[A-CG37] Satellite Earth Environment Observation

[ACG37-13] Vertical distribution of precipitation intensity in the lowest troposphere over Syowa Station, Antarctica

★Invited Papers

*Naohiko Hirasawa^1,2, Hiroyuki Konishi³, Yasushi Fujiyoshi⁴, Katsushi Iwamoto⁵ (1.National Institute of Polar Research, 2.Graduate University for Advanced Studies (SOKENDAI), 3.Osaka-Kyoiku University, 4.Emeritus Prof., Hokkaido University, 5.Fisheries Research Division, City of Mombetsu, Hokkaido)

Keywords:Antarctca, Precipitation, Radar, Satellite, Syowa Station

The IPCC 2019 report estimated that Antarctic ice sheet (AIS) mass began to decrease in the 1990s, equivalent to more than 6 mm of sea level rise. The mass transferred from the AIS to the ocean may increase with future warming. The mass balance of the AIS is primarily determined by precipitation falling on the AIS and ice flowing out from the margins into the ocean. In order to achieve reliable predictions of the future, it is necessary to understand the mechanisms that determine the amount of these inputs and outputs. This study aims to understand precipitation as an input and the mechanisms that govern its variability. Satellite observations are very powerful for undestanding precipitation over the vast Antarctic region, and studies have already been conducted to present annual precipitation for the entire region. However, it has also been pointed out that precipitation estimated from satellite data requires significant modifications. One of the reasons is that ground precipitation has not been obtained due to the difficulty of observation in the lowermost troposphere. In this presentation, we examine the characteristics of precipitation intensity in the lowest troposphere using ground-based radar observations at Syowa Station, Antarctica, and discuss the possibility of improving satellite observation data.