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The on-line coupled atmospheric chemistry model system MECO(n) — Part 5: Expanding the Multi-Model-Driver (MMD v2.0) for 2-way data exchange including data interpolation via GRID (v1.0)

Kerkweg, Astrid and Hofmann, Christiane and Jöckel, Patrick and Mertens, Mariano and Pante, Gregor (2018) The on-line coupled atmospheric chemistry model system MECO(n) — Part 5: Expanding the Multi-Model-Driver (MMD v2.0) for 2-way data exchange including data interpolation via GRID (v1.0). Geoscientific Model Development, 11 (3), pp. 1059-1076. Copernicus Publications. DOI: 10.5194/gmd-11-1059-2018 ISSN 1991-959X

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Official URL: https://www.geosci-model-dev.net/11/1059/2018/

Abstract

As part of the Modular Earth Submodel System (MESSy), the Multi-Model-Driver (MMD v1.0) was developed to couple online the regional Consortium for Small-scale Modeling (COSMO) model into a driving model, which can be either the regional COSMO model or the global European Centre Hamburg general circulation model (ECHAM) (see Part 2 of the model documentation). The coupled system is called MECO(n), i.e., MESSy-fied ECHAM and COSMO models nested n times. In this article, which is part of the model documentation of the MECO(n) system, the second generation of MMD is introduced. MMD comprises the message-passing infrastructure required for the parallel execution (multiple programme multiple data, MPMD) of different models and the communication of the individual model instances, i.e. between the driving and the driven models. Initially, the MMD library was developed for a one-way coupling between the global chemistry–climate ECHAM/MESSy atmospheric chemistry (EMAC) model and an arbitrary number of (optionally cascaded) instances of the regional chemistry–climate model COSMO/MESSy. Thus, MMD (v1.0) provided only functions for unidirectional data transfer, i.e. from the larger-scale to the smaller-scale models. Soon, extended applications requiring data transfer from the small-scale model back to the larger-scale model became of interest. For instance, the original fields of the larger-scale model can directly be compared to the upscaled small-scale fields to analyse the improvements gained through the small-scale calculations, after the results are upscaled. Moreover, the fields originating from the two different models might be fed into the same diagnostic tool, e.g. the online calculation of the radiative forcing calculated consistently with the same radiation scheme. Last but not least, enabling the two-way data transfer between two models is the first important step on the way to a fully dynamical and chemical two-way coupling of the various model instances. In MMD (v1.0), interpolation between the base model grids is performed via the COSMO preprocessing tool INT2LM, which was implemented into the MMD submodel for online interpolation, specifically for mapping onto the rotated COSMO grid. A more flexible algorithm is required for the backward mapping. Thus, MMD (v2.0) uses the new MESSy submodel GRID for the generalised definition of arbitrary grids and for the transformation of data between them. In this article, we explain the basics of the MMD expansion and the newly developed generic MESSy submodel GRID (v1.0) and show some examples of the abovementioned applications.

Item URL in elib:https://elib.dlr.de/119380/
Document Type:Article
Title:The on-line coupled atmospheric chemistry model system MECO(n) — Part 5: Expanding the Multi-Model-Driver (MMD v2.0) for 2-way data exchange including data interpolation via GRID (v1.0)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kerkweg, AstridMeteorologisches Institut Univ. BonnUNSPECIFIED
Hofmann, ChristianeMeteorologisches Institut Univ. BonnUNSPECIFIED
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Mertens, MarianoDLR, IPAhttps://orcid.org/0000-0003-3549-6889
Pante, GregorKIT IMK-TRO KarlsruheUNSPECIFIED
Date:16 March 2018
Journal or Publication Title:Geoscientific Model Development
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.5194/gmd-11-1059-2018
Page Range:pp. 1059-1076
Publisher:Copernicus Publications
ISSN:1991-959X
Status:Published
Keywords:EMAC, MESSy, MECO(n), Modular Earth Submodel System, Multi-Model-Driver, two-way-nestin, COSMO, GRID, grid transformation, remapping, multi-scale modelling, atmospheric chemistry, dust
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Transport und Klima
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:19 Mar 2018 08:45
Last Modified:02 May 2019 14:14

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