Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Evening Poster

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

[P-EM18] Physics and Chemistry in the Atmosphere and Ionosphere

Tue. May 22, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(国立研究開発法人 情報通信研究機構)

[PEM18-P02] Imaging observations of atmospheric gravity waves using a near-infrared camera in Patagonia

*Shin Suzuki1, Takuji Nakamura2, Mitsumu K. Ejiri2, Katsuhiko Tsuno3, Takanori Nishiyama2, Akira Mizuno4, Jacobo Salvador5,6,7 (1.Faculty of Regional Policy, Aichi University, 2.National Institute of Polar Research, 3.RIKEN, 4.Institute for Space–Earth Environmental Research, Nagoya University, 5.Laser Application Research Center (CEILAP)–UNIDEF (MINDEF-CONICET), 6.Universidad Tecnológica Nacional, Facultad Regional Buenos Aires, 7.Universidad Nacional de la Patagonia Austral)

Atmospheric gravity waves significantly contribute to the wind/thermal structures in the mesosphere and lower thermosphere (MLT) through their vertical transport of horizontal momentum. It has been reported that the gravity wave momentum flux preferentially associated with the scale of the waves. Airglow imaging is a useful technique to observe two-dimensional structure of small-scale (<100 km) gravity waves in the MLT region and has been used to investigate global behaviour of the waves. In the Southern hemisphere, however, the observations of the MLT gravity waves are very limited compared to those in the Northern hemisphere.
The ANtarctic Gravity Wave Instrument Network (ANGIWN) project has started in 2011 to understand gravity waves over the Antarctic and the effects on general circulation. It is known that the southern Andes is a hot spot of gravity waves and would also contribute significantly to the dynamics in the upper atmosphere. We installed all-sky camera to monitor the MLT gravity waves in November 2017 at Rio Gallegos station (51.6S, 69.3W), Patagonia, Argentina, as an extension the ANGWIN network. The Patagonia camera has an InGaAs array sensor, which is sensitive to the near-infrared (900-1700 nm), and can image OH Meinel band airglow (height: ~85 km) without interference filter, obtaining an OH airglow image every 5 s with an exposure time of 2 s. The system is similar to the imagers of ANGWIN network at Davis, McMurdo, Halley, Syowa and the south-pole. We expect that the airglow imaging at this site would contribute to reveal the characteristic of gravity waves generated around the hot spot at Andes and Antarctic Peninsula.
In this presentation, we will report the design of the observation system and some initial results.