A numerical simulation of a strong wind event in January 2013 at King Sejong station, Antarctica
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- A numerical simulation of a strong wind event in January 2013 at King Sejong station, Antarctica
- Other Titles
- 2013년 세종기지 강풍 사례 수치모델 재현 비교연구
- Kwon, Hataek
- Numerical simulation; Sejong Station; Strong Wind
- Issue Date
- Kwon, Hataek, et al. 2019. "A numerical simulation of a strong wind event in January 2013 at King Sejong station, Antarctica". QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 145(720): 1267-1280.
- A strong wind event (SWE), so-called “severe gale”, with a 10 min average wind
speed of above 22m/s occurred on 7 January 2013 at the King Sejong station (KSJ)
on the tip of the Antarctic Peninsula (AP). We examine the cause of the SWE and
assess the short-term predictability of such an event, using the state-of-the-art Polar
Weather Research and Forecasting (Polar WRF) model. The simulation results, initialized
at 0000UTC 6 January 2013, the day prior to the occurrence of the SWE,
produce the most accurate representation of the SWE in terms of strength (∼94% of
the peak wind speed). Both model results and observational records reveal that the
SWE ismainly caused by the approach of a deep depression with the central pressure
of 950 hPa. On top of this synoptic configuration, a particular shape of topography of
the AP plays a non-negligible role for further intensification of the wind at KSJ. As
the cyclone approaches theAP, the sea-level pressure becomes lower and is deformed
around the AP due to the topography, driving southeasterly winds traversing the AP.
The continuous flow overriding the AP generates a downslope windstorm at the lee
side of the AP. The windstorm effect driven by the deformation of sea-level pressure
by the topography of the AP is not properly represented in the coarser-resolution
(27 km) model domain compared with higher (3 and 9 km) resolutions. We conclude
that the SWE at KSJ on 7 January 2013 is caused by the combined effect of a
synoptic-scale low-pressure system with local topography of the AP.
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