Japan Geoscience Union Meeting 2015

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Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM27] Physics and Chemistry in the Atmosphere and Ionosphere

Tue. May 26, 2015 9:00 AM - 10:45 AM A01 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(National Institute of Information and Communications Technology), Chair:Yoshihiro Kakinami(School of Systems Engineering, Kochi University of Technology), Yoshihiro Tomikawa(National Institute of Polar Research)

10:00 AM - 10:15 AM

[PEM27-08] Comparison of horizontal phase velocity distributions of gravity waves observed by ANGWIN, using a 3D spectral technique

*Takashi S. MATSUDA1, Takuji NAKAMURA2, Mitsumu K. EJIRI2, Masaki TSUTSUMI2, Michael J. Taylor3, Yucheng Zhao3, P.-Dominique Pautet3, Damian Murphy4, Tracy Moffat-Griffin5 (1.SOKENDAI (The Graduate University for Advanced Studies), 2.National Institute of Polar Research, 3.Utah State University, 4.Australian Antarctic Division, 5.British Antarctic Survey)

Keywords:atmospheric gravity wave, airglow imaging

Atmospheric gravity waves (AGWs), which are generated in the lower atmosphere, transport significant amount of energy and momentum into the mesosphere and lower thermosphere and cause the mean wind accelerations in the mesosphere. This momentum deposit drives the general circulation and affects the temperature structure. Among many parameters to characterize AGWs, horizontal phase velocity is very important to discuss their vertical propagation. Airglow imaging is a useful technique for investigating the horizontal structures of AGWs around mesopause. An international airglow imager (and other instruments) network in the Antarctic, named ANGWIN (Antarctic Gravity Wave Imaging/Instrument Network) was started in 2011. Its purpose is to understand characteristics of mesospheric gravity waves and their impacts on the Mesosphere and Lower Thermosphere (MLT) environment over Antarctica.
In this study, we compared distributions of horizontal phase velocities of gravity waves at around 90 km altitude over different locations using our new statistical analysis method based on 3-D Fourier transform, developed by Matsuda et al. (2014). The comparison has been carried out for airglow imagers at four stations, that are, Syowa (69S, 40E), Halley (76S, 27W), Davis (69S, 78E) and McMurdo (78S, 156E), out of the ANGWIN imagers, for the observation period between April 6 and May 21 in 2013. Not only horizontal propagation characteristics, gravity wave energies can also be quantitatively compared, indicating a smaller GW activity in higher latitudes. The presentation will be focused on showing the performance of the new statistical technique for studying gravity waves.