2005년 우리나라 습성강하물의 특성과 분포

초록

This study was carried out to characteristics and distributions of acid deposition in Korea. Precipitation was collected by acid deposition monitoring networks and analyzed for pH, conductivity, and following major ionic components SO42-, Cl-, NO3-, NH4+, Na+, K+, Ca2+, Mg2+. During the investigation period, Volume weighted annual mean pH of precipitation in Korea is 4.8, showing slightly acidic level. The amount of rainfall in the range of pH 5.1～5.5 charged approximately 28% of annual precipitation, 23.4% in pH 4.6～5.0, and contributed 16.2% under pH 4.5. Among seasons, alkaline precipitation has occurred more often in spring, meanwhile acidic precipitation in which pH is under 4.5 has frequently occurred in autumn. Volume weighted annual mean concentrations of SO42-, NO3-, Cl- are 2.558 ㎎/ℓ, 1.590 ㎎/ℓ, 1.286 ㎎/ℓ respectively, and provided that SO42- is the major contributor, followed by NO3-, Cl-. In case of cation, annual mean concentration for NH4+, Na+, K+, Ca2+, Mg2+, H+ are 0.693 ㎎/ℓ, 0.528 ㎎/ℓ, 0.439 ㎎/ℓ, 0.455 ㎎/ℓ, 0.089 ㎎/ℓ, 0.015 ㎎/ℓ, and NH4+ were decided as the main contributor, followed by Na+, K+, Ca2+, Mg2+, H+. Annual wet deposition rate for sulfate, nitrate and ammonia are 3.316 gm-2yr-1, 2.057 gm-2yr-1, 0.894 gm-2yr-1, respectively, and it was founded that the deposition flux in summer contributes about 38.42% to 67.62% to total deposition.

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