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

Details

• Journal Title:
  Geophysical Research Letters
• Personal Author:
  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 E. ; Shook, Michael A. ; Simpas, James Bernard ; Stahl, Connor ; Winstead, Edward ; Ziemba, Luke D. ; Sorooshian, Armin
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research)
• Description:
  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:
  General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
• Source:
  Geophysical Research Letters, 48(23)
• DOI:
  https://doi.org/10.1029/2021gl096520
• ISSN:
  0094-8276 ; 1944-8007
• Format:
  PDF
• Publisher:
  American Geophysical Union (AGU)
• Document Type:
  Journal Article
• Funding:
  Grant no. NA06OAR4310082
• Rights Information:
  Other
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:b65c89edf0fbed2f1ba84f96f585feee91340fffb08cea368a3659164b4068a3
• Download URL:
  https://repository.library.noaa.gov/view/noaa/59687/noaa_59687_DS1.pdf
• File Type:
  [PDF - 776.61 KB ]