Interactive coupling of a regional climate model and a chemical transport model: evaluation and preliminary results on ozone and aerosol feedback

Huszár, Peter; Mikšovský, Jiří; Pišoft, Petr; Belda, Michal; Halenka, Tomáš

doi:10.3354/cr01054

Cited by 26 publications

(45 citation statements)

References 68 publications

(82 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A very similar result is provided by Huszar et al (2012) both in terms of monthly and hourly variation.…”

Section: The Validation Of the Modeling Systemsupporting

confidence: 71%

“…Compared to Huszar et al (2012), our modeling system performs better in terms of correlation, with r = 0.6 and r = 0.67 for hourly and daily values against 0.51 and 0.53 in the later study which used an earlier version of the RegCMCAMx coupled system. This improvement probably lies in the duration of the data of comparison: in a 10-year time frame, the main drivers of the variability are the diurnal and monthly variations which contribute to an overall correlation in a significant way (Hogrefe et al, 2001).…”

Section: The Validation Of the Modeling Systemmentioning

confidence: 99%

“…They identified these metrics as the most important in assessing air quality model accuracy. Choosing these metrics further eases the comparison of the RegCMCAMx4 model performance with its former version presented in Huszar et al (2012) who applied the same metrics. The experiment 05BASE gave the base for the validation.…”

Section: Model Validationmentioning

confidence: 99%

“…It represents an interactive two-way coupled modeling framework where chemistry is driven by the climate model and the calculated con- centrations of the radiatively active gases and aerosols are fed back to the climate model's radiation code. RegCMCAMx4 is a more advanced version of the original RegCMCAMx couple described by Huszar et al (2012). The update interval for the meteorology from RegCM remained at 1 h which is sufficient (Grell and Baklanov, 2011).…”

Section: The Coupled Model Regcmcamx4mentioning

confidence: 99%

“…We also assumed, based on previous validation studies involving RegCM and CAMx that the capability of these models reproducing the state of the atmosphere (both P. Huszar et al: Urban emissions impact on air quality meteorology and chemistry) will not change significantly if coupling them online with respect to the case when they are coupled offline (e.g. Huszar et al, 2012).…”

Section: Atmosmentioning

confidence: 99%

See 4 more Smart Citations

On the long-term impact of emissions from central European cities on regional air quality

2016

View full text Add to dashboard Cite

Abstract. For the purpose of qualifying and quantifying the impact of urban emission from Central European cities on the present-day regional air quality, the regional climate model RegCM4.2 was coupled with the chemistry transport model CAMx, including two-way interactions. A series of simulations was carried out for the 2001-2010 period either with all urban emissions included (base case) or without considering urban emissions. Further, the sensitivity of ozone production to urban emissions was examined by performing reduction experiments with −20 % emission perturbation of NO x and/or non-methane volatile organic compounds (NMVOC).The modeling system's air quality related outputs were evaluated using AirBase, and EMEP surface measurements showed reasonable reproduction of the monthly variation for ozone (O 3 ), but the annual cycle of nitrogen dioxide (NO 2 ) and sulfur dioxide (SO 2 ) is more biased. In terms of hourly correlations, values achieved for ozone and NO 2 are 0.5-0.8 and 0.4-0.6, but SO 2 is poorly or not correlated at all with measurements (r around 0.2-0.5). The modeled fine particulates (PM 2.5 ) are usually underestimated, especially in winter, mainly due to underestimation of nitrates and carbonaceous aerosols.European air quality measures were chosen as metrics describing the cities emission impact on regional air pollution. Due to urban emissions, significant ozone titration occurs over cities while over rural areas remote from cities, ozone production is modeled, mainly in terms of number of exceedances and accumulated exceedances over the threshold of 40 ppbv. Urban NO x , SO 2 and PM 2.5 emissions also significantly contribute to concentrations in the cities themselves (up to 50-70 % for NO x and SO 2 , and up to 60 % for PM 2.5 ), but the contribution is large over rural areas as well (10-20 %). Although air pollution over cities is largely determined by the local urban emissions, considerable (often a few tens of %) fraction of the concentration is attributable to other sources from rural areas and minor cities. For the case of Prague (Czech Republic capital), it is further shown that the inter-urban interference between large cities does not play an important role which means that the impact on a chosen city of emissions from all other large cities is very small. At last, it is shown that to achieve significant ozone reduction over cities in central Europe, the emission control strategies have to focus on the reduction of NMVOC, as reducing NO x (due to suppressed titration) often leads to increased O 3 . The influence over rural areas is however always in favor of improved air quality, i.e. both NO x and/or NMVOC reduction ends up in decreased ozone pollution, mainly in terms of exceedances.

