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DOI10.5194/acp-19-5993-2019
Mesospheric semidiurnal tides and near-12 h waves through jointly analyzing observations of five specular meteor radars from three longitudinal sectors at boreal midlatitudes
He M.; Luis Chau J.
发表日期2019
ISSN16807316
起始页码5993
结束页码6006
卷号19期号:9
英文摘要

In the last decades, mesospheric tides have been intensively investigated with observations from both ground-based radars and satellites. Single-site radar observations provide continuous measurements at fixed locations without horizontal information, whereas single-spacecraft missions typically provide global coverage with limited temporal coverage at a given location. In this work, by combining 8 years (2009-2016) of mesospheric winds collected by five specular meteor radars from three different longitudinal sectors at boreal midlatitudes (49±8.5ĝ N), we develop an approach to investigate the most intense global-scale oscillation, namely at the period TCombining double low line12±0.5 h. Six waves are resolved: The semidiurnal westward-Traveling tidal modes with zonal wave numbers 1, 2, and 3 (SW1, SW2, SW3), the lunar semidiurnal tide M2, and the upper and lower sidebands (USB and LSB) of the 16 d wave nonlinear modulation on SW2. The temporal variations of the waves are studied statistically with a special focus on their responses to sudden stratospheric warming events (SSWs) and on their climatological seasonal variations. In response to SSWs, USB, LSB, and M2 enhance, while SW2 decreases. However, SW1 and SW3 do not respond noticeably to SSWs, contrary to the broadly reported enhancements in the literature. The USB, LSB, and SW2 responses could be explained in terms of energy exchange through the nonlinear modulation, while LSB and USB might previously have been misinterpreted as SW1 and SW3, respectively. Besides, we find that LSB and M2 enhancements depend on the SSW classification with respect to the associated split or displacement of the polar vortex. In the case of seasonal variations, our results are qualitatively consistent with previous studies and show a moderate correlation with an empirical tidal model derived from satellite observations.

© Author(s) 2019.
语种英语
scopus关键词atmospheric tide; atmospheric wave; mesosphere; midlatitude environment; polar vortex; radar; seasonal variation; sudden stratospheric warming; zonal wind
来源期刊Atmospheric Chemistry and Physics
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/144434
作者单位Leibniz-Institute of Atmospheric Physics at the Rostock University, Kühlungsborn, Germany
推荐引用方式
GB/T 7714
He M.,Luis Chau J.. Mesospheric semidiurnal tides and near-12 h waves through jointly analyzing observations of five specular meteor radars from three longitudinal sectors at boreal midlatitudes[J],2019,19(9).
APA He M.,&Luis Chau J..(2019).Mesospheric semidiurnal tides and near-12 h waves through jointly analyzing observations of five specular meteor radars from three longitudinal sectors at boreal midlatitudes.Atmospheric Chemistry and Physics,19(9).
MLA He M.,et al."Mesospheric semidiurnal tides and near-12 h waves through jointly analyzing observations of five specular meteor radars from three longitudinal sectors at boreal midlatitudes".Atmospheric Chemistry and Physics 19.9(2019).
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