2015년 봄철에 선박으로 관측한 서해상 이차에어로졸 성분의 농도 및 오염 특성
Concentration and Pollution Characteristics of Secondary Aerosol Components Over the Yellow Sea by Ship-Borne Observation in Spring, 2015
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초록
The PM10 and PM2.5 particles over the Yellow Sea of Korea were collected by shipborne observation during two cruises in spring, 2015. Their water-soluble ionic components such as NH4 +, Na+, K+, Mg2+, Ca2+, SO4 2−, NO3 −, Cl−, F−, CH3COO−, HCOO−, and CH3SO3 − were analyzed, in order to examine the pollution characteristics of the secondary aerosol components. The comparative study of particle size distribution has resulted that NH4 +, nss-SO4 2−, nss-Mg2+, nss-K+, HCOO−, and CH3SO3 − species mostly existed in fine particle mode. Meanwhile, nss-F− and sea-salt species were distributed in both fine and coarse particle mode, NO3 −, nss-Ca2+, CH3COO− species were rich in coarse particle mode. The concentrations of secondary pollutants (nss-SO4 2−, NO3 −, NH4 +) increased in fine particles, and those of natural components (nss- Ca2+, Sea-salt) increased in coarse particles. NH4 + exists as the form of (NH4)2SO4 and NH4NO3, and mostly as (NH4)2SO4 in fine particles. NH4NO3 has lower content compared to (NH4)2SO4, and it mostly existed in fine particles at Yellow Sea I and in coarse particles at Yellow Sea II. The concentration ratios of NO3 −/nss-SO4 2− for Yellow Sea I and Yellow Sea II were 0.52 and 0.16 in coarse particles, and they were 0.64 and 0.38 in fine particles, respectively, showing that the stationary source emissions were more important than mobile source emissions in Yellow Sea II (except Passage II-4).
Abstract
The PM10 and PM2.5 particles over the Yellow Sea of Korea were collected by shipborne observation during two cruises in spring, 2015. Their water-soluble ionic components such as NH4 +, Na+, K+, Mg2+, Ca2+, SO4 2−, NO3 −, Cl−, F−, CH3COO−, HCOO−, and CH3SO3 − were analyzed, in order to examine the pollution characteristics of the secondary aerosol components. The comparative study of particle size distribution has resulted that NH4 +, nss-SO4 2−, nss-Mg2+, nss-K+, HCOO−, and CH3SO3 − species mostly existed in fine particle mode. Meanwhile, nss-F− and sea-salt species were distributed in both fine and coarse particle mode, NO3 −, nss-Ca2+, CH3COO− species were rich in coarse particle mode. The concentrations of secondary pollutants (nss-SO4 2−, NO3 −, NH4 +) increased in fine particles, and those of natural components (nss- Ca2+, Sea-salt) increased in coarse particles. NH4 + exists as the form of (NH4)2SO4 and NH4NO3, and mostly as (NH4)2SO4 in fine particles. NH4NO3 has lower content compared to (NH4)2SO4, and it mostly existed in fine particles at Yellow Sea I and in coarse particles at Yellow Sea II. The concentration ratios of NO3 −/nss-SO4 2− for Yellow Sea I and Yellow Sea II were 0.52 and 0.16 in coarse particles, and they were 0.64 and 0.38 in fine particles, respectively, showing that the stationary source emissions were more important than mobile source emissions in Yellow Sea II (except Passage II-4).
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