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

Eichinger, Roland and Jöckel, Patrick and Brinkop, Sabine and Werner, Martin and Lossow, Stefan (2015) Simulation of the isotopic composition of stratospheric water vapour â Part 1: Description and evaluation of the EMAC model. Atmospheric Chemistry and Physics, 15 (10), pp. 5537-5555. Copernicus Publications. doi: 10.5194/acp-15-5537-2015. ISSN 1680-7316.

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Official URL: http://www.atmos-chem-phys.net/15/5537/2015/


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 H218O and their physical fractionation processes. Additionally an explicit computation of the contribution of methane oxidation to H2O 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 CH3D in the stratosphere has been confirmed by a comparison with chemical transport models (1-D, CHEM2D) and measurements from radiosonde flights. Finally, the simulated stratospheric HDO and the isotopic composition of water vapour have been evaluated, with respect to retrievals from three different satellite instruments (MIPAS, ACE-FTS, SMR). Discrepancies in stratospheric water vapour isotope ratios between two of the three satellite retrievals can now partly be explained.

Item URL in elib:https://elib.dlr.de/96627/
Document Type:Article
Additional Information:The authors thank the DFG (Deutsche Forschungsgemeinschaft) for funding the research group SHARP (Stratospheric Change and its Role for Climate Prediction, DFG Research Unit 1095); the presented study was conducted as part of R. Eichinger’s PhD thesis under grant number BR 1559/5-1.
Title:Simulation of the isotopic composition of stratospheric water vapour â Part 1: Description and evaluation of the EMAC model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Eichinger, RolandDLR, IPAhttps://orcid.org/0000-0001-6872-5700UNSPECIFIED
Date:21 May 2015
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 5537-5555
Publisher:Copernicus Publications
Keywords:H2O isotopologues, EMAC, Modular Earth Submodel System, stratospheric water vapour, tape recorde, methane oxidation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:12 Jun 2015 17:06
Last Modified:27 Nov 2023 12:50

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