SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events
SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events
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MLT 半日潮汐变化的 SuperDARN 观测以及对平流层突然变暖事件的响应
DOI：
10.1029/2018jd030157
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Barnes, R. J.
中科院分区：
文献类型：
--
作者：
Hibbins, R. E.;Espy, P. J.;Orsolini, Y. J.;Limpasuvan, V.;Barnes, R. J.
利用北半球超级双极光雷达网络（SuperDARN）的流星风数据，我们（1）证明迁移（太阳同步）潮汐可以与中层和低热层（MLT）区域的非迁移潮汐成分分开，（2）利用它来确定半日潮汐（SDT）的不同成分对突发潮汐的响应。 平流层变暖（SSW）条件。雷达覆盖北纬 60° 左右的有限纬度范围，并位于经度近 180° 范围内。迁移潮是从 95 公里高度附近流星消融漂移速度记录的经向风中观测到的非迁移分量中提取的，并提出了不同分量的 20 年气候学。有据可查的夏末和冬季半日风最大值主要是由迁移的 SDT 造成的，而在深秋和春季，非迁移成分至少与迁移的 SDT 一样强。然后，通过合成 1995 年至 2013 年间记录的与平层顶升高相关的 13 个 SSW 事件来检查 SSW 期间 SDT 成分的稳健行为。可以看到，迁移的 SDT 在 SSW 爆发后立即振幅减小，然后在 SSW 爆发后 10-17 天左右异常强烈地返回。我们得出结论，在 SSW 演化过程中，底层风向的变化在调节潮汐幅度方面发挥了作用，并且在 MLT 中观察到中纬度迁移 SDT（之前在模型研究中报道过）的增强，至少高达 60°N。
Using meteor wind data from the Super Dual Auroral Radar Network (SuperDARN) in the Northern Hemisphere, we (1) demonstrate that the migrating (Sun‐synchronous) tides can be separated from the nonmigrating components in the mesosphere and lower thermosphere (MLT) region and (2) use this to determine the response of the different components of the semidiurnal tide (SDT) to sudden stratospheric warming (SSW) conditions. The radars span a limited range of latitudes around 60°N and are located over nearly 180° of longitude. The migrating tide is extracted from the nonmigrating components observed in the meridional wind recorded from meteor ablation drift velocities around 95‐km altitude, and a 20‐year climatology of the different components is presented. The well‐documented late summer and wintertime maxima in the semidiurnal winds are shown to be due primarily to the migrating SDT, whereas during late autumn and spring the nonmigrating components are at least as strong as the migrating SDT. The robust behavior of the SDT components during SSWs is then examined by compositing 13 SSW events associated with an elevated stratopause recorded between 1995 and 2013. The migrating SDT is seen to reduce in amplitude immediately after SSW onset and then return anomalously strongly around 10–17 days after the SSW onset. We conclude that changes in the underlying wind direction play a role in modulating the tidal amplitude during the evolution of SSWs and that the enhancement in the midlatitude migrating SDT (previously reported in modeling studies) is observed in the MLT at least up to 60°N.
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DOI：
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发表时间：
2010
期刊：
影响因子：
--
作者：
R. Hibbins;O. Marsh;A. McDonald;M. Jarvis
通讯作者：
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福克兰群岛 SuperDARN 雷达记录的南半球中纬度上层中间层的风和潮汐
影响因子：
1.9
作者：
Hibbins R
通讯作者：
Hibbins R
DOI：
10.1016/s1364-6826(02)00340-1
发表时间：
2003-03
影响因子：
1.9
作者：
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DOI：
10.1002/jgrd.50651
发表时间：
2013-08
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
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Olga V. Tweedy;V. Limpasuvan;Y. Orsolini;Anne K. Smith;R. Garcia;D. Kinnison;C. Randall;Ole-Kristian Kvissel;F. Stordal;V. Harvey;A. Chandran
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影响因子：
1.9
作者：
A. Manson;C. Meek;T. Chshyolkova;Xiaoyong Xu;T. Aso;J. Drummond;C. Hall;W. Hocking;C. Jacobi;M. Tsutsumi;W. Ward
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