Articles | Volume 21, issue 9
Research article
03 May 2021
Research article |  | 03 May 2021

Asymmetry and pathways of inter-hemispheric transport in the upper troposphere and lower stratosphere

Xiaolu Yan, Paul Konopka, Marius Hauck, Aurélien Podglajen, and Felix Ploeger

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Transport into the polar stratosphere from the Asian monsoon region
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The efficiency of transport into the stratosphere via the Asian and North American summer monsoon circulations
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Observational evidence of particle hygroscopic growth in the upper troposphere–lower stratosphere (UTLS) over the Tibetan Plateau
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Multitimescale variations in modeled stratospheric water vapor derived from three modern reanalysis products
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How robust are stratospheric age of air trends from different reanalyses?
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Subject: Dynamics | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Stratosphere | Science Focus: Physics (physical properties and processes)
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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, b
Bowman, K. P.: Transport of carbon monoxide from the tropics to the extratropics, J. Geophys. Res.-Atmos., 111, D02107,, 2006. a
Bowman, K. P. and Carrie, G. D.: The Mean-Meridional Transport Circulation of the Troposphere in an Idealized GCM, J. Atmos. Sci., 59, 1502–1514,<1502:TMMTCO>2.0.CO;2, 2002. a
Bowman, K. P. and Cohen, P. J.: Interhemispheric Exchange by Seasonal Modulation of the Hadley Circulation, J. Atmos. Sci., 54, 2045–2059,<2045:IEBSMO>2.0.CO;2, 1997. a
Butchart, N.: The Brewer–Dobson circulation, Rev. Geophys., 52, 157–184,, 2014. a
Short summary
Inter-hemispheric transport is important for understanding atmospheric tracers because of the asymmetry in emissions between the Southern Hemisphere (SH) and Northern Hemisphere (NH). This study finds that the air masses from the NH extratropics to the atmosphere are about 5 times larger than those from the SH extratropics. The interplay between the Asian summer monsoon and westerly ducts triggers the cross-Equator transport from the NH to the SH in boreal summer and fall.
Final-revised paper