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Title: Influence of crustal dust and sea spray supermicron particle concentrations and acidity on inorganic NO 3 aerosol during the 2013 Southern Oxidant and Aerosol Study

Inorganic aerosol composition was measured in the southeastern United States, a region that exhibits high aerosol mass loading during the summer, as part of the 2013 Southern Oxidant and Aerosol Study (SOAS) campaign. Measurements using a Monitor for AeRosols and GAses (MARGA) revealed two periods of high aerosol nitrate (NO 3 ) concentrations during the campaign. These periods of high nitrate were correlated with increased concentrations of supermicron crustal and sea spray aerosol species, particularly Na + and Ca 2+, and with a shift towards aerosol with larger (1 to 2.5 μm) diameters. We suggest this nitrate aerosol forms by multiphase reactions of HNO 3 and particles, reactions that are facilitated by transport of crustal dust and sea spray aerosol from a source within the United States. The observed high aerosol acidity prevents the formation of NH 4NO 3, the inorganic nitrogen species often dominant in fine-mode aerosol at higher pH. In addition, calculation of the rate of the heterogeneous uptake of HNO 3 on mineral aerosol supports the conclusion that aerosol NO 3 is produced primarily by this process, and is likely limited by the availability of mineral cation-containing aerosol surface area. Modeling of NO 3 andmore » HNO 3 by thermodynamic equilibrium models (ISORROPIA II and E-AIM) reveals the importance of including mineral cations in the southeastern United States to accurately balance ion species and predict gas–aerosol phase partitioning.« less
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ; ORCiD logo [5] ;  [5] ;  [6] ;  [6] ;  [7] ;  [8] ;  [8] ;  [3]
  1. Reed College, Portland, OR (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Reed College, Portland, OR (United States); Univ. of California, Irvine, CA (United States)
  3. Reed College, Portland, OR (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. Ecole Polytechnique Federale Lausanne, Lausanne (Switzlerland)
  6. Atmospheric Research & Analysis, Inc., Cary, NC (United States)
  7. Ludwig-Maximilians-Univ., Munich (Germany)
  8. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1680-7324; 47887; 48347; KP1704020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 15; Journal Issue: 18; Journal ID: ISSN 1680-7324
European Geosciences Union
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Org:
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; Environmental Molecular Sciences Laboratory
OSTI Identifier: