Impact of the Desert dust on the summer monsoon system over Southwestern North America

Zhao, Chun; Liu, Xiaohong; Leung, L. Ruby

doi:10.5194/acp-12-3717-2012

Cited by 91 publications

(94 citation statements)

References 50 publications

(65 reference statements)

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“…Several studies employing WRF-Chem reveal that aerosols reduce downward solar radiation reaching the ground, inhibit convection, reduce the PBL (planetary boundary layer) and, hence, make the lower atmosphere more stable (Fan et al, 2008;Forkel et al, 2012;Zhang et al, 2010). WRF-Chem results also indicate that aerosols can modify atmospheric circulation systems, resulting in changes in monsoon strength, precipitation distribution, and midlatitude cyclones (Zhao et al, 2011(Zhao et al, , 2012.…”

Section: B Zhang Et Al: Simulating Aerosol-radiation-cloud Feedbacksmentioning

confidence: 87%

Simulating aerosol–radiation–cloud feedbacks on meteorology and air quality over eastern China under severe haze conditionsin winter

2015

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Abstract. The aerosol-radiation-cloud feedbacks on meteorology and air quality over eastern China under severe winter haze conditions in January 2013 are simulated using the fully coupled online Weather Research and Forecasting/Chemistry (WRF-Chem) model. Three simulation scenarios including different aerosol configurations are undertaken to distinguish the aerosol's radiative (direct and semi-direct) and indirect effects. Simulated spatial and temporal variations of PM 2.5 are generally consistent with surface observations, with a mean bias of −18.9 µg m −3 (−15.0 %) averaged over 71 big cities in China. Comparisons between different scenarios reveal that aerosol radiative effects (direct effect and semidirect effects) result in reductions of downward shortwave flux at the surface, 2 m temperature, 10 m wind speed and planetary boundary layer (PBL) height by up to 84.0 W m −2 , 3.2 • C, 0.8 m s −1 , and 268 m, respectively. The simulated impact of the aerosol indirect effects is comparatively smaller. Through reducing the PBL height and stabilizing lower atmosphere, the aerosol effects lead to increases in surface concentrations of primary pollutants (CO and SO 2 ). Surface O 3 mixing ratio is reduced by up to 6.9 ppb (parts per billion) due to reduced incoming solar radiation and lower temperature, while the aerosol feedbacks on PM 2.5 mass concentrations show some spatial variations. Comparisons of model results with observations show that inclusion of aerosol feedbacks in the model significantly improves model performance in simulating meteorological variables and improves simulations of PM 2.5 temporal distributions over the North China Plain, the Yangtze River delta, the Pearl River delta, and central China. Although the aerosol-radiationcloud feedbacks on aerosol mass concentrations are subject to uncertainties, this work demonstrates the significance of aerosol-radiation-cloud feedbacks for real-time air quality forecasting under haze conditions.

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Section: B Zhang Et Al: Simulating Aerosol-radiation-cloud Feedbacksmentioning

confidence: 87%

Simulating aerosol–radiation–cloud feedbacks on meteorology and air quality over eastern China under severe haze conditionsin winter

2015

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“…In the version of COSMO-ART applied for the current study, there is the option of choosing between two different SOA modules: The SORGAM which is the default SOA module of COSMO-ART, analytically described in Schell et al (2001) and used in several applications (Grell et al, 2005;Stern et al, 2008;Elleman and Covert, 2009;Zhao et al, 2012;Chuang et al, 2011;Herwehe et al, 2011) and the VBS, which is the newly added SOA module in COSMO-ART, based on the framework proposed by Donahue et al (2006) and employed in other models (Robinson et al, 2007;Lane et al, 2008;Murphy and Pandis, 2009;Tsimpidi et al, 2010Tsimpidi et al, , 2011Shrivastava et al, 2011).…”

Section: Secondary Organic Aerosol Modulesmentioning

confidence: 99%

Modeling the meteorological and chemical effects of secondary organic aerosols during an EUCAARI campaign

Athanasopoulou

Vogel

et al. 2013

Atmos. Chem. Phys.

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Abstract.A volatility basis set (VBS) approach for the simulation of secondary organic aerosol (SOA) formation is incorporated in the online coupled atmospheric model system COSMO-ART and applied over Europe during the EU-CAARI May 2008 campaign. Organic aerosol performance is improved when compared to the default SOA module of COSMO-ART (SORGAM) against high temporal resolution aerosol mass spectrometer ground measurements. The impact of SOA on the overall radiative budget was investigated. The mean direct surface radiative cooling averaged over Europe is −1.2 W m −2 , representing approximately 20 % of the total effect of aerosols on the radiative budget. However, responses are not spatially correlated with the radiative forcing, due to the nonlinear interactions among changes in particle chemical composition, water content, size distribution and cloud cover. These interactions initiated by the effect of SOA on radiation are found to result even in a positive forcing in specific areas. Further model experiments showed that the availability of nitrogen oxides slightly affects SOA production, but that the aging rate constant used in the VBS approximation and boundary concentrations assumed in the model should be carefully selected. The aging of SOA is found to reduce hourly nitrate levels by up to 30 %, while the condensation of inorganic species upon pre-existing, SOA-rich particles results in a monthly average increase of 5 % in sulfate and ammonium formation in the accumulation mode.

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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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Impact of the Desert dust on the summer monsoon system over Southwestern North America

Cited by 91 publications

References 50 publications

Simulating aerosol–radiation–cloud feedbacks on meteorology and air quality over eastern China under severe haze conditionsin winter

Simulating aerosol–radiation–cloud feedbacks on meteorology and air quality over eastern China under severe haze conditionsin winter

Modeling the meteorological and chemical effects of secondary organic aerosols during an EUCAARI campaign

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

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