受极光重力波影响的中尺度天气是否有助于条件对称不稳定性的释放?

Q2 Earth and Planetary Sciences Advances in Science and Research Pub Date : 2024-07-15 DOI:10.5194/asr-21-1-2024
P. Prikryl
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引用次数: 0

摘要

摘要。我们在太阳风与磁层-电离层-大气层系统耦合的背景下,通过极光激发的大气重力波,考虑了对恶劣天气发生的可能影响。来自日冕洞的太阳风高速流导致高纬度电离层电流增强,从而引发重力波在上下大气层传播。虽然这些重力波到达对流层时的振幅会大大减弱,但它们可以促进条件对称不稳定的释放和风暴的加剧。包括冬季风暴和造成洪水和山洪暴发的强降雨在内的恶劣天气事件显示出一种趋势,即太阳风高速流从日冕洞到达后,太阳风高速流也会随之到达。ERA5再分析用于评估斜向对流的可用势能和可实现的对称不稳定性的垂直综合范围,以评估在严重暴风雪和山洪暴发期间,外热带气旋锋面区发生斜向对流的可能性。在这些区域观测到的低层偏南风和高风切变是下行极光激发重力波过度反射的有利条件,有可能导致有条件的对称不稳定性释放,从而导致斜向对流和高速降水。
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Mesoscale weather influenced by auroral gravity waves contributing to conditional symmetric instability release?
Abstract. We consider possible influence on severe weather occurrence in the context of solar wind coupling to the magnetosphere–ionosphere–atmosphere system, mediated by aurorally excited atmospheric gravity waves. Solar wind high-speed streams from coronal holes cause intensifications of ionospheric currents at high latitudes launching gravity waves propagating in the upper and lower atmosphere. While these gravity waves reach the troposphere with much attenuated amplitudes, they can contribute to conditional symmetric instability release and intensification of storms. Severe weather events, including winter storms and heavy rainfall causing floods and flash floods, show a tendency to follow arrivals of solar wind high-speed streams from coronal holes. The ERA5 re-analysis is used to evaluate slantwise convective available potential energy and vertically integrated extent of realizable symmetric instability to assess the likelihood of slantwise convection in frontal zones of extratropical cyclones during severe snowstorms and flash floods. The observed low-level southerly winds and high wind shears in these regions are favorable conditions for over-reflection of down-going aurorally excited gravity waves potentially contributing to conditional symmetric instability release leading to slantwise convection and high-rate precipitation.
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来源期刊
Advances in Science and Research
Advances in Science and Research Earth and Planetary Sciences-Geophysics
CiteScore
4.10
自引率
0.00%
发文量
13
审稿时长
22 weeks
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