Articles | Volume 21, issue 23
Atmos. Chem. Phys., 21, 17225–17241, 2021
Atmos. Chem. Phys., 21, 17225–17241, 2021
Research article
29 Nov 2021
Research article | 29 Nov 2021

Comparison of inorganic chlorine in the Antarctic and Arctic lowermost stratosphere by separate late winter aircraft measurements

Markus Jesswein et al.

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

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,, 2009. a
Butchart, N. and Remsberg, E. E.: The Area of the Stratospheric Polar Vortex as a Diagnostic for Tracer Transport on an Isentropic Surface, J. Atmos. Sci., 43, 1319–1339,<1319:TAOTSP>2.0.CO;2, 1986. a
Crutzen, P. J. and Arnold, F.: Nitric acid cloud formation in the cold Antarctic stratosphere: a major cause for the springtime “ozone hole”, Nature, 324, 651–655,, 1986. a
Daniel, J. S., Solomon, S., and Albritton, D. L.: On the evaluation of halocarbon radiative forcing and global warming potential, J. Geophys. Res., 100, 1271–1285,, 1995. a
DLR: The Basis HALO Measurement and Sensor System (BAHAMAS), available at: (last access: 25 August 2021), 2020. a
Short summary
This study presents and compares inorganic chlorine (Cly) derived from observations with the HALO research aircraft in the Antarctic late winter–early fall 2019 and the Arctic winter 2015–2016. Trend-corrected correlations from the Northern Hemisphere show excellent agreement with those from the Southern Hemisphere. After observation allocation inside and outside the vortex based on N2O measurements, results of the two campaigns reveal substantial differences in Cly within the respective vortex.
Final-revised paper