DOI: 10.1029/2012JD017845
论文题名: Coordinated investigation of summer time mid-latitude descending e layer (E<inf>s</inf>) perturbations using Na lidar, ionosonde, and meteor wind radar observations over Logan, Utah (41.7°N, 111.8°W)
作者: Yuan T. ; Fish C. ; Sojka J. ; Rice D. ; Taylor M.J. ; Mitchell N.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 4 起始页码: 1734
结束页码: 1746
语种: 英语
英文关键词: Es
; Na lidar
; planetary wave
; tide
; zonal wind
Scopus关键词: Atmospheric electricity
; Damping
; E region
; Einsteinium
; Modulation
; Radiosondes
; Sodium
; Tides
; General circulation model
; Nonlinear interactions
; Planetary Waves
; Quasi-two-day waves
; Saskatchewan , Canada
; Thermosphere-ionosphere
; Utah state universities
; Zonal wind
; Optical radar
; amplitude
; E region
; latitude
; lidar
; meteor
; nonlinearity
; observational method
; oscillation
; radar
; temperature effect
; thermosphere
; Logan
; United States
; Utah
英文摘要: It is well known that there is a strong correlation between the formation of a descending sporadic E layer (Es ) and the occurrence of large upper atmospheric zonal wind shears, most likely driven by solar thermal tides and/or gravity waves. We present new results of Es perturbation events captured between 13 and 17 July 2011 (UT days 194-198) as part of a coordinated campaign using a wind/temperature Na lidar at Utah State University [41.7°N, 111.8°W], and a Canadian Advanced Digital Ionosonde (CADI; Scientific Instrumentation Ltd., Saskatoon, Saskatchewan, Canada) and SkiYMet meteor wind radar, both located at nearby Bear Lake Observatory [41.9°N, 111.4°W]. During this period, the CADI detected strong descending E s on 2 days (195 and 197) when large modulations of the top-side mesospheric Na layer occurred in synchronism with strong oscillations in the ionosonde E region echoes. A weakening in the descending E layer echoes was observed on the other 2 days (196 and 198) coincident with a large reduction in the zonal diurnal and semidiurnal amplitudes above 95 km. Both tidal components were found to have comparable contributions to the total zonal wind shear that was critical for Es formation and its downward propagation. Further investigation indicates that the weakening tidal amplitudes and the occurrence of the Es events were also influenced by a strong quasi-two-day period modulation, suggesting significant quasi-two-day wave (QTDW) interactions with the tides. Indeed, a nonlinear, wave-wave interaction-induced 16-hour period child wave was also detected, with amplitude comparable to that of the prevailing tides. These interaction processes and their associated effects are consistent with earlier Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model studies of nonlinear interactions between the migrating tidal waves and the QTDW and were probably responsible for the observed damping of the tidal amplitudes resulting in the disruption of the Es . Key PointsEs induces large perturbations of Na abundance in lower thermosphereEs weakening is coincident with weakening of zonal wind tidesThe damping of tidal amplitude is the result of interaction between PW and Tide © 2012. American Geophysical Union. All Rights Reserved. 资助项目: 1135882
; NE/H009760/1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63918
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: Center of Atmosphere and Space Sciences, Utah State University, Logan, UT, United States; Space Dynamic Laboratory, Utah State University Research Foundation, North Logan, UT, United States; Space Environment Corporation, Providence, UT, United States; Department, Electronic and Electrical Engineering, University of Bath, Bath, United Kingdom
Recommended Citation:
Yuan T.,Fish C.,Sojka J.,et al. Coordinated investigation of summer time mid-latitude descending e layer (E<inf>s</inf>) perturbations using Na lidar, ionosonde, and meteor wind radar observations over Logan, Utah (41.7°N, 111.8°W)[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(4)