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Blake, Nicola J.,Blake, Donald R.,Wingenter, Oliver W.,Sive, Barkley C.,Kang, Chang Hee,Thornton, Donald C.,Bandy, Alan R.,Atlas, Elliot,Flocke, Frank,Harris, Joyce M.,Rowland, F. Sherwood 濟州大學校 基礎科學硏究所 2000 基礎科學硏究 Vol.13 No.1
Canister sampling for the determination of atmospheric mixing ratios of nonmethane hydrocarbons (NMHC_(S)), selected halocarbons, and methyl nitrate was conducted aboard the National Center for Atmospheric Research (NCAR) C-130 aircraft over the Pacific and Southern Oceans as part of the First Aerosol Characterization Experiment (ACE 1) during November and December 1995. A latitudinal profile, flown from 76˚N to 60˚S, revealed latitudinal gradients for most trace gases NMHC and halocarbon gases with predominantly anthropogenic sources, including ethane, erhyne, and tetrachloroethene, exhibited significantly higher mixing ratios in the northern hemisphere at all altitudes. Methyl chloride exhibited its lowest mixing ratios at the highest northern hemisphere latitudes, and the distributions of methyl nitrate and methyl iodide were consistent with tropical and subtropical oceanic sources. Layers containing continental air characteristic of aged biomass burning emissions were observed above about 3km over the remote southern Pacific and near New Zealand between approximately 19˚S and 43˚S. These plumes originated from the west, possibly from fires in southern Africa. The month-Ion, intensive investigation of the clean marine southern midlatitude troposphere south of Australia revealed decreases in the mixing ratios of ethane, ethyne, propane, and tetrachloroethene, consistent with their seasonal mixing ratio cycle. By contrast, increases in the average marine boundary layer concentrations cf methyl iodide, methyl nitrate, and dimethyl sulfide (DMS) were observed as the season progressed to summer conditions. These increases were most appreciable i n the region south of 44˚S over Southern Ocean waters characterized as subantaretic and polar, indicating a seasonal increase in oceanic productivity for these gases.
Meteorological and Chemical Factors Controlling Ozone Formation in Seoul during MAPS-Seoul 2015
Kim, Heejeong,Choi, Woo-Chul,Rhee, Ho-Jun,Suh, Inseon,Lee, Meehye,Blake, Donald R.,Kim, Saewung,Jung, Jinsang,Lee, Gangwoong,Kim, Deug-Soo,Park, Seung-Myung,Ahn, Junyoung,Lee, Sang Deok Taiwan Association for Aerosol Research 2018 Aerosol and air quality research Vol.18 No.9
Kim, Saewung,Sanchez, Dianne,Wang, Mark,Seco, Roger,Jeong, Daun,Hughes, Stacey,Barletta, Barbara,Blake, Donald R.,Jung, Jinsang,Kim, Deugsoo,Lee, Gangwoong,Lee, Meehye,Ahn, Joonyoung,Lee, Sang-Deok,Ch The Royal Society of Chemistry 2016 Faraday discussions Vol.189 No.-
<P>South Korea has recently achieved developed country status with the second largest megacity in the world, the Seoul Metropolitan Area (SMA). This study provides insights into future changes in air quality for rapidly emerging megacities in the East Asian region. We present total OH reactivity observations in the SMA conducted at an urban Seoul site (May-June, 2015) and a suburban forest site (Sep, 2015). The total OH reactivity in an urban site during the daytime was observed at similar levels (similar to 15 s(-1)) to those previously reported from other East Asian megacity studies. Trace gas observations indicate that OH reactivity is largely accounted for by NOX (similar to 50%) followed by volatile organic compounds (VOCs) (similar to 35%). Isoprene accounts for a substantial fraction of OH reactivity among the comprehensive VOC observational dataset (25-47%). In general, observed total OH reactivity can be accounted for by the observed trace gas dataset. However, observed total OH reactivity in the suburban forest area cannot be largely accounted for (similar to 70%) by the trace gas measurements. The importance of biogenic VOC (BVOCs) emissions and oxidations used to evaluate the impacts of East Asian megacity outflows for the regional air quality and climate contexts are highlighted in this study.</P>