Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-19-0264.1 |
Gravity Wave Excitation during the Coastal Transition of an Extreme Katabatic Flow in Antarctica | |
Vignon, Etienne1; Picard, Ghislain2; Duran-Alarcon, Claudio2; Alexander, Simon P.3; Gallee, Hubert2; Berne, Alexis1 | |
2020-04-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:4页码:1295-1312 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; France; Australia |
英文摘要 | The offshore extent of Antarctic katabatic winds exerts a strong control on the production of sea ice and the formation of polynyas. In this study, we make use of a combination of ground-based remotely sensed and meteorological measurements at Dumont d'Urville (DDU) station, satellite images, and simulations with the Weather Research and Forecasting Model to analyze a major katabatic wind event in Adelie Land. Once well developed over the slope of the ice sheet, the katabatic flow experiences an abrupt transition near the coastal edge consisting of a sharp increase in the boundary layer depth, a sudden decrease in wind speed, and a decrease in Froude number from 3.5 to 0.3. This so-called katabatic jump manifests as a turbulent "wall" of blowing snow in which updrafts exceed 5 m s(-1). The wall reaches heights of 1000 m and its horizontal extent along the coast is more than 400 km. By destabilizing the boundary layer downstream, the jump favors the trapping of a gravity wave train-with a horizontal wavelength of 10.5 km-that develops in a few hours. The trapped gravity waves exert a drag that considerably slows down the low-level outflow. Moreover, atmospheric rotors form below the first wave crests. The wind speed record measured at DDU in 2017 (58.5 m s(-1)) is due to the vertical advection of momentum by a rotor. A statistical analysis of observations at DDU reveals that katabatic jumps and low-level trapped gravity waves occur frequently over coastal Adelie Land. It emphasizes the important role of such phenomena in the coastal Antarctic dynamics. |
英文关键词 | Antarctica Gravity waves Katabatic winds |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000528754800004 |
WOS关键词 | ADELIE-LAND ; EAST ANTARCTICA ; DUMONT DURVILLE ; BOUNDARY-LAYER ; MOMENTUM FLUX ; COATS LAND ; PART II ; WIND ; SURFACE ; LEE |
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/280317 |
专题 | 地球科学 |
作者单位 | 1.Ecole Polytech Fed Lausanne, Environm Remote Sensing Lab LTE, Lausanne, Switzerland; 2.CNRS, Inst Geosci Environm, UGA, UMR 5001, Grenoble, France; 3.Australian Antarctic Div, Hobart, Tas, Australia |
推荐引用方式 GB/T 7714 | Vignon, Etienne,Picard, Ghislain,Duran-Alarcon, Claudio,et al. Gravity Wave Excitation during the Coastal Transition of an Extreme Katabatic Flow in Antarctica[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(4):1295-1312. |
APA | Vignon, Etienne,Picard, Ghislain,Duran-Alarcon, Claudio,Alexander, Simon P.,Gallee, Hubert,&Berne, Alexis.(2020).Gravity Wave Excitation during the Coastal Transition of an Extreme Katabatic Flow in Antarctica.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(4),1295-1312. |
MLA | Vignon, Etienne,et al."Gravity Wave Excitation during the Coastal Transition of an Extreme Katabatic Flow in Antarctica".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.4(2020):1295-1312. |
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