Seasonal and interannual variation of mesospheric gravity waves based on MF radar observations over 15 years at syowa station in the antarctic

Ryosuke Yasui, Kaoru Sato, Masaki Tsutsumi

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

The seasonal and interannual variations of the gravity waves (GWs) in the Antarctic mesosphere were examined using horizontal wind data at altitudes of 50-100 km above the medium frequency (MF) radar at Syowa Station (69.0°S, 39.6°E). The climatology of the GW variance reached a maximum in winter over a wide altitude range of 64-90 km, and the interannual variability was large below 80 km in spring and autumn. These features are consistent with observations from previous studies. In addition, we detected a weak but significant maximum in the GW variance in summer from 70-78 km as well as large interannual variability. Moreover, we examined three possible mechanisms underlying the GW interannual variability observed in summer. The first mechanism was modulation by stratospheric sudden warmings in the Arctic through inter-hemispheric coupling, and it was not clearly observed at Syowa Station. The second mechanism was modulation of the vertical filtering of GWs in association with the breakdown of the polar vortex in the Southern Hemisphere, and it was identified as a potential mechanism. The third mechanism was tropical convection and propagation to the Antarctic region, and it was identified as another likely mechanism of interannual variability in the GWs. This result was supported by the consistency between years with strong tropical precipitation and years with large GW variances at Syowa Station.

本文言語英語
ページ(範囲)46-50
ページ数5
ジャーナルScientific Online Letters on the Atmosphere
12
1
DOI
出版ステータス出版済み - 2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 大気科学

フィンガープリント

「Seasonal and interannual variation of mesospheric gravity waves based on MF radar observations over 15 years at syowa station in the antarctic」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル