Development cycle 2 of the Modular Earth Submodel System (MESSy2)

Abstract

The Modular Earth Submodel System (MESSy) is an open, multi-institutional project providing a strategy for developing comprehensive Earth System Models (ESMs) with highly flexible complexity. The first version of the MESSy infrastructure and process submodels, mainly focusing on atmospheric chemistry, has been successfully coupled to an atmospheric General Circulation Model (GCM) expanding it into an Atmospheric Chemistry GCM (AC-GCM) for nudged simulations and into a Chemistry Climate Model (CCM) for climate simulations. <br><br> Here, we present the second development cycle of MESSy, which comprises (1) an improved and extended infrastructure for the basemodel independent coupling of process-submodels, (2) new, highly valuable diagnostic capabilities for the evaluation with observational data and (3) an improved atmospheric chemistry setup. With the infrastructural changes, we place the headstone for further model extensions from a CCM towards a comprehensive ESM. The new diagnostic submodels will be used for regular re-evaluations of the continuously further developing model system. The updates of the chemistry setup are briefly evaluated

Tropical tropospheric ozone column retrieval for GOME-2

“…Tropospheric NO 2 columns provide valuable information on NO x emissions, and are useful to understand the effect of temporal and spatial variations in NO x emissions on the tropical tropospheric ozone distribution in the tropics. Finally, we illustrate the use of GOME-2 tropospheric ozone measurements in evaluating the chemistry climate model (CCM) EMAC (Jöckel et al, 2010). This exercise provides some insight into the possibilities of using this comprehensive data set to help to assess the quality of model results; it is the foundation for improving our understanding of processes driving atmospheric changes.…”

“…EMAC is a numerical chemistry and climate simulation system that includes sub-models describing tropospheric and middle atmosphere processes and their interaction with oceans, land and human influences (Jöckel et al, 2010). It uses the second version of the Modular Earth Submodel System (MESSy2) to link multi-institutional computer codes.…”

Earth System Chemistry integrated Modelling (ESCiMo) with the Modular Earth Submodel System (MESSy) version 2.51

“…2 documents briefly (mainly for the users of it) the updates of the MESSy and the EMAC model since Jöckel et al (2010), Sect. 3 describes the model set-ups, and Sect.…”

Uncertainties of fluxes and <sup>13</sup>C ∕ <sup>12</sup>C ratios of atmospheric reactive-gas emissions

“…Further details of the emission processes implementation in EMAC and the corresponding model parameterisations are given by Kerkweg et al (2006), Jöckel et al (2006Jöckel et al ( , 2010, Pozzer et al (2007Pozzer et al ( , 2009. In the next sections we describe chiefly the choice of the isotope emission signatures for the model set-ups including stable carbon isotopes.…”

“…In the first part (Sect. 2), we briefly reiterate the implementation of the trace gas emissions in the evaluation set-up of the EMAC model (MESSy Development Cycle2, Jöckel et al, 2010, referred to hereafter as EVAL 2 ) and supplement it with the formulation used to separate isotope emission fluxes. Furthermore, we derive some practical approaches with which to calculate combined flux/isotope ratio uncertainties of emissions in Sect.…”