Interannual Stratospheric Transport Variability Impacts on Surface Trace Gas Concentrations
Abstract
The interannual variability of the stratospheric Brewer-Dobson circulation and stratosphere-troposphere exchange affect surface concentrations of a number of trace gases that are predominantly destroyed or produced in the stratosphere. The stratospheric transport largely controls the amount of loss or production of these trace gases as well as the transport of chemically altered stratospheric air into the troposphere. Interannual variability of stratospheric transport is known to occur due to the QBO, ENSO, SSWs, decadal variability and long-term trends. The interaction between these different modes of interannual variability complicates the interpretation of how each mode impacts stratospheric transport and trace gas concentrations in both the stratosphere and troposphere. In this study we use long-term stratospheric and surface trace gas and meteorological measurements as well as reanalysis and chemistry-climate model (CCM) output to try to disentangle the interactions and impacts of the different modes of variability on stratosphere-to-troposphere exchange and surface trace gas concentrations. We will also show how this analysis can help in the interpretation of surface measurement variability and emission estimates of important trace gases such as CFC-11.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A51S2531P
- Keywords:
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- 3319 General circulation;
- ATMOSPHERIC PROCESSESDE: 3320 Idealized model;
- ATMOSPHERIC PROCESSESDE: 3362 Stratosphere/troposphere interactions;
- ATMOSPHERIC PROCESSESDE: 3363 Stratospheric dynamics;
- ATMOSPHERIC PROCESSES