An integrated model study for Europe and North America using the Danish Eulerian Hemispheric Model with focus on intercontinental transport of air pollution

Brandt, Jørgen; Silver, Jeremy D.; Frohn, Lise M.; Geels, Camilla; Gross, Allan; Hansen, A. B.; Hansen, Kaj; Hedegaard, G. B.; Skjøth, Carsten Ambelas; Villadsen, Heidi; Zare, Azimeh; Christensen, J. H.

doi:10.1016/j.atmosenv.2012.01.011

Cited by 240 publications

(154 citation statements)

References 82 publications

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“…2a) without altering CMAQ or its input-output file structure. Polar stereographic projections are also used in the Danish Eulerian Hemispheric Model (Brandt et al, 2012) and a hemispheric version of the CHIMERE model (Mailler et al, 2017). Current WRF and CMAQ hemispheric applications have utilized a horizontal discretization of a 187 × 187 grid configuration with a grid spacing of 108 km and terrain-following σ vertical coordinate vertical coordinate system.…”

Section: Domain and Grid Configurationmentioning

confidence: 99%

Extending the Community Multiscale Air Quality (CMAQ) modeling system to hemispheric scales: overview of process considerations and initial applications

et al. 2017

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Abstract. The Community Multiscale Air Quality (CMAQ) modeling system is extended to simulate ozone, particulate matter, and related precursor distributions throughout the Northern Hemisphere. Modeled processes were examined and enhanced to suitably represent the extended space and timescales for such applications. Hemispheric-scale simulations with CMAQ and the Weather Research and Forecasting (WRF) model are performed for multiple years. Model capabilities for a range of applications including episodic longrange pollutant transport, long-term trends in air pollution across the Northern Hemisphere, and air pollution-climate interactions are evaluated through detailed comparison with available surface, aloft, and remotely sensed observations. The expansion of CMAQ to simulate the hemispheric scales provides a framework to examine interactions between atmospheric processes occurring on various spatial and temporal scales with physical, chemical, and dynamical consistency.

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Section: Domain and Grid Configurationmentioning

confidence: 99%

Extending the Community Multiscale Air Quality (CMAQ) modeling system to hemispheric scales: overview of process considerations and initial applications

et al. 2017

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“…Section 4 highlights the concluding remarks and an outlook for future studies. Christensen, 1997;Hedegaard et al, 2011;Brandt et al, 2012), with a two-way nesting capability to obtain higher resolution over limited areas (Frohn et al, 2002). The model is defined on a polar stereographic projection true at 60°N and is here applied with two domains -a mother domain with a resolution of 150 km × 150 km and a nested domain covering Europe with a resolution of 50 km × 50 km.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of two isoprene emission models for use in a long-range air pollution model

et al. 2012

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Abstract. Knowledge about isoprene emissions and concentration distribution is important for chemistry transport models (CTMs), because isoprene acts as a precursor for tropospheric ozone and subsequently affects the atmospheric concentrations of many other atmospheric compounds. Isoprene has a short lifetime, and hence it is very difficult to evaluate its emission estimates against measurements. For this reason, we coupled two isoprene emission models with the Danish Eulerian Hemispheric Model (DEHM), and evaluated the simulated background ozone concentrations based on different models for isoprene emissions. In this research, results of using the two global biogenic emission models; GEIA (Global Emissions Inventory Activity) and MEGAN (the global Model of Emissions of Gases and Aerosols from Nature) are compared and evaluated. The total annual emissions of isoprene for the year 2006 estimated by using MEGAN is 592 Tg yr −1 for an extended area of the Northern Hemisphere, which is 21 % higher than that estimated by using GEIA. The overall feature of the emissions from the two models is quite similar, but differences are found mainly in Africa's savannah and in the southern part of North America. Differences in spatial distribution of emission factors are found to be a key source of these discrepancies. In spite of the short life-time of isoprene, a direct evaluation of isoprene concentrations using the two biogenic emission models in DEHM has been made against available measurements in Europe. Results show an agreement between two models simulations and the measurements in general and that the CTM is able to simulate isoprene concentrations. Additionally, investigation of ozone concentrations resulting from the two biogenic emission models show that isoprene simulated by MEGAN strongly affects the ozone production in the African savannah; the effect is up to 10 % more than that obtained using GEIA. In contrast, the impact of using GEIA is higher in the Amazon region with more than 8 % higher ozone concentrations compared to that of using MEGAN. Comparing the ozone concentrations obtained by DEHM using the two different isoprene models with measurements from Europe and North America, show an agreement on the hourly, mean daily and daily maximum values. However, the average of ozone daily maximum value simulated by using MEGAN is slightly closer to the measured value for the average of all measuring sites in Europe.

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“…Results from the CAMx model were substantially underestimated and performance was poor for both January and July, with similar magnitude of error statistics. Also, the DEHM model (Brandt et al, 2012) underestimated PM 10 concentrations. The GEM-AQ model tends to overestimate PM 10 daily mean concentrations.…”

Section: Pm 10mentioning

confidence: 99%

“…Appel et al (2012) presented and discussed results obtained with the Community Multiscale Air Quality (CMAQ) model using different boundary conditions. Brandt et al (2012) reported modelling results with the Danish Eulerian Hemispheric Model (DEHM). Pirovano et al (2012) discussed differences in simulations with the Comprehensive Air Quality Model with Extensions (CAMx) and the CHIMERE model.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the GEM-AQ model in the context of the AQMEII Phase 1 project

et al. 2015

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Abstract. In the scope of the AQMEII Phase 1 project the GEM-AQ model was run over Europe for the year 2006. The modelling domain was defined using a global variable resolution grid with a rotated equator and uniform resolution of 0.2• over the European continent. Spatial distribution and temporal variability of the GEM-AQ model results were analysed for surface ozone and PM 10 concentrations. Model results were compared with measurements available in the ENSEMBLE database. Statistical measures were used to evaluate performance of the GEM-AQ model. The mean bias error, the mean absolute gross error and the Pearson correlation coefficient were calculated for the maximum 8 h running average ozone concentrations and daily mean PM 10 concentrations. The GEM-AQ model performance was characterized for station types, European climatic regions and seasons. The best performance for ozone was obtained at suburban stations, and the worst performance was obtained for rural stations where the model tends to underestimate. The best results for PM 10 were calculated for urban stations, while over most of Europe concentrations at rural sites were too high. Discrepancies between modelled and observed concentrations were discussed in the context of emission data uncertainty as well as the impact of large-scale dynamics and circulation of air masses. Presented analyses suggest that interpretation of modelling results is enhanced when regional climate characteristics are taken into consideration.

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An integrated model study for Europe and North America using the Danish Eulerian Hemispheric Model with focus on intercontinental transport of air pollution

Cited by 240 publications

References 82 publications

Extending the Community Multiscale Air Quality (CMAQ) modeling system to hemispheric scales: overview of process considerations and initial applications

Extending the Community Multiscale Air Quality (CMAQ) modeling system to hemispheric scales: overview of process considerations and initial applications

Evaluation of two isoprene emission models for use in a long-range air pollution model

Evaluation of the GEM-AQ model in the context of the AQMEII Phase 1 project

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