Middle‐ and High‐Latitude Mesosphere and Lower Thermosphere Mean Winds and Tides in Response to Strong Polar‐Night Jet Oscillations
Middle‐ and High‐Latitude Mesosphere and Lower Thermosphere Mean Winds and Tides in Response to Strong Polar‐Night Jet Oscillations
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中高纬度中间层和低热层平均风和潮汐对极夜强烈急流振荡的响应
DOI：
10.1029/2019jd030828
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
D. Peters
中科院分区：
文献类型：
--
作者：
J. F. Conte;J. Chau;D. Peters
详细描述了在强烈扰动的冬季条件下（通常称为极夜急流振荡（PJO））中间层和低热层（MLT）区域的动力学行为，并与其他冬季条件进行了比较。为此目的，使用位于Andenes（69°N，16°E）和Juliusruh（54°N，13°E）的两个镜面流星雷达提供的风测量值来估计水平平均风和潮汐，作为观测基础。分析和比较了三种不同情况下的风和潮汐的主要特征：主要的平流层突然变暖（SSW）（a）强PJO事件，（B）非PJO事件，（c）没有主要的SSW。我们表明，强PJO，非PJO和没有主要SSW的冬季的区别更适合于识别北方冬季平均风和潮汐行为的差异。为了评估平流层扰动条件对MLT区域的影响，我们研究了扩展的加拿大中层大气模式的30年轻推模拟。位势高度扰动的分析表明，在中间层高度的极涡的位置的变化是负责在MLT的平均风在强PJO，这反过来又影响半日潮的演变增加或减少其幅度取决于潮汐分量的射流。
The dynamical behavior of the mesosphere and lower thermosphere (MLT) region during strongly disturbed wintertime conditions commonly known as polar‐night jet oscillations (PJOs) is described in detail and compared to other wintertime conditions. For this purpose, wind measurements provided by two specular meteor radars located at Andenes (69°N, 16°E) and Juliusruh (54°N, 13°E) are used to estimate horizontal mean winds and tides as an observational basis. Winds and tidal main features are analyzed and compared for three different cases: major sudden stratospheric warming (SSW) with (a) strong PJO event, (b) non‐PJO event, and (c) no major SSWs. We show that the distinction into strong PJOs, non‐PJOs, and winters with no major SSWs is better suited to identify differences in the behavior of the mean winds and tides during the boreal winter. To assess the impact of the stratospheric disturbed conditions on the MLT region, we investigate the 30‐year nudged simulation by the Extended Canadian Middle Atmosphere Model. Analysis of geopotential height disturbances suggests that changes in the location of the polar vortex at mesospheric heights are responsible for the jets observed in the MLT mean winds during strong PJOs, which in turn influence the evolution of semidiurnal tides by increasing or decreasing their amplitudes depending on the tidal component.
影响因子：
2.6
作者：
Erdal Yiğit;A. Medvedev
通讯作者：
Erdal Yiğit;A. Medvedev