JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

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

[A-AS10] [EE] Interhemispheric and intrahemispheric coupling of the atmosphere

Tue. May 23, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Masaki Tsutsumi(National Institute of Polar Research), Yoshihiro Tomikawa(National Institute of Polar Research), Xinzhao Chu(University of Colorado Boulder)

[AAS10-P11] Vertical and meridional extent of effects of energetic particle precipitation

*Yoshihiro Tomikawa1 (1.National Institute of Polar Research)

This study extracts effects of energetic particle precipitation (EPP) on the middle atmosphere in the southern hemisphere from the latest reanalysis datasets using multiple regression analysis and composite analysis. Statistically significant temperature anomalies in the winter polar upper stratosphere and lower mesosphere are found, but a simple dynamical signature explaining the anomalies is not evident. On the other hand, it is found that a negative temperature anomaly extending from the polar lower mesosphere to the midlatitude upper stratosphere in July is driven by anomalous Eliassen-Pam flux divergence in the midlatitude lower mesosphere. Vertical and meridional extent of the EPP effects will be discussed in my presentation.