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Negative NAO as a precursor of SSW events evolving from displacement type to split type

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Title
Negative NAO as a precursor of SSW events evolving from displacement type to split type
Other Titles
이동유형에서 분리유형으로 전개되는 성층권 돌연승온 사례의 전조로서 음의 북대서양진동
Authors
Choi, Hyesun
Choi, Wookap
Kim, Seong-Joong
Kim, Baek-Min
Keywords
NAO; Precursor; SSW
Issue Date
2019
Citation
Choi, Hyesun, et al. 2019. Negative NAO as a precursor of SSW events evolving from displacement type to split type. 2019 KMS(Korean Meteorological Society) Fall Meeting. Gyeongju Hwabaek International Convention Center (HICO). 2019.10.30~2019.11.01.
Abstract
Sudden stratospheric warming (SSW) events preceded by a displacement in polar vortex center are characterized by whether they retain their displaced form or split into two vortices after onset. Here, we show that a change in type during the course of the SSW life cycle can be attributed to differences in the tropospheric geopotential height (GPH) distribution in the North Atlantic. Positive geopotential height anomalies in the north and negative anomalies in the south of the North Atlantic, which resemble the negative North Atlantic Oscillation (NAO) pattern, occur more frequently before the onset of displacement-split type SSW events compared with those that do not exhibit this transition. The geopotential height differences seem to result in distinct tropospheric-stratospheric dynamical coupled processes; the anomalous planetary wave pattern favors vertical propagation during the negative NAO, which decelerates the westerly wind in the high-latitude lower stratosphere. More than 178 SSW events obtained by 350 years of simulated current climate using the atmospheric general circulation model also support these observations. Therefore, NAO can be regarded as a useful predictor for determining the type of forthcoming SSW events.
URI
https://repository.kopri.re.kr/handle/201206/12613
Conference Name
2019 KMS(Korean Meteorological Society) Fall Meeting
Conference Place
Gyeongju Hwabaek International Convention Center (HICO)
Conference Date
2019.10.30~2019.11.01
Appears in Collections  
2019-2019, Development and Application of the Korea Polar Prediction System (KPOPS) for Climate Change and Disasterous Weather Events (19-19) / Kim, Joo-Hong (PE19130)
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