Wed. May 24, 2017 9:00 AM - 10:30 AM A03 (Tokyo Bay Makuhari Hall)

convener:Nawo Eguchi(Kyushu University), Rei Ueyama(NASA Ames Research Center), Sean M Davis(NOAA Boulder), Seok Woo Son(Seoul National University), Chairperson:Masatomo Fujiwara(Faculty of Environmental Earth Science, Hokkaido University), Chairperson:Sean Davis(NOAA Boulder), Chairperson:Nawo Eguchi(Kyushu University)

The (thermo-)dynamics, radiative and chemical processes in the upper troposphere and lower stratosphere (UTLS) are critical for understanding the present and future climate. While the dynamical and chemical impacts of the troposphere on the stratosphere have been recognized for some time, recent studies have also indicated significant stratospheric influence on the troposphere. This session will highlight recent progress in our understanding of stratosphere-troposphere exchange processes, dynamical coupling, and various phenomena in the troposphere and stratosphere, with a focus on the UTLS region. We welcome contributions addressing radiative, dynamical, and chemical processes in UTLS region, based on both observations and models. Further, this session builds upon the middle atmosphere session traditionally held at the JpGU annual meetings and aims to provide a platform for sharing recent findings and international collaborations on this topic.