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24. Corrigendum

Author

Park, Chanil, primary, Son, Seok-Woo, additional, Kim, Joowan, additional, Chang, Eun-Chul, additional, Kim, Jung-Hoon, additional, Jo, Enoch, additional, Cha, Dong-Hyun, additional, and Jeong, Sujong, additional

Published
2022
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26. Importance of Diabatic Heating for the Eastward-Moving Heavy Rainfall Events along the Yangtze River, China.

Author

Zhao, Yang, Park, Chanil, and Son, Seok-Woo

Subjects
*VERTICAL motion, *WATERSHEDS, *HEATING, *BUDGET, *VORTEX motion
Abstract

This study highlights the importance of the diabatic process in the heavy rainfall events (HREs) that are initiated on the eastern slope of the Tibetan Plateau and move to the lower reaches of the Yangtze River basin. These HREs, which cause significant socioeconomic losses in the Yangtze River basin, are typically maintained for 3 days. They develop when a large amount of moisture converges on the eastern slope of the Tibetan Plateau. By solving the quasigeostrophic (QG) omega equation, it is revealed that the vertical motion of HREs is organized by both dynamic and diabatic forcings, with the latter being dominant. The stationary boundary forcing on the eastern slope of the Tibetan Plateau also contributes to the initial organization of the HREs. While the dynamic vertical motion does not change much and the boundary forcing becomes negligible after the initial organization, diabatic vertical motion becomes more dominant in QG vertical motion (∼80%) as HREs develop and move downstream. The potential vorticity (PV) tendency budget analysis reveals that the development and eastward movement of the HRE-related surface cyclone is primarily associated with diabatic PV production to the east of the cyclone where a large amount of moisture converges. This result implies that the long-traveling HREs along the Yangtze River basin are highly self-maintaining in nature. [ABSTRACT FROM AUTHOR]

Published
2023
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34. Enhanced thermal diffusion in the vertical direction of flexible polyimide composite films with magnetically alignable h-BN platelets viaferrofluids hybridization

Author

Song, Hee Seok, Park, Chanil, Bae, Youn-Sang, Kim, Yong Seok, Lim, Ho Sun, and Yoo, Youngjae

Abstract

A facile approach is proposed to improve the anisotropic heat conduction of polyimide composite films containing hexagonal boron nitride (h-BN), thermally conductive filler with high anisotropy, viasurface hybridization with ferrofluids as magnetic carrier source. The surfaces of the h-BNs were decorated with Fe3O4particles to control their alignment using magnetic field. The h-BNs with hydroxyl groups (f-BN) were mixed with ferrofluids and heated to 130 °C with stirring. A considerable amount of Fe3O4nanoparticles was attached to the surface of f-BNs, named mf-BNs. Flexible polyimide (PI) composite films were prepared by adding mf-BNs at 1–30 wt.% to investigate the anisotropic alignment of mf-BNs under magnetic field. The thru-plane thermal conductivity of the PI composite film with vertically aligned mf-BN of 30 wt.% is 6 times higher than that of the neat PI film, as increased from 0.212 to 1.246 W/m∙K. This result is attributed to the anisotropic h-BN particles coated with the magnetic fluid arranged within the PI matrix in the vertical direction by using a neodymium magnet with less than 150 mT. This can solve the thermal issues of next-generation electronics by speeding the vertical heat transfer, which can greatly contribute to the improvement of the device reliability.

Published
2022
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38. Record-Breaking Summer Rainfall in South Korea in 2020: Synoptic Characteristics and the Role of Large-Scale Circulations.

Author

Park, Chanil, Son, Seok-Woo, Kim, Hera, Ham, Yoo-Geun, Kim, Joowan, Cha, Dong-Hyun, Chang, Eun-Chul, Lee, GyuWon, Kug, Jong-Seong, Lee, Woo-Seop, Lee, Yun-Young, Lee, Hee Choon, and Lim, Byunghwan

Subjects
*MONSOONS, *NORTH Atlantic oscillation, *CYCLONES, *SUMMER
Abstract

In the summer of 2020, South Korea experienced record-breaking rainfall due to 15 consecutive heavy rainfall events (HREs) from mid-June to early September. Among them, 11 HREs occurred in late June to mid-August with distinct synoptic characteristics depending on the occurrence period. All HREs from 29 June to 27 July (P1) were triggered by extratropical cyclones, while those from 28 July to 15 August (P2) mainly occurred along the monsoon rainband. We argue that their transition is associated with atmospheric teleconnections. During P1, the western North Pacific subtropical high (WNPSH) anomalously extended westward, but its northward expansion was hindered by the meridional wave train from the suppressed convection over the South China Sea. This condition prevented a northward migration of the monsoon rainband but allowed more extratropical cyclones to pass over the Korean Peninsula, resulting in four HREs. During P2, the South China Sea convection was enhanced, and its circulation response prompted an abrupt northward expansion of the WNPSH with a large pressure gradient along its northern boundary. With intensified southwesterly moisture transport, a monsoon rainband was activated over the Korean Peninsula, producing six HREs. The opposite phases of the summer North Atlantic Oscillation, i.e., negative in P1 but positive in P2, further contributed to the anomalous monsoon circulation by modulating the midlatitude circulation response to the South China Sea convection. This study demonstrates that the nature of summertime HREs in East Asia can be strongly modulated by remote forcings. [ABSTRACT FROM AUTHOR]

Published
2021
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