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2021년 3월 YES-AQ 기간 중 선박과 항공기로 관측한 서해상 황사 특성

Characteristics of Asian Dust Observed over the Yellow Sea during YES-AQ Campaign in March, 2021 based on Vessel 

and Aircraft Measurement 

Abstract 

The meteorological and aerosol characteristics of heavy dust during the 2021 YES-AQ campaign were analyzed. The source 

region of Asian Dust were sufficiently warm and dry, which is a proper condition for dust particles to be well intruded from 

the surface into the air above. Asian dust transported to the Shandong peninsula in China by the northwesterly, and then

flowed into the Korean peninsula by the westerly. When the fine-mode aerosol is dominated in the period before arrival of

Asian dust, scattering mass efficiency of PM10 was 5.3 m2/g and secondary pollutants such as sulfate, nitrate, and 

ammonium accountd for 50% of the total PM10 mass concentration. During the heavy dust period, PM10 mass 

concentration was maintained at 676~1,384 μg/m3 for about 24 hours from 21 KST on March 29, 2021 which is 25 times

higher than the PM10 mass concentration before the Asian dust arrived. The light absorption coefficient in the heavy dust

period was 38.5±9.4 Mm-1, which was higher than in the period before the arrival of Asian dust (22.5±10.2 Mm-1)

confirming the Asian dust was highly absorbing. The scattering Ångström exponent and absorption Ångström exponent

were 0.29 and 2.64, respectively, which are similar to the values reported around the Asian Dust source region. Although

the concentration of fine particles did not increase during HD, it is presumed that the Asian Dust and fine particles were

combined as the concentration of ions of anthropogenic pollutants increased to 15 μg/m3. Aerosol physical and optical

properties were observed at 0.5~5.0 km over the Yellow Sea using an aircraft during HD. The coarse particle concentration

and light scattering coefficient (545.7 Mm-1) and the light absorption coefficient (23.1 Mm-1) were the highest at the

altitude of 0.9 km (36.5°N, 124.4°E). The scattering Ångström exponent (-0.067±0.13) and the absorption Ångström

exponent (1.3~1.9) showed distinct characteristics of dust. The vertical lapse rate of the temperature from the aircraft and

the backward trajectory analysis declared that the air origins were different below and over the altitude of 1.8 km.     

Key words 

Asian dust, Yellow Sea, YES-AQ, Aerosol, Aircraft measurement

▶출처 : 한국대기환경학회지 제 38권 제 4호, 2022.08 pp. 557-576