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Simulation of the isotopic composition of stratospheric water vapour - Part 1: Description and evaluation of the EMAC model

Eichinger, R.; Jöckel, P.; Brinkop, S.; Werner, M.; Lossow, S.

This modelling study aims at an improved understanding of the processes that determine the water vapour budget in the stratosphere by means of the investigation of water isotope ratios. An additional (and separate from the actual) hydrological cycle has been introduced into the chemistry–climate model EMAC, including the water isotopologues HDO and H$_{2}$$^{18}$O and their physical fractionation processes. Additionally an explicit computation of the contribution of methane oxidation to H$_{2}$O and HDO has been incorporated. The model expansions allow detailed analyses of water vapour and its isotope ratio with respect to deuterium throughout the stratosphere and in the transition region to the troposphere. In order to assure the correct representation of the water isotopologues in the model’s hydrological cycle, the expanded system has been evaluated in several steps. The physical fractionation effects have been evaluated by comparison of the simulated isotopic composition of precipitation with measurements from a ground-based network (GNIP) and with the results from the isotopologue-enabled general circulation model ECHAM5-wiso. The model’s representation of the chemical HDO precursor CH$_{3}$D in the stratosphere has been confirmed by a comparison with chemical transport models (1-D, CHEM2D) and measurements from radiosonde flights. ... mehr

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DOI: 10.5445/IR/1000058070
DOI: 10.5194/acp-15-5537-2015
Zitationen: 12
Web of Science
Zitationen: 10
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000058070
HGF-Programm 12.04.05 (POF III, LK 01) Trends,Variaility,Large-Scale Processes
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 15
Heft 10
Seiten 5537-5555
Nachgewiesen in Dimensions
Web of Science
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