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http://dx.doi.org/10.5467/JKESS.2022.43.3.386

A Case Study of the Heavy Asian Dust Observed in May 2011  

Ahn, Bo-Yeong (High Impact Weather Research Laboratory, Forecast Research Department, National Institute of Meteorological Sciences)
Lim, Byunghwan (High Impact Weather Research Laboratory, Forecast Research Department, National Institute of Meteorological Sciences)
Publication Information
Journal of the Korean earth science society / v.43, no.3, 2022 , pp. 386-404 More about this Journal
Abstract
From April 29 to 30, 2011, under the influence of Asian dust originated from Mongolia, a high concentration of Asian dust was observed nationwide for 4 days in Korea. This study investigated the causes and characteristics of and weather conditions associated with Asian dust at high concentrations at its source in Mongolia. For analysis, Asian dust weather data, Asian dust monitoring tower data, satellite data, backward trajectory data, observation data (PM10 and OPC data), and ECMWF reanalysis data were used. In the synoptic analysis, it was observed that the intervals of isobars were densely distributed in the central region of Mongolia and the pressure gradient force was strong. It could be inferenced that Asian dust occurred due to strong winds. The temperature was relatively high, above 10℃, just before the occurrence of Asian dust, and it decreased sharply at the onset of the dust. The relative humidity had a low value of less than approximately 40%. After the occurrence of Asian dust, it increased sharply to over 50% and then showed a tendency to decrease. In the aerosol index shown by the COMS satellite, a high concentration value of over 25 was detected in Inner Mongolia, and it was consistent with the observations made with naked eyes. In the 72-hour backward trajectory, the northwest airflow streamed into Korea, and on May 2, Heuksando showed the highest PM10 concentration of 1,025 ㎍ m-3(times the average). Especially, in kinematic vertical analysis, it was observed that low pressure on the ground was strengthened by cyclonic relative vorticity developed in the upper layer. Also, the vertical velocity development is considered to have played a major role in the occurrence of high concentration Asian dust.
Keywords
Asian dust; Asian dust monitoring tower; $PM_{10}$; COMS;
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Times Cited By KSCI : 3  (Citation Analysis)
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