Article (Scientific journals)
Observed Hemispheric Asymmetry in Stratospheric Transport Trends From 1994 to 2018
Strahan, Susan E.; Smale, Dan; Douglass, Anne R. et al.
2020In Geophysical Research Letters, 47 (17), p. 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 :
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.
Ortega, Ivan
Palm, Mathias
Prignon, Maxime ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Robinson, John
Schneider, Matthias
Sussmann, Ralf
Velazco, Voltaire A.
More authors (7 more) Less
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 :
47
Issue :
17
Pages :
e2020GL088567
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 29 August 2020

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