachel A.
AU - Cambaliza, Maria Obiminda
AU - Corral, Andrea F.
AU - Cruz, Melliza Templonuevo
AU - Dibb, Jack E.
AU - Lorenzo, Genevieve Rose
AU - MacDonald, Alexander B.
AU - Robinson, Claire E.
AU - Shook, Michael A.
AU - Simpas, James Bernard
AU - Stahl, Connor
AU - Winstead, Edward
AU - Ziemba, Luke D.
AU - Sorooshian, Armin
N1 - Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
PY - 2021/12/16
Y1 - 2021/12/16
N2 - Leveraging aerosol data from multiple airborne and surface-based field campaigns encompassing diverse environmental conditions, we calculate statistics of the oxalate-sulfate mass ratio (median: 0.0217; 95% confidence interval: 0.0154–0.0296; R = 0.76; N = 2,948). Ground-based measurements of the oxalate-sulfate ratio fall within our 95% confidence interval, suggesting the range is robust within the mixed layer for the submicrometer particle size range. We demonstrate that dust and biomass burning emissions can separately bias this ratio toward higher values by at least one order of magnitude. In the absence of these confounding factors, the 95% confidence interval of the ratio may be used to estimate the relative extent of aqueous processing by comparing inferred oxalate concentrations between air masses, with the assumption that sulfate primarily originates from aqueous processing.
AB - Leveraging aerosol data from multiple airborne and surface-based field campaigns encompassing diverse environmental conditions, we calculate statistics of the oxalate-sulfate mass ratio (median: 0.0217; 95% confidence interval: 0.0154–0.0296; R = 0.76; N = 2,948). Ground-based measurements of the oxalate-sulfate ratio fall within our 95% confidence interval, suggesting the range is robust within the mixed layer for the submicrometer particle size range. We demonstrate that dust and biomass burning emissions can separately bias this ratio toward higher values by at least one order of magnitude. In the absence of these confounding factors, the 95% confidence interval of the ratio may be used to estimate the relative extent of aqueous processing by comparing inferred oxalate concentrations between air masses, with the assumption that sulfate primarily originates from aqueous processing.
KW - ACTIVATE
KW - CAMPEx
KW - Oxalate
KW - cloud processing
KW - secondary organic aerosol
KW - sulfate
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U2 - 10.1029/2021GL096520
DO - 10.1029/2021GL096520
M3 - Article
AN - SCOPUS:85121027422
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 23
M1 - e2021GL096520
ER -