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. We present the new isotope-enabled model ICON-ART-Iso. The physics package ofthe global ICOsahedral Nonhydrostatic (ICON) modeling framework has beenextended to simulate passive moisture tracers and the stable isotopologues HDO and H 2 18 O . The extension builds on the infrastructureprovided by ICON-ART, which allows for high flexibility with respect to thenumber of related water tracers that are simulated. The physics ofisotopologue fractionation follow the model COSMOiso. We first present adetailed description of the physics of fractionation that have beenimplemented in the model. The model is then evaluated on a range of temporalscales by comparing with measurements of precipitation and vapor. A multi-annual simulation is compared to observations of the isotopologues inprecipitation taken from the station network GNIP (Global Network forIsotopes in Precipitation). ICON-ART-Iso is able to simulate the mainfeatures of the seasonal cycles in δD and δ18O as observed at the GNIP stations. In a comparison withIASI satellite retrievals, the seasonal and daily cycles in the isotopologuecontent 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 theperiod of two flights of the IAGOS-CARIBIC aircraft in September 2010, whichsampled air in the tropopause region influenced by Hurricane Igor. Thegeneral features of this sample as well as those of all tropical dataavailable from IAGOS-CARIBIC are captured by the model. The study demonstrates that ICON-ART-Iso is a flexible tool to analyze thewater cycle of ICON. It is capable of simulating tagged water as well as theisotopologues HDO and H 2 18 O .

From climatological to small-scale applications: simulating water isotopologues with ICON-ART-Iso (version 2.3)