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The interhemispheric gradient of SF$_6$ in the upper troposphere

Schuck, Tanja J. ; Degen, Johannes; Hintsa, Eric; Hoor, Peter; Jesswein, Markus; Keber, Timo; Kunkel, Daniel; Moore, Fred; Obersteiner, Florian ORCID iD icon 1; Rigby, Matt; Wagenhäuser, Thomas; Western, Luke M.; Zahn, Andreas 1; Engel, Andreas
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)

Abstract:

Anthropogenic trace gases often exhibit interhemispheric gradients because of larger emissions in
the Northern Hemisphere. Depending on a tracer’s emission pattern and sink processes, trace gas observations
can thus be used to investigate interhemispheric transport in the atmosphere. Vice versa, understanding inter-
hemispheric transport is important for interpreting spatial tracer distributions and for inferring emissions. We
combine several data sets from the upper troposphere (UT) to investigate the interhemispheric gradient of sulfur
hexafluoride (SF6) covering latitudes from ∼ 80◦ N to ∼ 60◦ S: canister sampling based measurements from the
IAGOS-CARIBIC infrastructure and data from the in-flight gas chromatography instruments GhOST (Gas chro-
matograph for Observational Studies using Tracers) and UCATS (Unmanned aircraft systems Chromatograph
for Atmospheric Trace Species). The interhemispheric gradient of SF6 in the UT is found to be weaker than
near the surface. Using the concept of a lag time removes the increasing trend from the time series. At the most
southern latitudes, a lag time of over 1 year with respect to the northern mid-latitude surface is derived, and lag
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Verlagsausgabe §
DOI: 10.5445/IR/1000168624
Veröffentlicht am 27.02.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000168624
HGF-Programm 12.11.13 (POF IV, LK 01) Long-term trends of global atmospheric composition
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 24
Heft 1
Seiten 689 – 705
Vorab online veröffentlicht am 17.01.2024
Nachgewiesen in Web of Science
Dimensions
Scopus
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