show abstract

“…A very similar result is provided by Huszar et al (2012) both in terms of monthly and hourly variation.…”

Section: The Validation Of the Modeling Systemsupporting

confidence: 71%

Section: The Validation Of the Modeling Systemmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: The Coupled Model Regcmcamx4mentioning

confidence: 99%

Section: Atmosmentioning

confidence: 99%

See 3 more Smart Citations

On the long-term impact of emissions from central European cities on regional air quality

2016

View full text Add to dashboard Cite

show abstract

Impact of anthropogenic aerosols on climate variability over Central Africa by using a regional climate model

et al. 2016

View full text Add to dashboard Cite

ABSTRACT:In the present study, we have investigated the impacts of anthropogenic aerosols on some relevant atmospheric parameters such as temperature, precipitation, wind and shortwave radiation. For this aim, we use the International Centre for Theoretical Physics (ICTP) regional climate model version 4 named RegCM4. Two sets of simulations with 1 year of spin-up, from 2001 to 2006, identical in their structure have been conducted: one includes the interactions of anthropogenic aerosols (ExpA) and another simulation which does not (Exp). In this regard, it should be noted that discrepancies between ExpA and Exp estimate the impact of the aerosol direct effect. The shortwave radiative forcing associated with the anthropogenic aerosols is negative throughout the entire domain with more negative values up to −6 W m -2 over the latitudinal band 0 ∘ -10 ∘ N during DJF accordingly to the main sources region. This induces cooling at surface higher than 0.4 ∘ C. Elsewhere over the raining area, the effect on precipitation is largely negative and the reduction can reach up to 1 mm day −1 . Moreover, the atmospheric circulation is not systematically affected even though we note a variation of wind speed in the vicinity of the latitudinal band 6 ∘ -10 ∘ N resembling a dipole pattern. The results also highlight that irrespective of the season, aerosols lead to enhance the moisture divergence mostly over the Guinea Gulf around Nigerian and Cameroonian coasts. This study provides evidence that anthropogenic aerosols influence climate variability and hydrological cycle mostly during dry season.

show abstract

Causes of Regional Change—Aerosols

Hansson

Bhend

2015

Regional Climate Studies

View full text Add to dashboard Cite

This chapter starts by introducing the complex nature of atmospheric aerosols, their sources, formation and properties and describes how they interact with clouds. This is important background information for discussing how aerosols affect climate, both directly and indirectly by affecting the radiative properties of clouds. The complexity of the aerosol-cloud-climate interaction causes large uncertainty in the projections of future climate. Results from different modelling studies on the European region are presented, and these show that the large spatial and temporal variations in atmospheric aerosol concentrations and properties have large regional differences in their effect on climate. This chapter concludes with an example of a co-beneficial global air quality and climate change mitigation scenario. IntroductionThis chapter starts by introducing the complex nature of atmospheric aerosols, their sources, formation and properties and describes how they interact with clouds. This is important background information for discussing how aerosols affect climate, both directly and indirectly by affecting the radiative properties of clouds. The complexity of the aerosol-cloud-climate interaction causes large uncertainty in the projections of future climate. Results from different modelling studies on the European region are presented, and these show that the large spatial and temporal variations in atmospheric aerosol concentrations and properties have large regional differences in their effect on climate. This chapter concludes with an example of a co-beneficial global air quality and climate change mitigation scenario.

show abstract

Interactive coupling of a regional climate model and a chemical transport model: evaluation and preliminary results on ozone and aerosol feedback

Cited by 26 publications

References 68 publications

On the long-term impact of emissions from central European cities on regional air quality

On the long-term impact of emissions from central European cities on regional air quality

Impact of anthropogenic aerosols on climate variability over Central Africa by using a regional climate model

Causes of Regional Change—Aerosols

Contact Info

Product

Resources

About