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Discussion papers | Copyright
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 20 Dec 2017

Model description paper | 20 Dec 2017

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

From climatological to small scale applications: Simulating water isotopologues with ICON-ART-Iso (version 2.1)

Johannes Eckstein1, Roland Ruhnke1, Stephan Pfahl2, Emanuel Christner1, Christoph Dyroff1,a, Daniel Reinert3, Daniel Rieger3, Matthias Schneider1, Jennifer Schröter1, Andreas Zahn1, and Peter Braesicke1 Johannes Eckstein et al.
  • 1Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
  • 2Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland
  • 3Deutscher Wetterdienst, Frankfurter Str. 135, 63067 Offenbach, Germany
  • anow at: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821, USA

Abstract. We present the new isotope enabled model ICON-ART-Iso. The physics of the global ICOsahedral Nonhydrostatic (ICON) modelling framework have been extended to simulate passive moisture tracers and the stable isotopologues HDO and H218O. The extension builds on the infrastructure provided by ICON-ART, which allows a high flexibility with respect to the number of related water tracers that are simulated. The physics of isotopologue fractionation follow the model COSMOiso. First, we present a detailed description of the physics of fractionation that have been implemented in the model. The model is then evaluated by comparing with measurements in precipitation and vapor representing a range of temporal scales.

A multi annual simulation is compared to observations of the isotopologues in precipitation taken from the station network GNIP (Global Network for Isotopes in Precipitation). ICON-ART-Iso is able to reasonably simulate the seasonal cycles in δD and δ18O as observed at the GNIP stations. In a comparison with IASI satellite retrievals, the seasonal and daily cycles in the isotopologue content of vapor are examined for different regions in the free troposphere. On a small spatial and temporal scale, ICON-ART-Iso is used to simulate the period of two flights of the IAGOS-CARIBIC aircraft in September 2010, which sampled air in the tropopause level influenced by Hurricane Igor. The general features of this sample as well as all of tropical data available from IAGOS-CARIBIC are captured by the model.

The study demonstrates that ICON-ART-Iso is a flexible tool to analyze the water cycle of ICON. It is capable of simulating tagged water as well as the isotopologues HDO and H218O.

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Johannes Eckstein et al.
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Johannes Eckstein et al.
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Publications Copernicus
Short summary
We present ICON-ART-Iso, an extension to the global circulation model ICON, which allows the simulation of the stable isotopologues of water. The main advantage over other isotope enabled models is its flexible design with respect to the number of tracers which are simulated. We compare results of several simulations to measurements of different scale. ICON-ART-Iso is able to reasonably reproduce the measurements. It is a promising tool to aid in the investigation of the atmospheric water cycle.
We present ICON-ART-Iso, an extension to the global circulation model ICON, which allows the...