[A-AS06] Atmospheric (Stratosphere-troposphere) Processes And their Role in Climate

[AAS06-10] On gravity wave activities and temperature-depleted layer obtained from high-altitude radiosonde observation in July 2024

*Takenari Kinoshita¹, Shin-Ya Ogino¹, Junko Suzuki¹, Ryuichi SHIROOKA¹, Qoosaku MOTEKI¹, Ning ZHAO¹, Satoru Yokoi¹ (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:Atmospheric gravity waves, Radiosonde observation, Stratosphere

It has been understood that atmospheric waves and their driving material circulation in the stratosphere directly influence precipitation activity and the jet stream in the troposphere. However, the stratosphere is the region with fewer in-situ observations compared to the troposphere, and there are large differences among reanalysis data, resulting in many uncertainties. To obtain in-situ observation data in the middle and upper stratosphere and to evaluate wave activities and their driving material transport and background field, high-altitude radiosonde observation using large rubber balloons have been conducted in Okinawa. Intensive observations in September 2022 revealed a remarkable temperature-depleted layer at 30-36 km altitude, which is caused by a gravity wave and a westward propagating planetary-scale wave. In this presentation, we will report the results of intensive observations in July 2024, and the relation between the temperature-depleted layer and gravity wave activity, which was also seen in this observation.