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| Titel |
Technical note: Implementation of prescribed (OFFLEM), calculated (ONLEM), and pseudo-emissions (TNUDGE) of chemical species in the Modular Earth Submodel System (MESSy) |
| VerfasserIn |
A. Kerkweg, R. Sander, H. Tost, P. Jöckel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 11 ; Nr. 6, no. 11 (2006-09-04), S.3603-3609 |
| Datensatznummer |
250004075
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| Publikation (Nr.) |
 copernicus.org/acp-6-3603-2006.pdf |
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| Zusammenfassung |
| We present the submodels OFFLEM, ONLEM, and TNUDGE for the Modular Earth
Submodel System (MESSy). Prescribed emissions from input files are
handled by OFFLEM. ONLEM deals with online-calculated emissions, i.e.,
emissions that are calculated during the simulation. The submodel TNUDGE
uses the "tracer nudging" technique for pseudo-sources and -sinks. For
species with highly uncertain emission fluxes and/or with sufficiently long
lifetimes, e.g., CH4, it is common to create
such pseudo-fluxes by prescribing the observed mixing ratio of the
species at a given boundary (e.g., the mixing ratio of methane at the
surface, or the ozone mixing ratio at the tropopause). All three
submodels substantially simplify the inclusion of emissions into a
model. Specific emissions can easily be switched on or off. New
prescribed emissions can be included without rewriting any code. New
online emissions only require one additional subroutine containing the
new parameterization. A major advantage is that input fields at arbitrary
resolution can be used. The problem of incompatible grids between
emission data and model is overcome by utilizing the MESSy data import
interface. To further simplify the creation of new offline emission
data, the preprocessing program EDGAR2NC is provided. EDGAR2NC
transforms files from the EDGAR format into the netCDF format which
is required by OFFLEM. The presented routines are a part of the community
modeling project MESSy and can be made available for use to the atmospheric
modeling community. |
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