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In this study, we investigated the daily variability of PM 10 concentrations in January in Korea during the past 19 years (2001–2019), as well as the associated atmospheric circulation patterns. The daily PM 10 concentrations were classified into three cases: low (L; < 50 μg/m3), high (H; 50–100 μg/m3), and extremely high (EH; ≥ 100 μg/m3). We found that the strength of the East Asian winter monsoon influenced the PM 10 variability in the L and H cases. However, the EH cases were strongly influenced by the rapid growth of barotropic warming (anticyclonic anomaly) over the eastern North Atlantic and Northern Europe (ENE), and the stationary Rossby waves grew rapidly over Eurasia within only four days. Analysis of the quasi-geostrophic geopotential tendency budget revealed that the anticyclonic anomaly over the ENE was enhanced by vorticity advection. Linear baroclinic model experiments confirmed that vorticity forcing over the ENE induces favorable atmospheric conditions for the occurrence of EH PM 10 events in East Asia. As a result, the PM 10 concentration sharply increased sharply by approximately three times over four days. This study suggests that understanding atmospheric teleconnections between the ENE and East Asia can effectively predict the occurrence of EH PM 10 events in Korea, helping to reduce the human health risks from atmospheric pollution. [Display omitted] • Extremely high PM 10 (EH) cases are associated with atmospheric stagnant pattern. • In EH cases, the PM 10 concentration increased about 3 time in 4 days. • Stagnant patterns with EH cases are affected by the North Atlantic forcing. • North Atlantic anticyclonic anomaly forcing is developed by a vorticity advection. • The EH cases are induced by stagnant pattern through the Rossby wave propagation. [ABSTRACT FROM AUTHOR]

Park, Y.H. and Youn, D., 2020. The study of a new tidal power for a practical use. In: Malvárez, G. and Navas, F. (eds.), Global Coastal Issues of 2020. Journal of Coastal Research, Special Issue No. 95, pp. 1500–1504. Coconut Creek (Florida), ISSN 0749-0208. Dynamic Tidal Power (DTP), a kind of tidal power was first developed 20 years ago but it has never been actually built. Because DTP generates power using the diffraction effect of tides, it requires very long and large structures considering tidal period. Economic feasibility is most demanded for a practical use and various studies have been conducted to increase its output. Different shape and length DTPs had been tested in a previous study but they were not economical. For this reason, other ways were simulated to increase power generation in the study. Multiple and slit-type DTPs were chosen. It was found that the proper spacing between DTP structures was necessary for efficient power generation considering tidal diffraction effect. Because the intensity of light is varied as it passes through a single slit, a slit-type DTP was analyzed. The result from a slit-type DTP was failed to improve capacity but it was similar to those of a straight DTP. Because a slit-type DTP required less structure, it would be more economical and environmentally friendly. The study area was located in the west central coast of Korea where the tidal range was the largest and water depth was shallow. The simulations were conducted by the two dimensional numerical model ADCIRC. [ABSTRACT FROM AUTHOR]