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DOI | 10.1029/2019JD030264 |
Gravity Wave Ducting Observed in the Mesosphere Over Jicamarca, Peru | |
Lehmacher, Gerald A.1; Kudeki, Erhan2; Reyes, Pablo M.2,3; Lee, Kiwook2; Heale, Christopher J.4; Snively, Jonathan B.4 | |
2019-05-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:10页码:5166-5177 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Short-period gravity waves are ubiquitous in the mesosphere, but the vertical structures of their perturbations are difficult to observe. The Jicamarca 50-MHz very high frequency radar allows observations of winds and turbulent scatter with high temporal and vertical resolution. We present a case of a quasi-monochromatic gravity wave with period 520 (40)s that is likely ducted below a southward wind jet between 68 and 74km. Above this layer of evanescence, a northward wind enables it to emerge into a more stable layer, where it is refracted to a short vertical wavelength of 2.2(0.2)km; data show evidence of weak nonlinearity, and possible overturning or partial reflection from higher altitudes, above the observable region, in the form of a standing wave structure in vertical velocity at approximately 75km. Based on the dispersion relation, and with help of a two-dimensional model, we determine that most likely the wave is propagating northward and is being ducted below and tunneling through the regions of evanescence created by the wind flow and typical mesospheric thermal structure. This is the first time that such an event has been identified in the Jicamarca mesospheric echoes, and it is distinct from Kelvin-Helmholtz billows also commonly seen with this sensitive radarinstead apparently revealing tunneling of the gravity wave through ambient winds. |
英文关键词 | mesospheric winds gravity waves wave ducting VHF radar |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000471237200002 |
WOS关键词 | HIGH-RESOLUTION ; RADAR OBSERVATIONS ; LOWER THERMOSPHERE ; VHF RADAR ; AIRGLOW ; EVENT |
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/183335 |
专题 | 气候变化 |
作者单位 | 1.Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA; 2.Univ Illinois, Dept Elect & Comp Engn, Urbana, IL USA; 3.SRI Int, Menlo Pk, CA USA; 4.Embry Riddle Aeronaut Univ, Dept Phys Sci, Daytona Beach, FL USA |
推荐引用方式 GB/T 7714 | Lehmacher, Gerald A.,Kudeki, Erhan,Reyes, Pablo M.,et al. Gravity Wave Ducting Observed in the Mesosphere Over Jicamarca, Peru[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(10):5166-5177. |
APA | Lehmacher, Gerald A.,Kudeki, Erhan,Reyes, Pablo M.,Lee, Kiwook,Heale, Christopher J.,&Snively, Jonathan B..(2019).Gravity Wave Ducting Observed in the Mesosphere Over Jicamarca, Peru.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(10),5166-5177. |
MLA | Lehmacher, Gerald A.,et al."Gravity Wave Ducting Observed in the Mesosphere Over Jicamarca, Peru".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.10(2019):5166-5177. |
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