DOI: 10.1002/2017JD027046
Scopus记录号: 2-s2.0-85040177922
论文题名: Unexpected Occurrence of Mesospheric Frontal Gravity Wave Events Over South Pole (90°S)
作者: Pautet P.-D. ; Taylor M.J. ; Snively J.B. ; Solorio C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 160
结束页码: 173
语种: 英语
英文关键词: ANGWIN
; gravity waves
; MLT
; South Pole
Scopus关键词: air temperature
; atmospheric dynamics
; gravity wave
; instrumentation
; mesosphere
; temperature inversion
; upper atmosphere
; vortex
; Antarctica
; East Antarctica
; South Pole
英文摘要: Since 2010, Utah State University has operated an infrared Advanced Mesospheric Temperature Mapper at the Amundsen–Scott South Pole station to investigate the upper atmosphere dynamics and temperature deep within the vortex. A surprising number of “frontal” gravity wave events (86) were recorded in the mesospheric OH(3,1) band intensity and rotational temperature images (typical altitude of ~87 km) during four austral winters (2012–2015). These events are gravity waves (GWs) characterized by a sharp leading wave front followed by a quasi-monochromatic wave train that grows with time. A particular subset of frontal gravity wave events has been identified in the past (Dewan & Picard, 1998) as “bores.” These are usually associated with wave ducting within stable mesospheric inversion layers, which allow them to propagate over very large distances. They have been observed on numerous occasions from low-latitude and midlatitude sites, but to date, very few have been reported at high latitudes. This study provides new analyses of the characteristics of frontal events at high latitudes and shows that most of them are likely ducted. The occurrence of these frontal GW events over this isolated region strongly supports the existence of horizontally extensive mesospheric thermal inversion layers over Antarctica, leading to regions of enhanced stability necessary for GW trapping and ducting. ©2017. 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/114712
Appears in Collections: 气候减缓与适应
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作者单位: Center for Atmospheric and Space Sciences (CASS), Utah State University, Logan, UT, United States; Department of Physical Sciences and CSAR, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States
Recommended Citation:
Pautet P.-D.,Taylor M.J.,Snively J.B.,et al. Unexpected Occurrence of Mesospheric Frontal Gravity Wave Events Over South Pole (90°S)[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)