DOI: 10.1002/2015GL065066
论文题名: A method for estimating the height of a mesospheric density level using meteor radar
作者: Younger J.P. ; Reid I.M. ; Vincent R.A. ; Murphy D.J.
刊名: Geophysical Research Letters
ISSN: 0094-9473
EISSN: 1944-9204
出版年: 2015
卷: 42, 期: 14 起始页码: 6106
结束页码: 6111
语种: 英语
英文关键词: density
; mesosphere
; meteor
; MLS
; radar
Scopus关键词: Atmospheric density
; Density (specific gravity)
; Ionization of gases
; Ionosphere
; Radar
; Atmospheric radars
; Density variations
; High-time resolution
; Mesosphere
; Mesosphere/lower thermospheres
; Meteor
; Microwave limb sounder
; MLS
; Space-based radar
; Aura (satellite)
; estimation method
; instrumentation
; mesosphere
; meteor
; microwave limb sounder
; performance assessment
; radar
; spacecraft
; Antarctica
; Davis Station
; East Antarctica
英文摘要: A new technique for determining the height of a constant density surface at altitudes of 78-85 km is presented. The first results are derived from a decade of observations by a meteor radar located at Davis Station in Antarctica and are compared with observations from the Microwave Limb Sounder instrument aboard the Aura satellite. The density of the neutral atmosphere in the mesosphere/lower thermosphere region around 70-110 km is an essential parameter for interpreting airglow-derived atmospheric temperatures, planning atmospheric entry maneuvers of returning spacecraft, and understanding the response of climate to different stimuli. This region is not well characterized, however, due to inaccessibility combined with a lack of consistent strong atmospheric radar scattering mechanisms. Recent advances in the analysis of detection records from high-performance meteor radars provide new opportunities to obtain atmospheric density estimates at high time resolutions in the MLT region using the durations and heights of faint radar echoes from meteor trails. Previous studies have indicated that the expected increase in underdense meteor radar echo decay times with decreasing altitude is reversed in the lower part of the meteor ablation region due to the neutralization of meteor plasma. The height at which the gradient of meteor echo decay times reverses is found to occur at a fixed atmospheric density. Thus, the gradient reversal height of meteor radar diffusion coefficient profiles can be used to infer the height of a constant density level, enabling the observation of mesospheric density variations using meteor radar. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938992332&doi=10.1002%2f2015GL065066&partnerID=40&md5=b6f0172cea3094fab14d056b325883bc
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9088
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: ATRAD Pty Ltd., Thebarton, SA, Australia
Recommended Citation:
Younger J.P.,Reid I.M.,Vincent R.A.,et al. A method for estimating the height of a mesospheric density level using meteor radar[J]. Geophysical Research Letters,2015-01-01,42(14).