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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Gravity Wave Generation and Propagation in the Middle Atmosphere Revealed by a High-Resolution GCM Sato Kaoru 1 , Watanabe Shingo 2 , Kawatani Yoshio 2 , Tomikawa Yoshihiro 3 , Miyazaki Kazuyuki 2 , Takahashi Masaaki 4 1 Department of Earth and Planetary Science, The University of Tokyo, 2 Research Institute for Global Change/JAMSTEC, 3 National Institute of Polar Research, 4 Atmosphere and Ocean Research Institute (AORI), University of Tokyo Gravity waves are one of primary components of the atmospheric dynamics, in particular, in the middle atmosphere. A lot of observational studies using radars, lidars, radiosondes, and satellites have been made to elucidate various aspects of dynamical characteristics of gravity waves so far. However, because observable quantities and observable frequency and wavenumber ranges are limited depending on the sounding instruments, overall characteristics of gravity wave generation and propagation has not been fully understood. With the aid of recently available super-computer technique, we developed a gravity-wave resolving GCM having T213 spectral horizontal resolution and 256 vertical levels extending from the surface to a height of 85 km with a uniform vertical spacing of 300 m. Analyzing hourly data over three model years obtained by our simulation, we make reinterpretation of the gravity wave characteristics fragmented in a real or spectral space that shown by previous observation studies. According to our analysis, important gravity sources penetrating into the middle atmosphere are steep mountains and strong tropospheric westerly jets i n winter and vigorous monsoon convection in summer. It is also shown that poleward propagation of gravity waves from the source region is important, which is not included in gravity wave parameterizations used in most climate models.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Program of the Antarctic Syowa MST/IS Radar (PANSY) Sato Kaoru 1 , Tsutsumi Masaki 2 , Sato Toru 3 , Nakamura Takuji 2 , Saito Akinori 3 , Tomikawa Yoshihiro 2 2 2 2 , Nishimura Koji , Yamagishi Hisao , Yamanouchi Takashi 1 2 Department of Earth and Planetary Science, The University of Tokyo, National Institute of Polar Research, 3 Kyoto University Syowa Station is one of the distinguished stations, where various atmospheric observations for research purposes by universities and institutes as well as operational observations by Japan Meteorological Agency and National Institute of Information and Communications Technology are performed continuously. National Institute of Polar Research plays a central part in the operations. The observation of the Antarctic atmosphere is important in two senses. First, it is easy to monitor weak signal of the earth climate change because contamination due to human activity is quite low. Second, there are various unique atmospheric phenomena in the Antarctic having strong signals such as katabatic flows, the ozone hole, noctilucent clouds, and auroras. The middle atmosphere is regarded as an important region to connect the troposphere and ionosphere. However, its observation is sparse and retarded in the Antarctic compared with the lower latitude regions; nevertheless the vertical coupling is especially important in the polar region. Since 2000, we have developed an MST/IS radar to be operational in the Antarctic and have made feasibility studies including environmental tests at Syowa Station. Various significant problems have been already solved, such as treatment against low temperature and strong winds, energy saving, weight reduction, and efficient construction method. A current configuration of the planned system is a VHF (47MHz) Doppler pulse radar with an active phased array consisting of 1045 yagis. The value of the PANSY project has been approved internationally and domestically by resolutions and recommendations from international scientific organizations such as IUGG, URSI, SPARC, SCOSTEP, and SCAR. The scientific research objectives and technical developments have been frequently discussed at international and domestic conferences and at a scientific meeting at NIPR organized by the PANSY group every year. Special sessions of PANSY were organized at related scientific societies such as Meteorological Society of Japan and SGEPSS to deepen the discussion with an eye to submission of our proposal to Japanese government. As a result, the PANSY project was authorized as one of main observation plans for the period of JARE52-57 in 2008, and funded by Japanese government in 2009. We will start the radar construction at Syowa Station in the Antarctic this year. After a one year for initial test observations, MST/IS observations will be made over 12 years which covers one solar cycle.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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