TY - JOUR
T1 - Effects of Horizontal Wind Structure on a Gravity Wave Event in the Middle Atmosphere Over Syowa (69°S, 40°E), the Antarctic
AU - Kogure, Masaru
AU - Nakamura, Takuji
AU - Ejiri, Mitsumu K.
AU - Nishiyama, Takanori
AU - Tomikawa, Yoshihiro
AU - Tsutsumi, Masaki
N1 - Funding Information:
The authors would like to thank Damian Murphy (Australian Antarctic Division) for useful discussions that improve this study. This work was supported by JSPS KAKENHI grants JP24340121 and JP15H02137 and by NIPR projects KP-2 and KP-301. This study was also supported by JSPS Overseas Challenge Program for Young Researchers (No. 201780038). The Syowa Rayleigh/ Raman lidar was operated by the Japanese Antarctic Research Expedition (JARE) under the prioritized project AJ1. The lidar data can be accessed at http://id.nii.ac.jp/1291/00014824/.
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/5/28
Y1 - 2018/5/28
N2 - Nightly mean potential energy of gravity waves (GWs) per unit mass (Ep) over Syowa Station (69°S, 40°E) was calculated from temperature profiles observed by the Rayleigh/Raman lidar from 2011 to 2015. The Ep values in the upper stratosphere and lower mesosphere were significantly enhanced on 8–21 August 2014, except on 12 August. A ray-tracing analysis showed that large-scale GWs emitted from various latitudes could be refracted and forced to converge above Syowa due to the poleward tilting of the polar night jet with altitude. It should be noted that Ep on 12 August was smaller than the other values during the enhancement, despite similar polar night jet conditions. A synoptic-scale disturbance, which passed on 12 August, could have blocked the GWs from propagating upward through critical level filtering. These results suggest that convergence of the wave should be considered as a part of the intermittency of the GWs.
AB - Nightly mean potential energy of gravity waves (GWs) per unit mass (Ep) over Syowa Station (69°S, 40°E) was calculated from temperature profiles observed by the Rayleigh/Raman lidar from 2011 to 2015. The Ep values in the upper stratosphere and lower mesosphere were significantly enhanced on 8–21 August 2014, except on 12 August. A ray-tracing analysis showed that large-scale GWs emitted from various latitudes could be refracted and forced to converge above Syowa due to the poleward tilting of the polar night jet with altitude. It should be noted that Ep on 12 August was smaller than the other values during the enhancement, despite similar polar night jet conditions. A synoptic-scale disturbance, which passed on 12 August, could have blocked the GWs from propagating upward through critical level filtering. These results suggest that convergence of the wave should be considered as a part of the intermittency of the GWs.
UR - http://www.scopus.com/inward/record.url?scp=85047610456&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047610456&partnerID=8YFLogxK
U2 - 10.1029/2018GL078264
DO - 10.1029/2018GL078264
M3 - Article
AN - SCOPUS:85047610456
VL - 45
SP - 5151
EP - 5157
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 10
ER -