当前位置: X-MOL 学术J. Geophys. Res. Space Phys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming
Journal of Geophysical Research: Space Physics ( IF 2.6 ) Pub Date : 2021-04-30 , DOI: 10.1029/2020ja028909
Guiping Liu 1, 2, 3 , Diego Janches 3 , Ruth S. Lieberman 3 , Tracy Moffat‐Griffin 4 , Nicholas J. Mitchell 4, 5 , Jeong‐Han Kim 6 , Changsup Lee 6
Affiliation  

Sudden stratospheric warmings (SSWs) could act as an important mediator in the vertical coupling of atmospheric regions and dramatic variations in the mesosphere and lower thermosphere (MLT) in response to SSWs have been documented. However, due to rare occurrences, SSWs in the Southern Hemisphere (SH) and their impacts on the MLT dynamics are not well understood. This study presents an analysis of MLT winds at ∼80–98 km altitudes measured by meteor radars located at Tierra del Fuego (53.7°S, 67.7°W), King Edward Point (54.3°S, 36.5°W) and King Sejong Station (62.2°S, 58.8°W) near 60°S latitude during the Antarctic winter. Eastward zonal winds from these stations are observed to decrease significantly near the peak date of the 2019 Antarctic SSW, and both zonal and meridional winds in 2019 exhibit considerable differences to the mean winds averaged over other non‐SSW years. A quasi 6‐day oscillation is observed at all three radar locations, being consistent with the presence of the westward propagating zonal wave‐1 planetary wave. The vertical wavelength of this wave is estimated to be ∼55 km, and the enhancement of the wave amplitude during this SSW is noticeable. Evidence of the interaction between the 6‐day wave and the semidiurnal diurnal tide is provided, which suggests a possible mechanism for SSWs to impact the upper atmosphere. This study reports the large‐scale variations in winds in the MLT region at SH midlatitudes to high latitudes in a key dynamic but largely unexplored latitudinal band in response to the 2019 Antarctic SSW.

中文翻译:

在2019年南极突然发生的平流层变暖期间,中纬度和下热圈近60°S的风向变化

平流层突然变暖(SSWs)可能是大气区域垂直耦合的重要媒介,并且已有文献记录中层和低热层(MLT)响应于SSWs的剧烈变化。然而,由于罕见的发生,人们对南半球(SH)的SSW及其对MLT动力学的影响还知之甚少。这项研究提出了由位于火地岛(53.7°S,67.7°W),爱德华角国王(54.3°S,36.5°W)和世宗国王站的流星雷达测得的〜80-98 km高度的MLT风的分析南极冬季,纬度60°S附近(62.2°S,58.8°W)。观测到这些台站向东的纬向风在2019年南极西南偏南峰的顶峰日期附近明显减少,2019年的纬向和经向风与其他非西南南纬年份的平均风均表现出相当大的差异。在所有三个雷达位置都观测到准6天的振荡,这与向西传播的纬向波-1行星波的存在一致。该波的垂直波长估计约为55 km,在此SSW期间波幅的增强是明显的。提供了为期六天的波浪和半日昼潮之间相互作用的证据,这表明南半球影响高层大气的一种可能机制。这项研究报告了响应于2019年南极南海SSW的关键动态但很大程度上未开发的纬度带,SH中纬度MLT地区到高纬度的风向发生了大范围变化。在所有三个雷达位置都观测到准6天的振荡,这与向西传播的纬向波-1行星波的存在一致。该波的垂直波长估计约为55 km,在此SSW期间波幅的增强是明显的。提供了为期六天的波浪和半日昼潮之间相互作用的证据,这表明南半球影响高层大气的一种可能机制。这项研究报告了响应于2019年南极南海SSW的关键动态但很大程度上未开发的纬度带,SH中纬度MLT地区到高纬度的风向发生了大范围变化。在所有三个雷达位置均观测到准6天的振荡,这与向西传播的纬向波-1行星波的存在一致。该波的垂直波长估计约为55 km,在此SSW期间波幅的增强是明显的。提供了为期六天的波浪与半日昼夜潮之间相互作用的证据,这表明南半球影响上层大气的一种可能机制。这项研究报告了响应于2019年南极南海SSW的关键动态但很大程度上未开发的纬度带,SH中纬度MLT地区到高纬度的风向发生了大范围变化。该波的垂直波长估计约为55 km,在此SSW期间波幅的增强是明显的。提供了为期六天的波浪和半日昼潮之间相互作用的证据,这表明南半球影响高层大气的一种可能机制。这项研究报告了响应于2019年南极南海SSW的关键动态但很大程度上未开发的纬度带,SH中纬度MLT地区到高纬度的风向发生了大范围变化。该波的垂直波长估计约为55 km,在此SSW期间波幅的增强是明显的。提供了为期六天的波浪和半日昼潮之间相互作用的证据,这表明南半球影响高层大气的一种可能机制。这项研究报告了响应于2019年南极南海SSW的关键动态但很大程度上未开发的纬度带,SH中纬度MLT地区到高纬度的风向发生了大范围变化。
更新日期:2021-05-08
down
wechat
bug