Regional modeling of dust mass balance and radiative forcing over East Asia using WRF-Chem

Chen, Siyu; Zhao, Chun; Qian, Yun; Leung, L. Ruby; Huang, Jianping; Huang, Zhongwei; Bi, Jun; Wu, Zhongbiao; Shi, Jun; Yang, Leiku; Li, Deshuai; Li, Jinxin

doi:10.1016/j.aeolia.2014.02.001

Cited by 125 publications

(107 citation statements)

References 84 publications

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“…Since then, numerous new generations of on-line-coupled models have been developed worldwide, such as Multiscale Climate Chemistry Model (MCCM) (Grell et al, 2000), Weather Research and Forecasting-Chemistry (WRF-Chem) (Grell et al, 2005) and Global Environmental Multi-scale-Modeling Air quality and CHemistry (GEM-MACH) (Moran et al, 2010). These models have been widely used for Europe and North America and they found that the interactions between meteorology and chemistry can be significant during strong air pollution episodes (Grell et al, 2011;Konovalov et al, 2011;Wong et al, 2012;Chen et al, 2014;Kong et al, 2015;Liu et al, 2016).…”

Section: Wrf-chem Model Descriptionsmentioning

confidence: 99%

Impacts of aerosol-radiation feedback on local air quality during a severe haze episode in Nanjing megacity, eastern China

Li¹,

Wang²,

Xie³

et al. 2017

Tellus B: Chemical and Physical Meteorology

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Severe haze events and their radiation feedbacks exert a profound impact on the weather and tropospheric chemistry. Using the on-line-coupled Weather Research and Forecasting with Chemistry (WRF-Chem) model, this study investigates the impacts of direct aerosol-radiation feedbacks on local air quality (i.e. particulate matter and ozone photochemistry) during a severe autumn haze episode in Nanjing megacity, eastern China. Pronounced radiation feedbacks are found for the predictions of meteorological and chemical variables. In response to the negative radiative forcing of scattering-dominant anthropogenic haze aerosols, the instantaneous irradiance and temperature at the surface lower by 130 W m −2 and 1.1-1.4 °C, respectively, leading to a reduction of boundary layer height by 103.2-232.6 m (11-38%) and vertical wind speed by 0.1-0.8 mm s −1 (2-30% at mid-day) during this haze event. Such a stable atmosphere favours the accumulation of fine particles (30.5 μg m −3 , 28.7%) and NO 2 (6.0 ppb, 23.7%) in the urban pollution plume. The weaker turbulent mixing and photochemical activity associated with the enhanced titration loss, and reduced downward radiation and photolysis rate result in a 0.1−5.0 ppb (12.0%) reduction of near-surface ozone. The simulations highlight that the aerosol-radiation feedbacks play an important role in the atmospheric transport and chemistry of large urban pollution plumes.

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Section: Wrf-chem Model Descriptionsmentioning

confidence: 99%

Impacts of aerosol-radiation feedback on local air quality during a severe haze episode in Nanjing megacity, eastern China

Li¹,

Wang²,

Xie³

et al. 2017

Tellus B: Chemical and Physical Meteorology

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“…Since aerosols can modulate the radiation budget of the earth-atmosphere system, influence the climate and degrade air quality , they have long been attracting high attentions from scientific community (Twomey, 1977;Rosenfeld et al, 2004;Zhao et al, 2006a, b;Rosenfeld et al, 2007;Li et al, 2011;Koren et al, 2012;Zhao et al, 2012Zhao et al, , 2013aChen et al, 2014). Particularly with rapid urban growth and the development of various industries during the last decades, the high concentration of atmospheric pollutants has become a major environmental problem, which poses a threat to human health (Donaldson et al, 2001;Kan and Chen, 2004;Janssen et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Zheng

Yang

et al. 2015

Atmos. Chem. Phys.

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Abstract. Regional heavy pollution events in eastern China (110-122 • E, 28-40 • N) are causing serious environmental problems. In this study, the relationship between the degree of regional pollution and the patterns of large-scale atmospheric circulation over eastern China in October is investigated using 10-year (2001-2010) Terra/MODIS aerosol optical depth and NCEP reanalysis data by both case study and composite analysis. Eighteen polluted and 10 clean episodes are selected and categorised into six polluted types and three clean types respectively. Generally speaking, weather patterns such as a uniform surface pressure field in eastern China or a steady straight westerly in the middle troposphere, particularly when being at the rear of the anticyclone at 850 hPa, are typically responsible for heavy pollution events. Meanwhile, clean episodes occur when strong southeastward cold air advection prevails below the middle troposphere or air masses are transported from sea to land. Uniform descending motion prevails over the study region, trapping pollutants in the lower atmosphere. Therefore, the value of vertical velocity averaged from 1000 to 100 hPa and divergence of wind field in the lower troposphere are used in this study to quantify the diffusion conditions in each circulation type. The results reveal that it is often a clean episode when both the mean downward motion (larger than 2.56 × 10 −2 Pa s −1 ) and the divergence of lowlevel winds (larger than 1.79 × 10 −2 s −1 ) are strong. Otherwise, it is more likely to be a polluted episode.

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“…On the other hand, depending of the absorbing characteristics of the aerosols (mineral dust, black carbon …) they could energize convective clouds and thus increasing precipitation (Levin and Brenguier, 2009). Feedback effects can be particularly important during strong particles episodes (Konovalov et al, 2011;Chen et al, 2014;Wong et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of feedback effects in CBMZ/MOSAIC chemical mechanism

José

Pérez

Balzarini

et al. 2015

Atmospheric Environment

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a bstr a ctTo investigate the impact of the aerosol effects on meteorological variables and pollutant concentrations two simulations with the WRF-Chem model have been performed over Europe for year 2010. We have performed a baseline simulation without any feedback effects and a second simulation including the direct as well as the indirect aerosol effect. The paper describes the full configuration of the model, the simulation design, special impacts and evaluation. Although low aerosol particle concentrations are detected, the inclusion of the feedback effects results in an increase of solar radiation at the surface over cloudy areas (North-West, including the Atlantic) and decrease over more sunny locations (SouthEast). Aerosol effects produce an increase of the water vapor and decrease the planet boundary layer height over the whole domain except in the Sahara area, where the maximum particle concentrations are detected. Significant ozone concentrations are found over the Mediterranean area. Simulated feedback effects between aerosol concentrations and meteorological variables and on pollutant distributions strongly depend on the aerosol concentrations and the clouds. Further investigations are necessary with higher aerosol particle concentrations. WRF-Chem variables are evaluated using available hourly ob-servations in terms of performance statistics. Standardized observations from the ENSEMBLE system webinterface were used. The research was developed under the second phase of Air Quality Model Evaluation International Initiative (AQMEII). WRF-Chem demonstrates its capability in capturing tem-poral and spatial variations of the major meteorological variables and pollutants, except the wind speed over complex terrain. The wind speed bias may affect the accuracy in the chemical predictions (NO2, SO2). The analysis of the correlations between simulated data sets and observational data sets indicates that the simulation with aerosol effects performs slightly better. These results indicate potential importance of the aerosol feedback effects and an urgent need to further improve the representations in current atmospheric models to reduce uncertainties at all scales.

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Regional modeling of dust mass balance and radiative forcing over East Asia using WRF-Chem

Cited by 125 publications

References 84 publications

Impacts of aerosol-radiation feedback on local air quality during a severe haze episode in Nanjing megacity, eastern China

Impacts of aerosol-radiation feedback on local air quality during a severe haze episode in Nanjing megacity, eastern China

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Sensitivity of feedback effects in CBMZ/MOSAIC chemical mechanism

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