Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027303 |
Observations of the Breakdown of Mountain Waves Over the Andes Lidar Observatory at Cerro Pachon on 8/9 July 2012 | |
Hecht, J. H.1; Fritts, D. C.2; Wang, L.2; Gelinas, L. J.1; Rudy, R. J.1; Walterscheid, R. L.1; Taylor, M. J.3; Pautet, P. D.3; Smith, S.4; Franke, S. J.5 | |
2018-01-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:1页码:276-299 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Although mountain waves (MWs) are thought to be a ubiquitous feature of the wintertime southern Andes stratosphere, it was not known whether these waves propagated up to the mesopause region until Smith et al. (2009) confirmed their presence via airglow observations. The new Andes Lidar Observatory at Cerro Pachon in Chile provided the opportunity for a further study of these waves. Since MWs have near-zero phase speed, and zero wind lines often occur in the winter upper mesosphere (80 to 100 km altitude) region due to the reversal of the zonal mean and tidal wind, MW breakdown may routinely occur at these altitudes. Here we report on very high spatial/temporal resolution observations of the initiation of MW breakdown in the mesopause region. Because the waves are nearly stationary, the breakdown process was observed over several hours; a much longer interval than has previously been observed for any gravity wave breakdown. During the breakdown process observations were made of initial horseshoe-shaped vortices, leading to successive vortex rings, as is also commonly seen in Direct Numerical Simulations (DNS) of idealized and multiscale gravity wave breaking. Kelvin-Helmholtz instability (KHI) structures were also observed to form. Comparing the structure of observed KHI with the results of existing DNS allowed an estimate of the turbulent kinematic viscosity. This viscosity was found to be around 25 m(2)/s, a value larger than the nominal viscosity that is used in models. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423433500016 |
WOS关键词 | INTERNAL GRAVITY-WAVES ; KELVIN-HELMHOLTZ BILLOWS ; INSTABILITY DYNAMICS ; BREAKING SIGNATURES ; VORTICITY DYNAMICS ; 3 DIMENSIONS ; NA LIDAR ; PART I ; SODIUM DENSITIES ; TURBULENCE |
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/32240 |
专题 | 气候变化 |
作者单位 | 1.Aerosp Corp, Space Sci Applicat Lab, El Segundo, CA 90245 USA; 2.GATS Inc, Boulder, CO USA; 3.Utah State Univ, Ctr Atmospher & Space Sci, Logan, UT 84322 USA; 4.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 5.Univ Illinois, Elect & Comp Engn, Urbana, IL 61801 USA |
推荐引用方式 GB/T 7714 | Hecht, J. H.,Fritts, D. C.,Wang, L.,et al. Observations of the Breakdown of Mountain Waves Over the Andes Lidar Observatory at Cerro Pachon on 8/9 July 2012[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(1):276-299. |
APA | Hecht, J. H..,Fritts, D. C..,Wang, L..,Gelinas, L. J..,Rudy, R. J..,...&Franke, S. J..(2018).Observations of the Breakdown of Mountain Waves Over the Andes Lidar Observatory at Cerro Pachon on 8/9 July 2012.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(1),276-299. |
MLA | Hecht, J. H.,et al."Observations of the Breakdown of Mountain Waves Over the Andes Lidar Observatory at Cerro Pachon on 8/9 July 2012".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.1(2018):276-299. |
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