DOI: 10.1002/2017JA024839
Scopus记录号: 2-s2.0-85043237167
论文题名: Effect of Southern Hemisphere Sudden Stratospheric Warmings on Antarctica Mesospheric Tides: First Observational Study
作者: Eswaraiah S. ; Kim Y.H. ; Lee J. ; Ratnam M.V. ; Rao S.V.B.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2127
结束页码: 2140
语种: 英语
英文关键词: meteor radar
; MF radar
; MLT tides
; planetary waves
; stratosphere-MLT coupling
; sudden stratospheric warming
英文摘要: We analyzed the structure and variability of observed winds and tides in the Antarctica mesosphere and lower thermosphere (MLT) during the 2002 major sudden stratospheric warming (SSW) and the 2010 minor SSWs. We noted the effect of SSW on the variability of MLT tides for the first time in the Southern Hemisphere, although it has been well recognized in the Northern Hemisphere. We utilized the winds measured by Rothera (68°S, 68°W) medium frequency radar and King Sejong Station (62.22°S, 58.78°W) meteor radar for estimating the tidal components (diurnal, semi-diurnal, and ter-diurnal) in the MLT region. The unusual behavior of diurnal tide (DT) and semidiurnal tide (SDT) was observed in 2002. Zonal SDT amplitudes were enhanced up to 27 m/s after 18 days from the associated SSW day. However, the meridional tidal amplitudes of both DT and SDT suddenly decreased during the peak SSW, and SDT amplitudes slightly increased to 18 m/s afterward. In the normal years, SDT amplitude stays below 15 m/s. During the 2010 SSW, SDT zonal amplitudes increased up to 40 m/s and 50 m/s at altitudes of 80 km and 90 km, respectively, ~30 days after the associated SSW. Similar but weaker effect is noticed in the meridional components. The ter-diurnal tide does not show any significant variation during the SSW. The two SSWs offered a challenging issue to answer: why tidal amplitudes are enhanced with a delay after the SSW. The reasons for the delay are discussed in accordance with theoretical predictions. ©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/114309
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Astronomy, Space Science, and Geology, Chungnam National University, Daejeon, South Korea; National Atmospheric Research Laboratory (NARL), Tirupati, India; Department of Physics, Sri Venkateswara University, Tirupati, India
Recommended Citation:
Eswaraiah S.,Kim Y.H.,Lee J.,et al. Effect of Southern Hemisphere Sudden Stratospheric Warmings on Antarctica Mesospheric Tides: First Observational Study[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)