Factors influencing the seasonal variation in particulate nitrate at Cheju island, South Korea

Hiroshi Hayami*, Gregory R. Carmichael

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


The seasonal variation in measured particulate nitrate at Cheju island, South Korea, is analyzed and shown to exhibit high concentrations from February to June and in October, and low values from July to September. Total nitrate concentrations, which are not monitored, are estimated with a gas-aerosol equilibrium model with two-size bins. The total nitrate concentrations are shown to be maximum in June and minimum in August, and these differences are associated with air-mass trajectories. The fraction of particulate to total nitrate is estimated and shown to be sensitive to the total nitrate concentrations and the coarse-mode composition that is dominated by non-volatile species. The particulate nitrate fractions are found to vary within a relatively narrow range around the annual-mean value, indicating that the particulate nitrate concentrations behave similarly to the total nitrate concentrations. Exceptions are found for April, June and July. For April the largest particulate nitrate fraction is found in association with very high concentrations of nss-calcium, an indicator of mineral aerosol. The smallest particulate nitrate fractions occur in June and July and are the result of a combination of low concentrations of nss-calcium, sea salt and total nitrate, and high concentration of nss-sulfate.

Original languageEnglish
Pages (from-to)1427-1434
Number of pages8
JournalAtmospheric Environment
Issue number8
Publication statusPublished - 1998 Apr 1
Externally publishedYes
EventProceedings of the 1996 5th International Conference on Atmospheric Sciences and Applications to Air Quality, ASAAQ - Seattle, WA, USA
Duration: 1996 Jun 181996 Jun 20


  • Coarse particles
  • East Asia
  • Gas-aerosol equilibrium
  • Partitioning of nitrate

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science


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