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| Titel |
A fast stratospheric chemistry solver: the E4CHEM submodel for the atmospheric chemistry global circulation model EMAC |
| VerfasserIn |
A. J. G. Baumgaertner, P. Jöckel, B. Steil, H. Tost, R. Sander |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 3, no. 1 ; Nr. 3, no. 1 (2010-06-22), S.321-328 |
| Datensatznummer |
250000809
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| Publikation (Nr.) |
 copernicus.org/gmd-3-321-2010.pdf |
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| Zusammenfassung |
| The atmospheric chemistry general circulation model ECHAM5/MESSy (EMAC) and
the atmospheric chemistry box model CAABA are extended by a computationally
very efficient submodel for atmospheric chemistry, E4CHEM. It focuses on
stratospheric chemistry but also includes background tropospheric chemistry.
It is based on the chemistry of MAECHAM4-CHEM and is intended to serve as a
simple and fast alternative to the flexible but also computationally more
demanding submodel MECCA. In a model setup with E4CHEM, EMAC is now also
suitable for simulations of longer time scales. The reaction mechanism
contains basic O3, CH4, CO, HOx, NOx, and ClOx
gas phase chemistry. In addition, E4CHEM includes optional fast routines
for heterogeneous reactions on sulphate aerosols and polar stratospheric
clouds (substituting the existing submodels PSC and HETCHEM), and scavenging
(substituting the existing submodel SCAV). We describe the implementation of
E4CHEM into the MESSy structure of CAABA and EMAC. For some species the
steady state in the box model differs by up to 100% when compared to results
from CAABA/MECCA due to different reaction rates. After an update of the
reaction rates in E4CHEM the mixing ratios in both boxmodel and 3-D
model simulations are in satisfactory agreement with the results from a
simulation where MECCA with a similar chemistry scheme was employed. Finally,
a comparison against a simulation with a more complex and already evaluated
chemical mechanism is presented in order to discuss shortcomings associated
with the simplification of the chemical mechanism. |
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