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Dependence of sudden stratospheric warming type­transition on preceding North Atlantic Oscillation conditions

Cited 2 time in wos
Cited 2 time in scopus
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Title
Dependence of sudden stratospheric warming type­transition on preceding North Atlantic Oscillation conditions
Other Titles
선행하는 북대서양 진동 조건에 따른 성층권 돌연승온 유형 전이의 의존성
Authors
Choi, Hyesun
Choi, Wookap
Kim, Seong-Joong
Kim, Baek-Min
Subject
Geochemistry & Geophysics; Meteorology & Atmospheric Sciences
Keywords
North Atlantic oscillation; precursor; sudden stratospheric warming; tropospheric-stratospheric dynamical processes; type-transition
Issue Date
2020-03
Citation
Choi, Hyesun, et al. 2020. "Dependence of sudden stratospheric warming type­transition on preceding North Atlantic Oscillation conditions". ATMOSPHERIC SCIENCE LETTERS, 21(3): 1-8.
Abstract
Most sudden stratospheric warming (SSW) events initiate with their centers being displaced from the pole. Some retain their displaced form until termination but some split into two vortices during their course. Here, we show that existence of a transition during the course of the SSW life cycle can be attributable to the condition of North Atlantic Oscillation (NAO) preceding before onset: Positive NAO favors SSW of displacement type with no transition while negative NAO favors the displacementsplit type. We show that, in positive NAO precondition, vertical flux of wave activity immediately before onset is mostly contributed only by wavenumber 1 component, which contrasts with the relatively stronger contribution of wavenumber 2 in negative NAO precondition. Whole Atmosphere Community Climate Model (WACCM) simulation results are also consistent with the observational findings. Therefore, NAO can be regarded as a useful precursor for determining the type of forthcoming SSW events.
URI
https://repository.kopri.re.kr/handle/201206/11981
DOI
http://dx.doi.org/10.1002/asl.953
Appears in Collections  
2020-2020, Assessment for the extreme weather and climate change in Antarctica and its global influence (20-20) / Kim, Seong-Joong (PE20070)
2020-2020, Earth System Model-based Korea Polar Prediction System (KPOPS-Earth) Development and Its Application to the High-impact Weather Events originated from the Changing Arctic Ocean and Sea Ice (20-20) / Kim, Joo-Hong (PE20090)
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