Transport of short-lived halocarbons to the stratosphere over the Pacific Ocean

摘要: Abstract. The effectiveness of transport short-lived halocarbons to the upper troposphere and lower stratosphere remains an important uncertainty in quantifying the supply ozone-depleting substances stratosphere. In early 2014, a major field campaign in Guam western Pacific, involving UK and US research aircraft, sampled tropical lower stratosphere. resulting measurements CH3I , CHBr3 and CH2Br2 are compared here with calculations from Lagrangian model. This methodology benefits updated convection scheme that improves simulation effect deep convective motions on particle distribution within troposphere. We find that observed mixing ratios tropical tropopause layer (TTL) consistent those boundary when the new is used account for transport. More specifically, comparisons between modelled estimates observations of short-lived indicate is realistic up TTL but less good at reproducing small number extreme events upper TTL. study consolidates our understanding halocarbons to by using improved model calculations confirm consistency boundary layer, atmospheric processes. Our results support recent contribution short-lived bromocarbons stratospheric bromine budget.