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

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

doi:10.1029/2021GL096520

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

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

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

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.

Original language	English (US)
Article number	e2021GL096520
Journal	Geophysical Research Letters
Volume	48
Issue number	23
DOIs	https://doi.org/10.1029/2021GL096520
State	Published - Dec 16 2021

Keywords

ACTIVATE
CAMPEx
Oxalate
cloud processing
secondary organic aerosol
sulfate

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2021GL096520

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Hilario, M. R. A., Crosbie, E., Bañaga, P. A., Betito, G., Braun, R. A., Cambaliza, M. O., Corral, A. F., Cruz, M. T., Dibb, J. E., Lorenzo, G. R., MacDonald, A. B., Robinson, C. E., Shook, M. A., Simpas, J. B., Stahl, C., Winstead, E., Ziemba, L. D., & Sorooshian, A. (2021). Particulate Oxalate-To-Sulfate Ratio as an Aqueous Processing Marker: Similarity Across Field Campaigns and Limitations. Geophysical Research Letters, 48(23), Article e2021GL096520. https://doi.org/10.1029/2021GL096520

Hilario, MRA, Crosbie, E, Bañaga, PA, Betito, G, Braun, RA, Cambaliza, MO, Corral, AF, Cruz, MT, Dibb, JE, Lorenzo, GR, MacDonald, AB, Robinson, CE, Shook, MA, Simpas, JB, Stahl, C, Winstead, E, Ziemba, LD & Sorooshian, A 2021, 'Particulate Oxalate-To-Sulfate Ratio as an Aqueous Processing Marker: Similarity Across Field Campaigns and Limitations', Geophysical Research Letters, vol. 48, no. 23, e2021GL096520. https://doi.org/10.1029/2021GL096520

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title = "Particulate Oxalate-To-Sulfate Ratio as an Aqueous Processing Marker: Similarity Across Field Campaigns and Limitations",

abstract = "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.",

keywords = "ACTIVATE, CAMPEx, Oxalate, cloud processing, secondary organic aerosol, sulfate",

author = "Hilario, {Miguel Ricardo A.} and Ewan Crosbie and Ba{\~n}aga, {Paola Angela} and Grace Betito and Braun, {Rachel A.} and Cambaliza, {Maria Obiminda} and Corral, {Andrea F.} and Cruz, {Melliza Templonuevo} and Dibb, {Jack E.} and Lorenzo, {Genevieve Rose} and MacDonald, {Alexander B.} and Robinson, {Claire E.} and Shook, {Michael A.} and Simpas, {James Bernard} and Connor Stahl and Edward Winstead and Ziemba, {Luke D.} and Armin Sorooshian",

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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

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

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KW - cloud processing

KW - secondary organic aerosol

KW - sulfate

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

Abstract

Keywords

ASJC Scopus subject areas

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