濟州地域 高濃度 大氣汚染 原因糾明에 觀한 氣象學적 특성

Abstract

In this study, the high concentration episode day of 2 pollutants of the atmosphere environmental standards (O3 and PM10), which had the most adverse impact on Jeju island in the past 5 years (2009 to 2013), was selected and the correlation between this episode day and the main meteorological elements (temperature, wind direction and wind velocity) were identified in order to analyze the concentration distribution characteristics, origin and moving path of the air pollutants (O3 and PM10) appeared in Jeju island and also to identify the climatic conditions influencing the high concentration O3 and PM10. Moreover, this study was conducted to investigate the exceeding frequency of O3 and PM10 concentration for each segment of temperature and wind velocity. In addition, the analysis on the numerical model was performed through the three-dimensional numerical modeling (WRF and CMAQ) after selecting the episode day of high concentration O3 in Jeju island. As a result, it was analyzed that the increase in the concentration of ozone and find dust appeared in Jeju island was the important cause of the external effects resulting from the long-range transport of ozone. As a result of the backward trajectory analysis, a majority of the air pollutants appeared in the pattern of air masses flowing from the west. In particular, the pattern of air pollutants flowing from the industrial complex in east China had a significantly high frequency. This result indicates that the transport of contaminated air masses from China makes a huge contribution to an increase in the ozone concentration of Jeju island. Moreover, the main causes of the temporal and spatial air quality variation variation were clearly evidenced in the correlation with the meteorological elements and the exceeding frequency of pollutant concentration for each segment of temperature and wind velocity. Overall, it can be assumed that the atmospheric environment variation of Jeju island is more significantly affected by the horizontal or vertical transport in the atmosphere than the local emissions. However, it is impossible to accurately analyze the direct effects of long-range transport on an increase in the ground-level ozone concentration considering that there is not a sufficient amount of chemical measurements and vertical weather and air quality information. Therefore, it is not possible to rule out a contribution of other mechanical effects. On that account, it is imperative to conduct vertical observations on the weather and the concentration of main air pollutants in a target area for a more accurate analysis. In addition, it is essential to analyze the relationship between the pollutant concentration and various epidemiological factors obtained from observation data. Furthermore, it would also be required to identify the transport mechanism and conduct a quantitative analysis research through the photochemical transport modeling.