Articles | Volume 21, issue 9
https://doi.org/10.5194/acp-21-6627-2021
https://doi.org/10.5194/acp-21-6627-2021
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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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, https://doi.org/10.5194/acp-9-5905-2009, 2009. a, b
Bowman, K. P.: Transport of carbon monoxide from the tropics to the extratropics, J. Geophys. Res.-Atmos., 111, D02107, https://doi.org/10.1029/2005JD006137, 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, https://doi.org/10.1175/1520-0469(2002)059<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, https://doi.org/10.1175/1520-0469(1997)054<2045:IEBSMO>2.0.CO;2, 1997. a
Butchart, N.: The Brewer–Dobson circulation, Rev. Geophys., 52, 157–184, https://doi.org/10.1002/2013RG000448, 2014. a
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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.
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