Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 17, 1425-1435, 2017
https://doi.org/10.5194/nhess-17-1425-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
29 Aug 2017
Identification of atmospheric transport and dispersion of Asian dust storms
Raegyung Ha1, Amarjargal Baatar2, and Yongjae Yu1,2 1Department of Astronomy, Space Science, and Geology, Chungnam National University, Daejeon, 34134, Korea
2Department of Geology & Environmental Sciences, Chungnam National University, Daejeon, 34134, Korea
Abstract. Backward trajectories of individual Asian dust storm (ADS) events were calculated using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) at four representative stations in Korea. A total of 743 ADS events and associated 2229 (endings of altitudes at 1000, 1500, and 2000 m per ADS event) backward trajectories from four stations were traced from January 2003 to August 2015. Regardless of the locations of the observed stations and the threshold time divide, a recent increase in the ADS occurrence rate was statistically significant with a 99.9 % confidence limit. Winter and spring were high-occurrence seasons for the ADS, while it rarely occurred in summer. Angular distributions of dust transport indicated a dominance of northwesterly wind, as more than two-thirds of ADS events are azimuthally confined from 290 to 340°. In addition, there is a tendency for stronger PM10 dust air concentration to be from the northwest. We found a strong inverse correlation between the number of days with ADS events and cumulative PM10 dust air concentration, indicating that the total amount of cumulative PM10 discharge was rather constant over time. If so, relatively shorter transport distances and a more continental dust passage over the Shandong peninsular would yield less PM10 in a shorter transport path but with a stronger concentration.

Citation: Ha, R., Baatar, A., and Yu, Y.: Identification of atmospheric transport and dispersion of Asian dust storms, Nat. Hazards Earth Syst. Sci., 17, 1425-1435, https://doi.org/10.5194/nhess-17-1425-2017, 2017.
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Short summary
A total of 743 Asian dust storm (ADS) events from January 2003 to August 2015 were analyzed using backward trajectory HYSPLIT models to gain insight into the dust generation and transport in eastern Asia. Spatial distribution of ADS events is northwesterly, as more than two-thirds of ADS events are azimuthally confined. The total amount of cumulative PM10 discharge was rather constant over time in Korea, as there is an inverse correlation between ADS occurrence and PM10 dust air concentration.
A total of 743 Asian dust storm (ADS) events from January 2003 to August 2015 were analyzed...
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