Articles | Volume 22, issue 10
Atmos. Chem. Phys., 22, 6539–6558, 2022
https://doi.org/10.5194/acp-22-6539-2022
Atmos. Chem. Phys., 22, 6539–6558, 2022
https://doi.org/10.5194/acp-22-6539-2022
Research article
20 May 2022
Research article | 20 May 2022

Age spectra and other transport diagnostics in the North American monsoon UTLS from SEAC4RS in situ trace gas measurements

Eric A. Ray et al.

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Andrews, A. E., Boering, K. A., Daube, B. C., Wofsy, S. C., Hintsa, E. J., Weinstock, E. M., and Bui, T. P.: Empirical age spectra for the lower tropical stratosphere from in situ observations of CO2: Implications for stratospheric transport, J. Geophys. Res., 104, 26581–26595, 1999. 
Andrews, A. E., Boering, K. A., Wofsy, S. C., Daube, B. C., Jones, D. B., Alex, S., Loewenstein, M., Podolske, J. R., and Strahan, S. E.: Empirical age spectra for the midlatitude lower stratosphere from in situ observations of CO2: Quantitative evidence for a subtropical “barrier” to transport, J. Geophys. Res., 106, 10257–10274, 2001. 
Birner, B., Chipperfield, M. P., Morgan, E. J., Stephens, B. B., Linz, M., Feng, W., Wilson, C., Bent, J. D., Wofsy, S. C., Severinghaus, J., and Keeling, R. F.: Gravitational separation of Ar/N2 and age of air in the lowermost stratosphere in airborne observations and a chemical transport model, Atmos. Chem. Phys., 20, 12391–12408, https://doi.org/10.5194/acp-20-12391-2020, 2020. 
Bönisch, H., Engel, A., Curtius, J., Birner, Th., and Hoor, P.: Quantifying transport into the lowermost stratosphere using simultaneous in-situ measurements of SF6 and CO2, Atmos. Chem. Phys., 9, 5905–5919, https://doi.org/10.5194/acp-9-5905-2009, 2009. 
Chelpon, S. M., Pan, L. L., Luo, Z. J., Atlas, E. L., Honomichi, S. B., and Smith, W. P.: Deriving tropospheric transit time spectra using airborne trace gas measurements: Uncertainty and information content, J. Geophys. Res., 126, 1–23, https://doi.org/10.1029/2020JD034358, 2021. 
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Short summary
The movement of air masses and the trace gases they contain from the Earth’s surface into the upper troposphere and lower stratosphere (UTLS) can have important implications for the radiative and chemical balance of the atmosphere. In this study we build on recent techniques and use new ones to estimate a range of transport diagnostics based on simultaneously measured trace gases in the UTLS during the monsoon season in North America.
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