Variable influence on the equatorial troposphere associated with SSW using ERA-Interim

Journal of Earth system science

Thomas Spangehl4³  Ulrich Cubasch1²  Semjon Schimanke3¹  Sourabh Bal1 2² 

[1] Swedish Meteorological and Hydrological Institute, Norrkoping, Sweden.$$;Institute for Meteorology, Freie Universit¨at, Berlin, Germany.$$;German Weather Service, Offenbach am Main, Germany.$$

关键词: Sudden stratospheric warming;    convective activity;    stratospheric vortex split events.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Sudden stratospheric warming (SSW) events are identified to investigate their influence on the equatorial tropospheric climate. Composite analysis of warming events from Era-Interim (1979–2013) record a cooling of the tropical lower stratosphere with corresponding changes in the mean meridional stratosphericcirculation. A cooling of the upper troposphere induces enhanced convective activity near the equatorial region of the Southern Hemisphere and suppressed convective activity in the off-equatorial Northern Hemisphere. After selecting vortex splits, the see-saw pattern of convective activity in the tropospheregrows prominent and robust.

【 授权许可】

Unknown