Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4)

Emmons, L. K.; Walters, Stacy; Hess, Peter; Lamarque, Jean‐François; Pfister, Gabriele; Fillmore, D.; Granier, Claire; Guenther, Alex; Kinnison, Douglas E.; Laepple, Thomas; Orlando, John J.; Tie, Xuexi; Tyndall, Geoffrey S.; Wiedinmyer, Christine; Baughcum, Steven L.; Kloster, S.

doi:10.5194/gmd-3-43-2010

Cited by 1,706 publications

(1,466 citation statements)

References 93 publications

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“…When the O 3 inflow from the boundaries was reduced by 30 %, model results were closer to observations. Based on these results and the MOZART-4 model evaluation (Emmons et al, 2010), O 3 inflow from the global model was reduced by 30 % in our study. Figure 2a shows the observed O 3 concentrations at the five air quality stations and the CYPHEX campaign and the modelled concentrations from (a) the base run using the RMS mechanism (blue) and (b) a simulation where initial O 3 concentrations and O 3 inflow from the global model were reduced by 30 % (red).…”

Section: Observational Datamentioning

confidence: 87%

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Air quality modelling in the summer over the eastern Mediterranean using WRF-Chem: chemistry and aerosol mechanism intercomparison

et al. 2018

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Abstract. We employ the WRF-Chem model to study summertime air pollution, the intense photochemical activity and their impact on air quality over the eastern Mediterranean. We utilize three nested domains with horizontal resolutions of 80, 16 and 4 km, with the finest grid focusing on the island of Cyprus, where the CYPHEX campaign took place in July 2014. Anthropogenic emissions are based on the EDGAR HTAP global emission inventory, while dust and biogenic emissions are calculated online. Three simulations utilizing the CBMZ-MOSAIC, MOZART-MOSAIC, and RADM2-MADE/SORGAM gas-phase and aerosol mechanisms are performed. The results are compared with measurements from a dense observational network of 14 ground stations in Cyprus. The model simulates T 2 m , P surf , and WD 10 m accurately, with minor differences in WS 10 m between model and observations at coastal and mountainous stations attributed to limitations in the representation of the complex topography in the model. It is shown that the south-eastern part of Cyprus is mostly affected by emissions from within the island, under the dominant (60 %) westerly flow during summertime. Clean maritime air from the Mediterranean can reduce concentrations of local air pollutants over the region during westerlies. Ozone concentrations are overestimated by all three mechanisms (9 % ≤ NMB ≤ 23 %) with the smaller mean bias (4.25 ppbV) obtained by the RADM2-MADE/SORGAM mechanism. Differences in ozone concentrations can be attributed to the VOC treatment by the three mechanisms. The diurnal variability of pollution and ozone precursors is not captured (hourly correlation coefficients for O 3 ≤ 0.29). This might be attributed to the underestimation of NO x concentrations by local emissions by up to 50 %. For the fine particulate matter (PM 2.5 ), the lowest mean bias (9 µg m −3 ) is obtained with the RADM2-MADE/SORGAM mechanism, with overestimates in sulfate and ammonium aerosols. Overestimation of sulfate aerosols by this mechanism may be linked to the SO 2 oxidation in clouds. The MOSAIC aerosol mechanism overestimates PM 2.5 concentrations by up to 22 µg m −3 due to a more pronounced dust component compared to the other two mechanisms, mostly influenced by the dust inflow from the global model. We conclude that all three mechanisms are very sensitive to boundary conditions from the global model for both gas-phase and aerosol pollutants, in particular dust and ozone.

