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Yeongcheol Han,허영숙 한국대기환경학회 2014 Asian Journal of Atmospheric Environment (AJAE) Vol.8 No.2
It is often assumed that atmospheric observations atremote sites represent long-range transport of airbornematerial, and local influences are overlooked. We evaluated the impact of local input on the rainwatercomposition at Gosan Station, a strategic sitefor monitoring the continental outflow from Asia. We analyzed a 14-year record of rainwater chemicalcomposition archived by the Korea MeteorologicalAdministration and detected local terrestrial contributionfor nitrate, sulfate and ammonium. We alsomeasured the chemical composition of rainwatersampled simultaneously at multiple locations withinthe premises of the Gosan Station, from which localinfluence with meter-scale spatial heterogeneitycould be discerned. We estimate that the local inputaccounted for at least ~10% of the wet deposition ofnitrogen and ~12% of the wet deposition of sulfurduring the 14 years. This highlights the significance ofthe local influence, which should be carefully assessedwhen interpreting atmospheric observations atthis site.
Han, Yeongcheol,Huh, Youngsook Korean Society for Atmospheric Environment 2014 Asian Journal of Atmospheric Environment (AJAE) Vol.8 No.2
It is often assumed that atmospheric observations at remote sites represent long-range transport of airborne material, and local influences are overlooked. We evaluated the impact of local input on the rainwater composition at Gosan Station, a strategic site for monitoring the continental outflow from Asia. We analyzed a 14-year record of rainwater chemical composition archived by the Korea Meteorological Administration and detected local terrestrial contribution for nitrate, sulfate and ammonium. We also measured the chemical composition of rainwater sampled simultaneously at multiple locations within the premises of the Gosan Station, from which local influence with meter-scale spatial heterogeneity could be discerned. We estimate that the local input accounted for at least ~10% of the wet deposition of nitrogen and ~12% of the wet deposition of sulfur during the 14 years. This highlights the significance of the local influence, which should be carefully assessed when interpreting atmospheric observations at this site.
Han, Changhee,Burn-Nunes, Laurie J.,Lee, Khanghyun,Chang, Chaewon,Kang, Jung-Ho,Han, Yeongcheol,Hur, Soon Do,Hong, Sungmin Elsevier 2015 Talanta Vol.140 No.-
<P><B>Abstract</B></P> <P>An improved decontamination method and ultraclean analytical procedures have been developed to minimize Pb contamination of processed glacial ice cores and to achieve reliable determination of Pb isotopes in North Greenland Eemian Ice Drilling (NEEM) deep ice core sections with concentrations at the sub-picogram per gram level. A PL-7 (Fuso Chemical) silica-gel activator has replaced the previously used colloidal silica activator produced by Merck and has been shown to provide sufficiently enhanced ion beam intensity for Pb isotope analysis for a few tens of picograms of Pb. Considering the quantities of Pb contained in the NEEM Greenland ice core and a sample weight of 10g used for the analysis, the blank contribution from the sample treatment was observed to be negligible. The decontamination and analysis of the artificial ice cores and selected NEEM Greenland ice core sections confirmed the cleanliness and effectiveness of the overall analytical process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report a method for ultra-low Pb isotope determination in polar ice using TIMS. </LI> <LI> Decontamination procedure was improved for a new Greenland deep ice core. </LI> <LI> The use of a PL-7 silica-gel activator enabled sufficient Pb ion beam intensity. </LI> <LI> The procedural blanks were negligible to obtain reliable data from Greenland ice. </LI> <LI> Reliable Pb isotope analysis was achieved for a few tens of picograms of Pb. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>