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International audienceA possible transport mechanism from the tropical troposphere to the lower stratosphere (LS) across the tropical tropopause layer (TTL)  is  through  convective  overshooting  clouds  (COV)  that  inject air with tropospheric characteristics (high carbon monoxide (CO)  and  low  ozone  (O3)  concentrations)  into  the  LS  over  a  few  days. Evidence of such convective intrusions was observed at the end of January 2010, associated with increased convective activity over  the  southern  African  continent  following  the  onset  of  a  sudden stratospheric warming (SSW) in the northern hemisphere, lasting  approximately  two  weeks.  The  modulation  of  tropical  stratospheric  upwelling  by  SSW  appears  to  have  forced  stronger  and deeper tropical convection, particularly in the Southern Hemisphere  tropics.  The  tropospheric  (CO-rich,  O3-poor)  air  injected  into  the  TTL  by  COV  then  gradually  moved  upward  via  the  tropical stratospheric upwelling strengthened by SSW. Meanwhile the  O3  decrease  started  in  the  middle  stratosphere  and  descended  gradually  to  the  TTL,  indicating  that  the  effect  of  stratospheric  upwelling  reached  the  TTL.  The  present  results  suggest  that  the  direct  and  indirect  (strengthened  convective  clouds)  effects  of  stratospheric  upwelling  modulated  by  SSW  can  have  a  large  impact on the trace gas fields in the TTL and LS

Rapid Convective Transport of Tropospheric Air into the Tropical Lower Stratosphere during the 2010 Sudden Stratospheric Warming