Japan Geoscience Union Meeting 2023

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS09] Stratosphere-troposphere Processes And their Role in Climate

Fri. May 26, 2023 9:00 AM - 10:15 AM 201A (International Conference Hall, Makuhari Messe)

convener:Masakazu Taguchi(Aichi University of Education), Nawo Eguchi(Research Institute for Applied Mechanics, Kyushu University), Masashi Kohma(Department of Earth and Planet Science, Graduate School of Science, The University of Tokyo), Shunsuke Noguchi(Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University), Chairperson:Masakazu Taguchi(Aichi University of Education)


9:00 AM - 9:15 AM

[AAS09-01] Summer monsoons in the UTLS as observed by recent NASA airborne campaigns

★Invited Papers

*Rei Ueyama1 (1.NASA Ames Research Center)

Keywords:summer monsoon, upper troposphere, lower stratosphere, middle atmosphere, aircraft campaign, atmospheric composition

During boreal summer, the circulation of the northern hemisphere upper troposphere and lower stratosphere (UTLS) is dominated by two quasi-stationary anticyclonic eddies driven by latent heat released in the troposphere: the Asian Monsoon Anticyclone (AMA) and the North American Monsoon Anticyclone (NAMA). Deep convection rapidly transports boundary layer air to the UTLS, and the monsoon anticyclones act to partially confine and isolate air from the surrounding atmosphere. The interactions between chemistry and circulation within these systems are crucial for understanding the sensitivity of these regions to changes in climate and air quality.

Satellite observations show that within the summer monsoon anticyclones is a region of enhanced water vapor, aerosol, and trace gases of boundary layer origin near the tropopause level. However, satellite data do not provide necessary details for process studies and for diagnosing their representations in models. In response to this need, NASA conducted two airborne missions to investigate these summer monsoon systems and their roles in climate. NASA Earth Venture Suborbital 3 (EVS-3) mission called Dynamics and Chemistry of the Summer Stratosphere (DCOTSS) completed two deployments in Salina, Kansas during summers 2021 and 2022 to study the NAMA. The Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) was a multi-agency effort to investigate the AMA from Osan, South Korea in summer 2022. In this talk, I will provide an overview of these two airborne missions and discuss some of their achievements.