Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017JD027970 |
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 |
ISSN | 2169-897X |
EISSN | 2169-8996 |
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 |
推荐引用方式 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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