In an effort to characterize temporal and spatial variability of PM10 and to quantitatively estimate contribution of sea salt aerosol to PM10 mass in Busan area, twenty four-hour averaged concentration of PM10 were measured in two distinct areas, Gwaebeopdong(inland) and Dongsamdong(seashore), Busan for summer and fall, 2007. It was found that sea salt accounted for 2.9% and 9.5% of PM10 mass in Gwaebeopdong and Dongsamdong, respectively for the study period, indicating that contribution of sea salt to PM10 mass and total ion concentration in seashore area were consistently higher by a factor of three compared to inland area. Temporal analysis suggested that sea salt contributions to PM10 in Dongsamdong were higher in summer due to the southerly sea breeze while there was no significant fluctuation of sea salt contribution for the summer and fall months in Gwaebeopdong. Sea salt enrichment factors(EFsea) of K + , Ca 2+ and SO4 2- (>10) indicated major contributions from anthropogenic sources and EFs of Mg 2+ and Cl - exhibited strong association with oceanic origins for both areas.

Abstract
 1. Introduction
 2. Measurements and Methods
  2.1. Study sites and periods
  2.2. Instrumentation
  2.3. Measurement methods
 3. Results and discussion
  3.1. Contribution of sea salt aerosol to PM10
  3.2. Contribution of sea salt to total ions composition
  3.3. Sea salt enrichment factor(EFsea) and massfraction of sea salt
  3.4. Changes in Cl-/Na+ ratio
 4. Conclusions
 References

• Byung-Il Jeon(Department of Environmental Engineering, Silla University) Corresponding Author