DOI: 10.1029/2017JD027998
Scopus记录号: 2-s2.0-85047599608
论文题名: A Statistical Study of Inertia Gravity Waves in the Lower Stratosphere Over the Arctic Region Based on Radiosonde Observations
作者: Huang K.M. ; Yang Z.X. ; Wang R. ; Zhang S.D. ; Huang C.M. ; Yi F. ; Hu F.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 10 起始页码: 4958
结束页码: 4976
语种: 英语
英文关键词: IGWs
; the Arctic
英文摘要: Relative to many investigations of inertial gravity waves (IGWs) in the Antarctic, IGW activity in the Arctic region was paid less attention to. We use radiosonde observations at the Ny-Alesund station (78.9°N, 11.9°E) from April 2012 to June 2016 to study the IGW characteristics in the lower stratosphere over the Arctic. The observation reveals a prevailing eastward zonal background wind below 20 km and an obvious annual cycle of the background temperature from the troposphere to the lower stratosphere, which is different from the results in the middle and low latitudes. By combining Lomb-Scargle spectrum and hodograph technique, case study demonstrates that the lower stratospheric IGWs exhibit a feature of freely propagating waves. Statistical analysis indicates that the IGWs have dominant horizontal (vertical) wavelength of 50–1,050 km (1–4 km) and ratio (1–2.5) of the intrinsic to inertia frequencies. Wave energy exhibits an annual oscillation with the maximum in winter and the minimum in summer. In winter, the downward propagating waves increase to about 20% due to polar stratospheric vortex. Because of the lower atmospheric filtering, the IGWs display a dominant direction of westward propagation, thus have a mean vertical flux of −0.647 mPa for the zonal momentum, which indicates that the IGWs can put a westward drag on the atmospheric wind field over the Arctic as they break and dissipate. All the vertical wavenumber spectra have spectral slopes from −2.23 to −2.99 close to the universal spectrum index of −3. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113875
Appears in Collections: 气候减缓与适应
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作者单位: School of Electronic Information, Wuhan University, Wuhan, China; Key Laboratory of Geospace Environment, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, China; Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China; State Observatory for Atmospheric Remote Sensing, Wuhan, China; SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China
Recommended Citation:
Huang K.M.,Yang Z.X.,Wang R.,et al. A Statistical Study of Inertia Gravity Waves in the Lower Stratosphere Over the Arctic Region Based on Radiosonde Observations[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(10)