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DOI10.1029/2017JD027970
The Excitation of Secondary Gravity Waves From Local Body Forces: Theory and Observation
Vadas, Sharon L.1; Zhao, Jian2,3; Chu, Xinzhao2,3; Becker, Erich4
2018-09-16
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2018
卷号123期号:17页码:9296-9325
文章类型Article
语种英语
国家USA; Germany
英文摘要

We examine the characteristics of secondary gravity waves (GWs) excited by a localized (in space) and intermittent (in time) body force in the atmosphere. This force is a horizontal acceleration of the background flow created when primary GWs dissipate and deposit their momentum on spatial and temporal scales of the wave packet. A broad spectrum of secondary GWs is excited with horizontal scales much larger than that of the primary GW. The polarization relations cause the temperature spectrum of the secondary GWs generally to peak at larger intrinsic periods (Ir) and horizontal wavelengths (H) than the vertical velocity spectrum. We find that the one-dimensional spectra (with regard to frequency or wave number) follow lognormal distributions. We show that secondary GWs can be identified by a horizontally displaced observer as fishbone or > structures in z - t plots whereby the positive and negative GW phase lines meet at the knee, z(knee), which is the altitude of the force center. We present two wintertime cases of lidar temperature measurements at McMurdo, Antarctica (166.69 degrees E, 77.84 degrees S) whereby fishbone structures are seen with z(knee)=43 and 52km. We determine the GW parameters and density-weighted amplitudes for each. We show that these parameters are similar below and above z(knee). We verify that the GWs with upward (downward) phase progression are downward (upward) propagating via use of model background winds. We conclude that these GWs are likely secondary GWs having ground-based periods (r)=6-10hr and vertical wavelengths (z)=6-14km, and that they likely propagate primarily southward.


英文关键词secondary gravity waves body forces lidar measurements Antarctica
领域气候变化
收录类别SCI-E
WOS记录号WOS:000445617500022
WOS关键词MIDDLE ATMOSPHERE ; LIDAR OBSERVATIONS ; MCMURDO 77.8-DEGREES-S ; RAYLEIGH LIDAR ; ANTARCTICA ; MESOSPHERE ; GENERATION ; 166.7-DEGREES-E ; RESPONSES ; BREAKING
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/32966
专题气候变化
作者单位1.Northwest Res Associates, Boulder, CO 80301 USA;
2.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA;
3.Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USA;
4.Leibniz Inst Atmospher Phys, Kuhlungsborn, Germany
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GB/T 7714
Vadas, Sharon L.,Zhao, Jian,Chu, Xinzhao,et al. The Excitation of Secondary Gravity Waves From Local Body Forces: Theory and Observation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(17):9296-9325.
APA Vadas, Sharon L.,Zhao, Jian,Chu, Xinzhao,&Becker, Erich.(2018).The Excitation of Secondary Gravity Waves From Local Body Forces: Theory and Observation.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(17),9296-9325.
MLA Vadas, Sharon L.,et al."The Excitation of Secondary Gravity Waves From Local Body Forces: Theory and Observation".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.17(2018):9296-9325.
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