Articles | Volume 18, issue 8
https://doi.org/10.5194/acp-18-5691-2018
https://doi.org/10.5194/acp-18-5691-2018
Research article
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24 Apr 2018
Research article | Highlight paper |  | 24 Apr 2018

Using satellite measurements of N2O to remove dynamical variability from HCl measurements

Richard S. Stolarski, Anne R. Douglass, and Susan E. Strahan

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Subject: Gases | Research Activity: Remote Sensing | Altitude Range: Stratosphere | Science Focus: Chemistry (chemical composition and reactions)
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Cited articles

Brown, A. T., Chipperfield, M. P., Boone, C., Wilson, C., Walker, K. A., and Bernath, P. F.: Trends in atmospheric halogen containing gases since 2004, J. Quant. Spectrosc. Radiat. Transf., 112 , 2552–2566, https://doi.org/10.1016/j.jqsrt.2011.07.005, 2011. 
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Froidevaux, L., Livesey, N., and Read, W.: MLS/Aura Level 2 Hydrogen Chloride (HCl) Mixing Ratio V004, Greenbelt, MD, USA, Goddard Earth Sciences Data and Information Services Center (GES DISC), https://doi.org/10.5067/Aura/MLS/DATA2010, 2015. 
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Short summary
Detecting trends in short data sets of stratospheric molecules is difficult because of variability due to dynamical fluctuations. We suggest that one way around this difficulty is using the measurements of one molecule to remove dynamical variability from the measurements of another molecule. We illustrate this using Aura MLS measurements of N2O to help us sort out issues in the determination of trends in HCl. This shows that HCl is decreasing throughout the middle stratosphere as expected.
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