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Section: Observational Datamentioning

confidence: 87%

“…The MOZART gas chemical mechanism, developed by Emmons et al (2010), is also used coupled with the MOSAIC aerosol scheme. It includes 85 chemical species and 196 reactions and is consistent with the chemistry used in the global model that provides the chemical boundary conditions for our simulations.…”

Section: Mozart-mosaic (Mm)mentioning

confidence: 99%

Air quality modelling in the summer over the eastern Mediterranean using WRF-Chem: chemistry and aerosol mechanism intercomparison

et al. 2018

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“…The National Center for Environmental Protection's (NCEP) North American Mesoscale (NAM) analysis data are used to set the initial and boundary conditions for WRF. Results from the global model MOZART-4/NCEP (Model for OZone and Related chemical Tracers 4) are used to set gas-and particle-phase initial and hourly-varying boundary conditions; more details can be found in Emmons et al (2010).…”

Section: Meteorology and Initial/boundary Conditionsmentioning

confidence: 99%

Multi-generational oxidation model to simulate secondary organic aerosol in a 3-D air quality model

et al. 2015

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Abstract. Multi-generational gas-phase oxidation of organic vapors can influence the abundance, composition and properties of secondary organic aerosol (SOA). Only recently have SOA models been developed that explicitly represent multigenerational SOA formation. In this work, we integrated the statistical oxidation model (SOM) into SAPRC-11 to simulate the multi-generational oxidation and gas/particle partitioning of SOA in the regional UCD/CIT (University of California, Davis/California Institute of Technology) air quality model. In the SOM, evolution of organic vapors by reaction with the hydroxyl radical is defined by (1) the number of oxygen atoms added per reaction, (2) the decrease in volatility upon addition of an oxygen atom and (3) the probability that a given reaction leads to fragmentation of the organic molecule. These SOM parameter values were fit to laboratory smog chamber data for each precursor/compound class. SOM was installed in the UCD/CIT model, which simulated air quality over 2-week periods in the South Coast Air Basin of California and the eastern United States. For the regions and episodes tested, the two-product SOA model and SOM produce similar SOA concentrations but a modestly different SOA chemical composition. Predictions of the oxygen-tocarbon ratio qualitatively agree with those measured globally using aerosol mass spectrometers. Overall, the implementation of the SOM in a 3-D model provides a comprehensive framework to simulate the atmospheric evolution of organic aerosol.

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“…The BASE simulation uses meteorological data from 2010 and makes use of the O 3 /OH oxidation scheme, with oxidant fields imported from the MOZART model [34].…”

Section: Methodsmentioning

confidence: 99%

Estimating Uncertainty in Global Mercury Emission Source and Deposition Receptor Relationships

et al. 2017

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Establishing mercury (Hg) source-receptor (SR) relationship matrices provides a tool to improve the understanding of the geographic relationship between regions of Hg release and its eventual deposition. SR relationship matrices are therefore a useful starting point for the development of policies aimed at reducing the impact of Hg emissions from anthropogenic activities (Hg anthr ) on sensitive ecosystems and areas potentially at risk of Hg contamination. A global Chemical Transport Model (CTM) has been used to simulate the emission, transport and fate of Hg anthr from 12 source regions, considering a range of uncertainty in the modelled chemical and physical processes. This ensemble of simulations gives an estimate of the Hg deposition which derives from each source region, as well as an estimate of the uncertainty of the calculated deposition flux. The uncertainty has been calculated using the bootstrap method to estimate this uncertainty in terms of the normalised confidence interval amplitude of the mean (NCIAM). Within the calculated confidence ranges, for almost all regions the contribution to the Hg deposition flux from remote sources is greater than that from domestic sources. Europe and South Asia, where the contributions are statistically indistinguishable, are exceptions, as is East Asia, with local sources dominating the Hg deposition flux. East Asia is the single most important remote source region for most receptor regions. The results yield such high uncertainties in the deposition flux for many receptor regions that the results are unlikely to be taken into consideration by policy makers. This uncertainty is particularly relevant when considering the "domestic" contribution to regional deposition, highlighting the need for more studies to resolve remaining uncertainties in the atmospheric Hg cycle, and Hg anthr emission inventories.

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Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4)

Cited by 1,706 publications

References 93 publications

Air quality modelling in the summer over the eastern Mediterranean using WRF-Chem: chemistry and aerosol mechanism intercomparison

Air quality modelling in the summer over the eastern Mediterranean using WRF-Chem: chemistry and aerosol mechanism intercomparison

Multi-generational oxidation model to simulate secondary organic aerosol in a 3-D air quality model

Estimating Uncertainty in Global Mercury Emission Source and Deposition Receptor Relationships

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