DOI: 10.1002/2016JD026217
论文题名: Characteristics of mesospheric gravity waves over Antarctica observed by Antarctic Gravity Wave Instrument Network imagers using 3-D spectral analyses
作者: Matsuda T.S. ; Nakamura T. ; Ejiri M.K. ; Tsutsumi M. ; Tomikawa Y. ; Taylor M.J. ; Zhao Y. ; Pautet P.-D. ; Murphy D.J. ; Moffat-Griffin T.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
语种: 英语
英文关键词: Airglow imaging
; ANGWIN
; Antarctica
; Critical level filtering
; Mesospheric gravity wave
; Spectral analysis
英文摘要: We have obtained horizontal phase velocity distributions of the gravity waves around 90 km from four Antarctic airglow imagers, which belong to an international airglow imager/instrument network known as ANGWIN (Antarctic Gravity Wave Instrument Network). Results from the airglow imagers at Syowa (69°S, 40°E), Halley (76°S, 27°W), Davis (69°S, 78°E), and McMurdo (78°S, 167°E) were compared, using a new statistical analysis method based on 3-D Fourier transform (Matsuda et al., 2014) for the observation period between 7 April and 21 May 2013. Significant day-to-day and site-to-site differences were found. The averaged phase velocity spectrum during the observation period showed preferential westward direction at Syowa, McMurdo, and Halley, but no preferential direction at Davis. Gravity wave energy estimated by I'/I was ~5 times larger at Davis and Syowa than at McMurdo and Halley. We also compared the phase velocity spectrum at Syowa and Davis with the background wind field and found that the directionality only over Syowa could be explained by critical level filtering of the waves. This suggests that the eastward propagating gravity waves over Davis could have been generated above the polar night jet. Comparison of nighttime variations of the phase velocity spectra with background wind measurements suggested that the effect of critical level filtering could not explain the temporal variation of gravity wave directionality well, and other reasons such as variation of wave sources should be taken into account. Directionality was determined to be dependent on the gravity wave periods. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62769
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Graduate University for Advanced Studies Tachikawa Japan; National Institute of Polar Research Tachikawa Japan; Physics Department at Utah State University Logan, Utah USA; Australian Antarctic Division Kingston, Tasmania Australia; British Antarctic Survey Cambridge UK
Recommended Citation:
Matsuda T.S.,Nakamura T.,Ejiri M.K.,et al. Characteristics of mesospheric gravity waves over Antarctica observed by Antarctic Gravity Wave Instrument Network imagers using 3-D spectral analyses[J]. Journal of Geophysical Research: Atmospheres,2017-01-01