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Technical Note: Implementation of Prescribed (Offlem), Calculated (Onlem), and Pseudo-emissions (Tnudge) of Chemical Species in the Modular Earth Submodel System (Messy) : Volume 6, Issue 3 (27/06/2006)

By Kerkweg, A.

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Book Id: WPLBN0003983486
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: Technical Note: Implementation of Prescribed (Offlem), Calculated (Onlem), and Pseudo-emissions (Tnudge) of Chemical Species in the Modular Earth Submodel System (Messy) : Volume 6, Issue 3 (27/06/2006)  
Author: Kerkweg, A.
Volume: Vol. 6, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Tost, H., Sander, R., Jöckel, P., & Kerkweg, A. (2006). Technical Note: Implementation of Prescribed (Offlem), Calculated (Onlem), and Pseudo-emissions (Tnudge) of Chemical Species in the Modular Earth Submodel System (Messy) : Volume 6, Issue 3 (27/06/2006). Retrieved from http://www.ebooklibrary.org/


Description
Description: Air Chemistry Department, Max-Planck Institute of Chemistry, P.O. Box 3060, 55020 Mainz, Germany. 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.

Summary
Technical Note: Implementation of prescribed (OFFLEM), calculated (ONLEM), and pseudo-emissions (TNUDGE) of chemical species in the Modular Earth Submodel System (MESSy)

 

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