팔당호로의 질소와 황성분 침적 측정

Abstract

Nitrogen and sulfur deposition was measured on Lake Paldang from March 2002 to October 2003. Wet and drydepositions were separately measured using wet- and dry-only samplers, respectively. In order to measure the drydeposition to the water body, a dry deposition sampler composed of three pans lled with pure water, called thedeposition water, was used. Since ammonium was generally in excess in ambient air, more than half of ammoniumwas present in the gaseous form. Ammonium concentration was also generally higher than the sum of major anionconcentrations in the deposition water because gaseous species were much easily deposited than the species in eparticles. Nevertheless, the contribution of gaseous ammonia to the deposition of ammonium was not high as wellas that of particulate ammonium while the contribution of gaseous nitric acid was much higher than that ofparticulate nitrate. Annual wet deposition xes of nitrogen and sulfur were e and six times higher than their drydeposition xes, respectively. Except for ammonium, the dry deposition x estimated in the present work was ahalf of the previous results. This was mainly caused by much smaller dry deposition velocities over the water thanover the ground.