Observed Hemispheric Asymmetry in Stratospheric Transport Trends From 1994 to 2018

Strahan, Susan E.; Smale, Dan; Douglass, Anne R.; Blumenstock, Thomas; Hannigan, James W.; Hase, Frank; Jones, Nicholas B.; Mahieu, Emmanuel; Notholt, Justus; Oman, Luke D.; Ortega, Ivan; Palm, Mathias; Prignon, Maxime; Robinson, John; Schneider, Matthias; Sussmann, Ralf; Velazco, Voltaire A.

doi:10.1029/2020GL088567

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Observed Hemispheric Asymmetry in Stratospheric Transport Trends From 1994 to 2018

Strahan, Susan E.; Smale, Dan; Douglass, Anne R. et al.

2020 • In Geophysical Research Letters, 47 (17), p. 2020GL088567

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https://hdl.handle.net/2268/250395

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10.1029/2020GL088567

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Keywords :

stratospheric transport; age of air; transport trends; dynamical variability; long term trend; FTIR monitoring

Abstract :

[en] Abstract Total columns of the trace gases nitric acid (HNO3) and hydrogen chloride (HCl) are sensitive to variations in the lower stratospheric age of air, a quantity that describes transport time scales in the stratosphere. Analyses of HNO3 and HCl columns from the Network for the Detection of Atmospheric Composition Change panning 77°S to 79°N have detected changes in the extratropical stratospheric transport circulation from 1994 to 2018. The HNO3 and HCl analyses combined with the age of air from a simulation using the MERRA2 reanalysis show that the Southern Hemisphere lower stratosphere has become 1 month/decade younger relative to the Northern Hemisphere, largely driven by the Southern Hemisphere transport circulation. The analyses reveal multiyear anomalies with a 5- to 7-year period driven by interactions between the circulation and the quasi-biennial oscillation in tropical winds. This hitherto unrecognized variability is large relative to hemispheric transport trends and may bias ozone trend regressions.

Research Center/Unit :

Sphères - SPHERES

Disciplines :

Earth sciences & physical geography

Author, co-author :

Strahan, Susan E.

Smale, Dan

Douglass, Anne R.

Blumenstock, Thomas

Hannigan, James W.

Hase, Frank

Jones, Nicholas B.

Mahieu, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)

Notholt, Justus

Oman, Luke D.

More authors (7 more)

Language :

English

Title :

Observed Hemispheric Asymmetry in Stratospheric Transport Trends From 1994 to 2018

Publication date :

29 August 2020

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Wiley, Washington, United States - District of Columbia

Volume :

Issue :

Pages :

e2020GL088567

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL088567

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

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since 29 August 2020

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