제주도 강수 중 유기물질의 월별 분포 특성과 침적량에 관한 연구

Abstract

In order to evaluate the distributions and fluxes of organic matter in the atmosphere, particulate organic carbon (POC) and dissolved organic carbon (DOC) were measured in Jeju Island, Korea, from January to December 2018. The concentrations of POC and DOC were in the range of 0.62-1567 mM (AVG = 76 mM, volume-weighted average (VWA) = 36 mM) and 14.8-991 mM (AVG = 102 mM, VWA = 53 mM), respectively. The highest concentration of POC and DOC were found in January 2018. This result seems to be associated with incomplete combustion of fossil-fuel during winter. According to back-trajectories (HYSPLIT model), the groups consist of events with air mass originated from the continent of asia (40%), ocean (51%), and local (9%). The colored dissolved organic matter (CDOM) components were characterized using the parallel factor analysis (PARAFAC) model. C1, C2, C3, and C4 were characterized anthropogenic sources such as humic-like substances and polycyclic aromatic hydrocarbon (PAHs), and C5 was characterized natural sources such as protein-like. The VWA DOC concentrations were positively correlated with anthropogenic component (R2 = 0.75) and natural component (R2 = 0.7). Atmospheric DOC in Jeju seems to be originated from anthropogenic and natural sources. The monthly wet depositional fluxes of POC and DOC at Jeju varied from 0.01-1.23 mmol cm-2 month-1 and 0.24-1.31 mmol cm-2 month-1, respectively. The highest flux of POC was found in March due to the highest concentration of POC, and that of DOC was observed in September owing to the highest amount of precipitation. The lowest flux of POC was found in July due to the lowest concentration of POC, and that of DOC was observed in November, owing to the lowest amount of precipitation. The annual flux of POC was relatively higher than that in other regions, while the annual flux of DOC was relatively lower than that in other regions. The monthly wet depositional fluxes of CDOM at Jeju - vi varied from 0.4-7.6 μg QS month-1. The highest flux of CDOM was found January, while the lowest flux of CDOM was found December. The annual fluxes of CDOM was 28 ×1012 μg QS yr-1and relatively lower than other sources such as Changjiang river, and organic sediments diffusion. In order to understand the behavior of organic matter in the atmosphere, extensive studies are necessary in the future over greater time-scale using various chemical tracers.