백령도, 문산, 군산의 라이다로 측정한 에어로졸 연직분포-2010년 5월 10~11일 황사를 중심으로-
Aerosol Vertical Distribution Measured by LIDARs in Baengnyeongdo, Munsan, and Gunsan during 10~11 May 2010
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초록
This study aims to analyze the vertical distribution of Asian dust measured byLIDARs at three weather stations in Baengnyeongdo (BND), Munsan (MS), and Gunsan (GS)during 10~11 May 2010, and thereby investigate their effectiveness. Asian dust passed throughfrom central to south-western part of Korea. Although dust particles were detected over thesurface in MS and GS, LIDAR data showed that the Asian dust with non-spherical particleswas observed in all of the three regions. It seems that the naked-eye observation could notdetect dust over the surface of BND due to the temperature inversion below a height of0.45 km. During the Asian dust events, the duration time of dust presented 9.5 hr (BND),19.5 hr (MS), and 24.5 hr (GS), respectively with the longest time in GS, whereas dust altitudesranged from 0.4 to 1.3 km (BND), 0.1 to 2.8 km and 4.1 to 4.2 km (MS), and 0.2 to2.0 km (GS), respectively, while showing the highest altitude in MS. Aerosol optical thickness(AOT) retrieved by LIDAR and skyradiometer (SR), located close to the LIDAR sites, wascompared. MS (LIDAR) and Seoul (SR) attained the AOT of 0.64 and 0.50, and GS (LIDAR)and Gongju (SR) attained the AOT of 0.38 and 0.54, respectively. As SR-derived angstromexponents (AE) during the time period determined as Asian dust by LIDAR data were 0.17 inSeoul (near MS) and 0.30 in Gongju (near GS), it can be said that the characteristics of dustparticles were appeared. During the study period, depolarization ratio could serve as a usefulindicator to determine dust aerosol. But, it still seems essential to conduct further investigationwith longer period of data to better describe the discrepancy of AOT between LIDARs and SR.
Abstract
This study aims to analyze the vertical distribution of Asian dust measured byLIDARs at three weather stations in Baengnyeongdo (BND), Munsan (MS), and Gunsan (GS)during 10~11 May 2010, and thereby investigate their effectiveness. Asian dust passed throughfrom central to south-western part of Korea. Although dust particles were detected over thesurface in MS and GS, LIDAR data showed that the Asian dust with non-spherical particleswas observed in all of the three regions. It seems that the naked-eye observation could notdetect dust over the surface of BND due to the temperature inversion below a height of0.45 km. During the Asian dust events, the duration time of dust presented 9.5 hr (BND),19.5 hr (MS), and 24.5 hr (GS), respectively with the longest time in GS, whereas dust altitudesranged from 0.4 to 1.3 km (BND), 0.1 to 2.8 km and 4.1 to 4.2 km (MS), and 0.2 to2.0 km (GS), respectively, while showing the highest altitude in MS. Aerosol optical thickness(AOT) retrieved by LIDAR and skyradiometer (SR), located close to the LIDAR sites, wascompared. MS (LIDAR) and Seoul (SR) attained the AOT of 0.64 and 0.50, and GS (LIDAR)and Gongju (SR) attained the AOT of 0.38 and 0.54, respectively. As SR-derived angstromexponents (AE) during the time period determined as Asian dust by LIDAR data were 0.17 inSeoul (near MS) and 0.30 in Gongju (near GS), it can be said that the characteristics of dustparticles were appeared. During the study period, depolarization ratio could serve as a usefulindicator to determine dust aerosol. But, it still seems essential to conduct further investigationwith longer period of data to better describe the discrepancy of AOT between LIDARs and SR.
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