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Discussion papers
https://doi.org/10.5194/acp-2018-640
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-640
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 Sep 2018

Research article | 07 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

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

Michal T. Filus1, Elliot L. Atlas2, Maria A. Navarro2,†, Elena Meneguz3, David Thomson3, Matthew J. Ashfold4, Lucy J. Carpenter5, Stephen J. Andrews5, and Neil R. P. Harris6 Michal T. Filus et al.
  • 1Centre for Atmospheric Science, University of Cambridge, Cambridge, CB2 1EW, UK
  • 2Department of Atmospheric Sciences, RSMAS, University of Miami, Miami, Florida, USA
  • 3Met Office, Atmospheric Dispersion Group, FitzRoy Road, Exeter, EX1 3PB, UK
  • 4School of Environmental and Geographical Sciences, University of Nottingham Malaysia Campus, 43500,Semenyih, Selangor, Malaysia
  • 5Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
  • 6Centre for Environmental and Agricultural Informatics, Cranfield University, Cranfield, MK43 0AL, UK
  • Deceased: 19.12.2017

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

Michal T. Filus et al.
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Michal T. Filus et al.
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The effectiveness of transport of short-lived halocarbons to the upper troposphere and lower stratosphere remains an important unknown in quantifying the supply of ozone-depleting substances to the stratosphere. In early 2014, a major field campaign in Guam in the West Pacific, involving UK and US research aircraft, sampled the tropical troposphere and lower stratosphere. The resulting measurements of CH3I, CHBr3 and CH2Br2 are compared here with calculations from a Lagrangian model.
The effectiveness of transport of short-lived halocarbons to the upper troposphere and lower...
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