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Open AccessArticle

Influence of Quasi-Periodic Oscillation of Atmospheric Variables on Radiation Fog over A Mountainous Region of Korea

1
Department of Atmospheric Sciences, Yonsei University, Seoul 03722, Korea
2
Meteorological Research Division, Environment and Climate Change Canada, Toronto, ON M3H 5T4, Canada
3
Applied Meteorology Research Division, NIMS/KMA, Seogwipo-si, Jeju-do 63568, Korea
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(3), 230; https://doi.org/10.3390/atmos11030230
Received: 5 February 2020 / Revised: 21 February 2020 / Accepted: 24 February 2020 / Published: 27 February 2020
(This article belongs to the Special Issue Observation, Simulation and Predictability of Fog )
To enhance our understanding of fog processes over complex terrain, various fog events that occurred during the International Collaborative Experiments for Pyeongchang 2018 Winter Olympics and Paralympics (ICE-POP) campaign were selected. Investigation of thermodynamic, dynamic, and microphysical conditions within fog layers affected by quasi-periodic oscillation of atmospheric variables was conducted using observations from a Fog Monitor-120 (FM-120) and other in-situ meteorological instruments. A total of nine radiation fog cases that occurred in the autumn and winter seasons during the campaign over the mountainous region of Pyeongchang, Korea were selected. The wavelet analysis was used to study quasi-period oscillations of dynamic, microphysical, and thermodynamic variables. By decomposing the time series into the time-frequency space, we can determine both dominant periods and how these dominant periods change in time. Quasi-period oscillations of liquid water content (LWC), pressure, temperature, and horizontal/vertical velocity, which have periods of 15–40 min, were observed during the fog formation stages. We hypothesize that these quasi-periodic oscillations were induced by Kelvin–Helmholtz instability. The results suggest that Kelvin–Helmholtz instability events near the surface can be explained by an increase in the vertical shear of horizontal wind and by a simultaneous increase in wind speed when fog forms. In the mature stages, fluctuations of the variables did not appear near the surface anymore. View Full-Text
Keywords: Kelvin Helmholtz Instability; orographic fogs; fog microphysics measurement Kelvin Helmholtz Instability; orographic fogs; fog microphysics measurement
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MDPI and ACS Style

La, I.; Yum, S.S.; Gultepe, I.; Yeom, J.M.; Song, J.I.; Cha, J.W. Influence of Quasi-Periodic Oscillation of Atmospheric Variables on Radiation Fog over A Mountainous Region of Korea. Atmosphere 2020, 11, 230.

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