Characteristics of Gravity Wave Horizontal Phase Velocity Spectra in the Mesosphere Over the Antarctic Stations, Syowa and Davis
Characteristics of Gravity Wave Horizontal Phase Velocity Spectra in the Mesosphere Over the Antarctic Stations, Syowa and Davis
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昭和站和戴维斯站上空中间层重力波水平相速度谱特征
DOI：
10.1029/2022jd037751
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Nishiyama, Takanori
中科院分区：
文献类型：
--
作者：
Kogure, Masaru;Nakamura, Takuji;Murphy, Damian J.;Taylor, Michael J.;Zhao, Yucheng;Pautet, Pierre‐Dominique;Tsutsumi, Masaki;Tomikawa, Yoshihiro;Ejiri, Mitsumu K.;Nishiyama, Takanori
利用2016年3月至10月的OH气辉数据，获得了两个南极站（Davis和Syowa）的中间层重力波相速度谱和总功率。两站的总功率具有相似的季节变化，均在冬季达到最大值。两站冬季平均功率差异不显著。然而，9月在戴维斯的功率比在Syowa的功率小三倍。戴维斯的低功率归因于全向相速度的gw。戴维斯的低GW活动可归因于波过滤的纵向变化；戴维斯的大风比锡奥瓦的大风过滤了更多的gw。此外，为了探索中层大气中可能的源，我们研究了8月29日在Davis出现的一个事件，其中相位速度为~ 100 ms−1的GWs出现在东南方向。采用射线追踪方法，其结果表明，这些具有高东南相速度的gw在南大洋上空从~ 45 km或更高的高度传播。在其射线路径的50 km处发现了一个很大的非线性平衡方程残差。极有可能来自对流层喷流的gww也在南大洋上空终止高度的射线路径附近被发现，可能在45至50公里之间出现饱和。因此，Davis的OH成像仪可能捕获了由平流层上层自发调整产生的gw和/或由对流层喷流产生的gw断裂产生的二次gw。
Mesospheric gravity‐wave (GW) phase velocity spectra and total powers at two Antarctic stations, Davis and Syowa, were derived using OH airglow data from March to October in 2016. The total powers have similar seasonal variation, that is, maxima in winter at both stations. The average powers at both stations in winter were not significantly different. However, the power at Davis in September was three times smaller than that at Syowa. This lower power at Davis was attributed to GWs with omnidirectional phase velocity. These lower GW activities at Davis could be attributed to a longitudinal variation in wave filtering; a stronger wind at Davis filtered out more GWs than at Syowa. Also, to explore possible sources in the middle atmosphere, we investigated one event, in which GWs with ∼100 ms−1southeastward phase velocity appeared at Davis on 29 August. The raytracing method was applied, and its result indicated that those GWs with high southeastward phase velocity propagated from ∼45 km altitude or higher over the Southern Ocean. A large residual of the non‐linear balanced equation was found at 50 km on its ray path. GWs, very likely emitted from a tropospheric jet, were also found near the ray path at the termination altitude over the Southern Ocean and possibly appeared saturated between 45 and 50 km. Therefore, the OH imager at Davis probably captured GWs generated by a spontaneous adjustment in the upper stratosphere and/or secondary GWs produced by the breaking of the GWs that have originated from the tropospheric jet.
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DOI：
10.1029/2021jd035842
发表时间：
2021-12
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
H. Kam;In‐Sun Song;Jeong‐han Kim;Y. Kim;Byeong‐Gwon Song;Takuji Nakamura;Y. Tomikawa;Masaru Kogure;M. Ejiri;S. Perwitasari;M. Tsutsumi;Y. Kwak
通讯作者：
H. Kam;In‐Sun Song;Jeong‐han Kim;Y. Kim;Byeong‐Gwon Song;Takuji Nakamura;Y. Tomikawa;Masaru Kogure;M. Ejiri;S. Perwitasari;M. Tsutsumi;Y. Kwak
DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
P. M. Franke;W. Robinson
通讯作者：
W. Robinson
介尺度和次介尺度重力波之间的相互作用及其在介尺度解析模型中的有效表示
影响因子：
3.1
作者：
J. Wilhelm;T. Akylas;G. Bölöni;Junhong Wei;B. Ribstein;R. Klein;U. Achatz
通讯作者：
U. Achatz
影响因子：
6.3
作者：
Hoffmann, Lars;Spang, Reinhold;Stein, Olaf
通讯作者：
Stein, Olaf
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
Y. Tomikawa
通讯作者：
Y. Tomikawa