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Topographical effect of the Antarctic Peninsula on a strong wind event

Published online by Cambridge University Press:  20 October 2021

Hataek Kwon Open the ORCID record for Hataek Kwon [Opens in a new window] ,
Seong-Joong Kim ,
Sang-Woo Kim  and
Sinu Kim
Hataek Kwon
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul, Republic of Korea
Seong-Joong Kim*
Affiliation:
Division of Polar Climate Sciences, Korea Polar Research Institute, Incheon, Republic of Korea
Sang-Woo Kim
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul, Republic of Korea
Sinu Kim
Affiliation:
Weather Lab, Seoul, Republic of Korea
*
seongjkim@kopri.re.kr
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Abstract

The topographical effect on a strong wind event that occurred on 7 January 2013 at King Sejong Station (KSJ), Antarctica, was investigated using the Polar Weather Research and Forecasting (WRF) model. Numerical experiments applying three different terrain heights of the Antarctic Peninsula (AP) were performed to quantitatively estimate the topographical effect on the selected strong wind event. The experiment employing original AP topography successfully represented the observed features in the strong wind event, both in terms of peak wind speed (by ~94%; ~19.7 m/s) and abrupt transitions of wind speed. In contrast, the experiment with a flattened terrain height significantly underestimated the peak wind speeds (by ~51%; ~10.4 m/s) of the observations. An absence of AP topography failed to simulate both a strong discontinuity of sea-level pressure fields around the east coast of the AP and a strong south-easterly wind over the AP. As a result, the observed downslope windstorm, driven by a flow overriding a barrier, was not formed at the western side of the AP, resulting in no further enhancement of the wind at KSJ. This result demonstrates that the topography of the AP played a critical role in driving the strong wind event at KSJ on 7 January 2013, accounting for ~50% of the total wind speed.

Keywords

downslope windstormKing Sejong Stationpolar WRFtopography
Type
Physical Sciences
Information
Antarctic Science , Volume 33 , Issue 6 , December 2021 , pp. 674 - 684
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Copyright
Copyright © Antarctic Science Ltd 2021

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