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- W4380479911 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Trends in stratospheric trace gases like HCl, N<sub>2</sub>O, O<sub>3</sub>, and NO<sub>y</sub> show a hemispheric asymmetry over the last two decades, with trends having opposing signs in the Northern and Southern Hemispheres. Here we use N<sub>2</sub>O, a long-lived tracer with a tropospheric source, as a proxy for stratospheric circulation in the multiple linear regression model used to calculate stratospheric trace gas trends. This is done in an effort to isolate trends due to circulation changes from trends due to ozone depleting substances. We use measurements from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) and the Optical Spectrograph and InfraRed Imager System (OSIRIS), and model results from the Whole Atmosphere Community Climate Model (WACCM). Trends in HCl, O<sub>3</sub>, and NO<sub>y</sub> for 2004–2018 are examined. Using the N<sub>2</sub>O regression proxy, we show that observed HCl increases in the Northern Hemisphere are due to changes in the stratospheric circulation. We also show that negative O<sub>3</sub> trends above 30 hPa in the Northern Hemisphere can be explained by change in the circulation, but that negative ozone trends at lower levels cannot. Trends in stratospheric NO<sub>y</sub> are found to be largely consistent with trends in N<sub>2</sub>O." @default.
- W4380479911 created "2023-06-14" @default.
- W4380479911 creator A5076813518 @default.
- W4380479911 date "2023-06-13" @default.
- W4380479911 modified "2023-09-30" @default.
- W4380479911 title "Comment on egusphere-2023-1028" @default.
- W4380479911 doi "https://doi.org/10.5194/egusphere-2023-1028-rc1" @default.
- W4380479911 hasPublicationYear "2023" @default.
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