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서울시의 주거지역을 중심으로 한 토양-대기간 가스상 수은의 교환율 측정
정일현(II Hyun Jung),김기현(Ki Hyun Kim) 한국환경보건학회 1998 한국환경보건학회지 Vol.24 No.4
With an emphasis on the extension of our efforts to accumulate the databases for the soil-air Hg exchange processes, we conducted measurements of concentrations, concentration gradients, and fluxes of airborne Hg along with relevant environmental parameters from a monitoring site located in a residential area of Seoul, Korea during late May through mid June 1998. Our measurements showed that the frequency with which Hg emissions occur slightly exceeds those of dry deposition (58 vs 42%) and that the strength of emission is quite comparable in magnitude with that of deposition (~±8 ng/m²/hr). The results of our work also indicated quite complex temporal distribution pattern of Hg with the occurrence of reduced Hg concentrations during daytime over diurnal scale. When the relationships between different parameters are compared for both emission and dry deposition, they generally exhibited a similar pattern such that Hg data tend to be strongly correlated with several important chemical species investigated concurrently including nitrogen dioxide. Overall, the reasonably low values in concentration, gradient, and flux of Hg at the study site suggests that the Hg distributions in a residential area may not necessarily be affected by any major source processes.
한반도 서해안 배경관측점을 중심으로 한 대기중 메탄의 배출과 침적
김민영,조석주,김준,이강웅,김기현 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.3
The soil-air exchange processes of CH₄were investigated in Hari district of Kang Hwa Island, Korea during the late April 2002. In the course of our field experiments, we measured the concentration, concentration gradients(between two different heights of 1 and 5 m), and the fluxes of CH₄using the surface layer gradient micrometeorological methods. If the relationships between CH₄fluxes and the relevant environmental parameters are examined. CH₄fluxes were found to be affected most significantly by parameters like wind speed. The results of our study indicate that the study area behaved as a net source of CH₄ to the atmosphere with a net daily emission rate of 3.6 mg m^(-2). The findings of relatively low exchange rate observed at our study site suggest that the rice paddy area investigated prior to planting period can behave as a moderate source of methane.