Size-resolved ultrafine particle composition analysis 2. Houston

Denis J. Phares, Kevin P. Rhoades, Murray V. Johnston, Anthony S. Wexler

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


Between 23 August and 18 September 2000, a single-ultrafine-particle mass spectrometer (RSMS-II) was deployed just east of Houston as part of a sampling intensive during the Houston Supersite Experiment. The sampling site was located just north of the major industrial emission sources. RSMS-II, which simultaneously measures the aerodynamic size and composition of individual ultrafine aerosols, is well suited to resolving some of the chemistry associated with secondary particle formation. Roughly 27,000 aerosol mass spectra were acquired during the intensive period. These were classified and labeled based on the spectral peak patterns using the neural networks algorithm, ART-2a. The frequency of occurrence of each particle class was correlated with time and wind direction. Some classes were present continuously, while others appeared intermittently or for very short time durations. The most frequently detected species at the site were potassium and silicon, with lesser amounts of organics and heavier metals.

Original languageEnglish (US)
JournalJournal of Geophysical Research D: Atmospheres
Issue number7
StatePublished - Apr 16 2003


  • Aerosol
  • Houston
  • Mass spectrometry
  • Single particle analysis
  • Source apportionment
  • Supersite

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics


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