From climatological to small-scale applications: simulating water isotopologues with ICON-ART-Iso (version 2.3)
2018
Abstract. We present the new isotope-enabled model ICON-ART-Iso. The physics package of
the global ICOsahedral Nonhydrostatic (ICON) modeling framework has been
extended to simulate passive moisture tracers and the stable isotopologues
HDO and H 2 18 O . The extension builds on the infrastructure
provided by ICON-ART, which allows for high flexibility with respect to the
number of related water tracers that are simulated. The physics of
isotopologue fractionation follow the model COSMOiso. We first present a
detailed description of the physics of fractionation that have been
implemented in the model. The model is then evaluated on a range of temporal
scales by comparing with measurements of precipitation and vapor. 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 simulate the main
features of the seasonal cycles in δ D and
δ 18 O 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 region influenced by Hurricane Igor. The
general features of this sample as well as those of all 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 H 2 18 O .
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