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| DOI | 10.1029/2020JD033038 |
| Gravity Wave Breaking and Vortex Ring Formation Observed by PMC Turbo | |
| Geach C.; Hanany S.; Fritts D.C.; Kaifler B.; Kaifler N.; Kjellstrand C.B.; Williams B.P.; Eckermann S.D.; Miller A.D.; Jones G.; Reimuller J. | |
| 发表日期 | 2020 |
| ISSN | 2169897X |
| 卷号 | 125期号:23 |
| 英文摘要 | Polar mesospheric cloud (PMC) imaging and lidar profiling performed aboard the 5.9-day PMC Turbo balloon flight from Sweden to northern Canada in July 2018 revealed a wide variety of gravity wave (GW) and instability events occurring nearly continuously at approximately 82 km. We describe one event exhibiting GW breaking and associated vortex rings driven by apparent convective instability. Using PMC Turbo imaging with spatial and temporal resolution of 20 m and 2 s, respectively, we quantify the GW horizontal wavelength, propagation direction, and apparent phase speed. We identify vortex rings with diameters of 2–5 km and horizontal spacing comparable to their size. Lidar data show GW vertical displacements of ±0.3 km. From the data, we find a GW intrinsic frequency and vertical wavelength of 0.009 ± 0.003 rad s−1 and 9 ± 4 km, respectively. We show that these values are consistent with the predictions of numerical simulations of idealized GW breaking. We estimate the momentum deposition rate per unit mass during this event to be 0.04 ± 0.02 m s−2 and show that this value is consistent with the observed GW. Comparison to simulation gives a mean energy dissipation rate for this event of 0.05–0.4 W kg−1, which is consistent with other reported in situ measurements at the Arctic summer mesopause. © 2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | convective instability; gravity wave breaking; mesosphere; polar mesospheric clouds; vortex rings |
| 语种 | 英语 |
| 来源期刊 | Journal of Geophysical Research: Atmospheres
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/185593 |
| 作者单位 | University of Minnesota, Twin Cities, Minneapolis, MN, United States; GATS, Boulder, CO, United States; German Aerospace Center (DLR), Munich, Germany; Columbia University, New York, NY, United States; Space Science Division, U.S. Naval Research Laboratory, Washington, DC, United States; University of Southern California, Los Angeles, CA, United States; Formerly at Columbia University, New York, NY, United States; Rigetti Computing, Berkeley, CA, United States; Integrated Spaceflight Services, Boulder, CO, United States |
| 推荐引用方式 GB/T 7714 | Geach C.,Hanany S.,Fritts D.C.,et al. Gravity Wave Breaking and Vortex Ring Formation Observed by PMC Turbo[J],2020,125(23). |
| APA | Geach C..,Hanany S..,Fritts D.C..,Kaifler B..,Kaifler N..,...&Reimuller J..(2020).Gravity Wave Breaking and Vortex Ring Formation Observed by PMC Turbo.Journal of Geophysical Research: Atmospheres,125(23). |
| MLA | Geach C.,et al."Gravity Wave Breaking and Vortex Ring Formation Observed by PMC Turbo".Journal of Geophysical Research: Atmospheres 125.23(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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