Observations of upper tropospheric acetylene on Saturn: No apparent correlation with 2000Â km-sized thunderstorms

► Lightning chemistry predicts enhancement in tropospheric C2H2 on Saturn/Jupiter. ► Cassini/CIRS data studied to search for enhancements in tropospheric C2H2 on Saturn. ► No tropospheric C2H2 enhancements found correlating with lightning activity. ► Asserted that lightning cannot be dominant source for tropospheric C2H2 on Saturn.