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 - Funding Information:
CAMPEx measurements and analysis were funded through NASA Grant 80NSSC18K0148. ACTIVATE measurements and associated data analysis were funded by NASA Grant 80NSSC19K0442 in support of the ACTIVATE Earth Venture Suborbital‐3 (EVS‐3) investigation, which is funded by NASA's Earth Science Division and managed through the Earth System Science Pathfinder Program Office. ICARTT was funded by the National Science Foundation grant ATM‐0340832. GoMACCS was funded by National Oceanic and Atmospheric Administration grant NA06OAR4310082. The other Twin Otter campaigns were funded by N00014‐04‐1‐0118, N00014‐10‐1‐0200, N00014‐11‐1‐0783, N00014‐10‐1‐0811, N00014‐16‐1‐2567, and N00014‐04‐1‐0018, with associated data analysis funded by N00014‐21‐1‐2115. AToM SAGA measurements by Jack E. Dibb were funded by NASA grant NNX15AG62A. 2
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 - Letter
AN - SCOPUS:85121027422
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 23
M1 - e2021GL096520
ER -