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The stable isotopic composition of molecular hydrogen in the tropopause region probed by the CARIBIC aircraft

Batenburg, A. M.; Schuck, T. J.; Baker, A.K.; Zahn, A.; Brenninkmeijer, C.A.M.; Röckmann, T.

More than 450 air samples that were collected in the upper troposphere – lower stratosphere (UTLS) region by the CARIBIC aircraft (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) have been analyzed for molecular hydrogen (H2) mixing ratios (χ¬(H2)) and H2 isotopic composition (deuterium content, δD).
More than 120 of the analyzed samples contained air from the lowermost stratosphere (LMS). These show that ¬ χ(H2) does not vary appreciably with O3-derived height above the thermal tropopause (TP), whereas δD does increase with height. The isotope enrichment is caused by H2 production and destruction processes that enrich the stratospheric H2 reservoir in deuterium (D); the exact shapes of the profiles are mainly determined by mixing of stratospheric with tropospheric air. Tight negative correlations are found between δD and the mixing ratios of methane (¬ χ(CH4)) and nitrous oxide (χ-(N2O)), as a result of the relatively long lifetimes of these three species. The correlations are described by δD[‰] = −0.35 · ¬χ(CH4)[ppb]+768 and δD[‰] = −1.90 · χ(N2O)[ppb]+745. These correlations are similar to previously published results and likely hold globally for the LMS. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000038933
Veröffentlicht am 06.04.2018
DOI: 10.5194/acp-12-4633-2012
Zitationen: 7
Web of Science
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2012
Sprache Englisch
Identifikator ISSN: 1867-1381
KITopen-ID: 1000038933
Erschienen in Atmospheric Measurement Techniques
Band 12
Seiten 4633-4646
Nachgewiesen in Web of Science
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