 |
| Titel |
ICON-ART-ISO: Implementing water isotopologues into the new chemistry-transport model ICON-ART |
| VerfasserIn |
Johannes Eckstein, Roland Ruhnke, Stephan Pfahl, Daniel Rieger, Daniel Reinert |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132199
|
| Publikation (Nr.) |
 EGU/EGU2016-12682.pdf |
|
|
|
|
|
| Zusammenfassung |
| The stable isotopologues of water can help to understand processes that an airmass has
undergone and that have influenced the distribution of water in its different states in the
airmass. Measurements alone, by their limited temporal or spatial resolution, are often an
insufficient tool for unraveling these processes. An atmospheric model capable of simulating
the distribution of HDO and H218O at a high spatio-temporal resolution can therefore be
very useful for the interpretation of data and the study of processes. Here, we present
ICON-ART-ISO, the implementation of HDO and H218O into the new chemistry-transport
model ICON-ART.
The core of the model is the new ICOsahedral Non-hydrostatic (ICON) modelling
framework (Zaengl et al, 2014, Q. J. R. Meteorol. Soc.), a global model which allows to
locally increase resolution. It is used for numerical weather prediction at the German
Weather Service (DWD), but is also suitable for climate modelling. The model
system ICON-ART (Aerosols and Reactive Trace gases, Rieger et al, 2015 (GMD))
is a two-way coupled extension to ICON, which allows to study the influence of
aerosols and trace gases on the state of the atmosphere. We set up ICON-ART-ISO
within this framework, following the implementation of COSMOiso (Pfahl et al.,
2012 (ACP)), the isotope-enabled version of the COSMO model, the predecessor of
ICON.
In order to include the isotopologues in the model, the water cycle is doubled
diagnostically to mirror all processes dealing with water onto HDO and H218O. Processes
where isotopic fractionation has to be considered are the evaporation, the grid-scale formation
of clouds and precipitation and processes related to convection. Evaporation is limited to the
ocean surfaces in a first step. To consider grid-scale precipitation, the isotopologues have
been implemented into the two-moment microphysical scheme by Seifert and Beheng, 2005
(Meteorol. Atmos. Phys.), an extensive scheme considering many processes and four ice
classes. For convection, the Tiedtke-Bechtold scheme (Bechtold et al., 2013 (JAS)) is
used.
We present the current status of our developments. For a first validation and application,
we plan to investigate three tropical storms, comparing with data from the ongoing
measurement project CARIBIC (Civil Aircraft for the Regular Investigation of
the atmosphere Based on an Instrument Container, Brenninkmeijer, 2007 (ACP)). |
|
|
|
|
|
|