The atmospheric chemistry box model CAABA/MECCA-3.0

Abstract

We present version 3.0 of the atmospheric chemistry box model CAABA/MECCA. In addition to a complete update of the rate coefficients to the most recent recommendations, a number of new features have been added: chemistry in multiple aerosol size bins; automatic multiple simulations reaching steady-state conditions; Monte-Carlo simulations with randomly varied rate coefficients within their experimental uncertainties; calculations along Lagrangian trajectories; mercury chemistry; more detailed isoprene chemistry; tagging of isotopically labeled species. Further changes have been implemented to make the code more user-friendly and to facilitate the analysis of the model results. Like earlier versions, CAABA/MECCA-3.0 is a community model published under the GNU General Public License

Tropical tropospheric ozone column retrieval for GOME-2

“…assimilated) synoptic scale meteorology is reproduced by the model . The gas phase chemistry is calculated by the submodel MECCA (Sander et al, 2011) with a comprehensive stratospheric and tropospheric chemistry mechanism including NMHC chemistry (up to C4 plus isoprene). Aqueous phase chemistry and wet-scavenging are simulated by the submodel SCAV , dry deposition by the submodel DRYDEP (Kerkweg et al, 2006a), primary emissions by the submodels ONLEM, OFFLEM and TNUDGE (Kerkweg et al, 2006b).…”

ORACLE 2-D (v2.0): an efficient module to compute the volatility and oxygen content of organic aerosol with a global chemistry–climate model

“…ECHAM5 (Roeckner et al, 2006) serves as the atmospheric dynamic core that simulates atmospheric flow and is integrated in the base model layer of MESSy. The interface structure of MESSy links the base model with several atmospheric submodels that online simulate gas-phase chemistry (MECCA; Sander et al, 2011), inorganic aerosol microphysics and dynamics (GMXe; Pringle et al, 2010), organic aerosol formation and growth (ORACLE; Tsimpidi et al, 2014), emissions (ONLEM and OFFLEM; Kerkweg et al, 2006b), dry deposition and sedimentation (DRYDEP and SEDI; Kerkweg et al, 2006a), cloud scavenging (SCAV; Tost et al, 2006), cloud microphysics (CLOUD; Bacer et al, 2018), and aerosol optical properties (AEROPT; Lauer et al, 2007). EMAC has been extensively described and evaluated against ground-based and satellite observations (Pozzer et al, 2012;Tsimpidi et al, 2014Tsimpidi et al, , 2016Tsimpidi et al, , 2017Karydis et al, 2016Karydis et al, , 2017.…”

Oxidation processes in the Eastern Mediterranean atmosphere: Evidence from the Modelling of HO<sub>x</sub> Measurements over Cyprus

“…For this study, we use the Module Efficiently Calculating the Chemistry of the Atmosphere (MECCA, Sander et al, 2011;Sander et al, 2005) , which is an atmospheric chemistry module that contains a comprehensive set of gas and aqueous phase chemical reaction mechanisms covering tropospheric and stratospheric chemistry. The gas phase chemistry in the present version contains 2664 species (including 40 dummy 30 species to account for deposition) and 1670 reactions, including basic O3, CH4, HOx, NOx, NMHC and sulfur chemistry.…”

“…The spectroradiometer was calibrated prior to the campaign using a 1000 W NIST traceable irradiance standard. Photolysis frequencies were calculated using molecular parameters recommended by the IUPAC and NASA evaluation panels (Sander et al, 2011;IUPAC, 2015). An automatic weather station (Vantage Pro2; Davis Instruments Corp., Hayward, CA) was used to measure temperature, pressure, wind direction 20 and speed, solar radiation and humidity with a time resolution of 1 min.…”