Effects of black carbon and boundary layer interaction on surface ozone in Nanjing, China

Zhu, Bin

doi:10.5194/acp-2017-1177

Cited by 12 publications

(20 citation statements)

References 24 publications

(24 reference statements)

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“…As the precursor of O 3 , simulation of NO 2 over the NCP, YRD, PRD, and SCB was acceptable, with the NMBs all falling within the benchmark and IOAs greater than 0.70. In general, the statistical metrics for O 3 and NO 2 are comparable with other studies (Gao et al, 2018;Hu et al, 2016). The variations of SO 2 in NCP and YRD were generally reproduced by the model with bias at −15.5 % and 24.55 %, respectively.…”

Section: Chemical Evaluationsupporting

confidence: 88%

Development of WRF/CUACE v1.0 model and its preliminary application in simulating air quality in China

et al. 2021

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Abstract. The development of chemical transport models with advanced physics and chemical schemes could improve air-quality forecasts. In this study, the China Meteorological Administration Unified Atmospheric Chemistry Environment (CUACE) model, a comprehensive chemistry module incorporating gaseous chemistry and a size-segregated multicomponent aerosol algorithm, was coupled to the Weather Research and Forecasting (WRF) framework with chemistry (WRF-Chem) using an interface procedure to build the WRF/CUACE v1.0 model. The latest version of CUACE includes an updated aerosol dry deposition scheme and the introduction of heterogeneous chemical reactions on aerosol surfaces. We evaluated the WRF/CUACE v1.0 model by simulating PM2.5, O3, NO2, and SO2 concentrations for January, April, July, and October (representing winter, spring, summer and autumn, respectively) in 2013, 2015, and 2017 and comparing them with ground-based observations. Secondary inorganic aerosol simulations for the North China Plain (NCP), Yangtze River Delta (YRD), and Sichuan Basin (SCB) were also evaluated. The model captured well the variations of PM2.5, O3, and NO2 concentrations in all seasons in eastern China. However, it is difficult to accurately reproduce the variations of air pollutants over SCB, due to its deep basin terrain. The simulations of SO2 were generally reasonable in the NCP and YRD with the bias at −15.5 % and 24.55 %, respectively, while they were poor in the Pearl River Delta (PRD) and SCB. The sulfate and nitrate simulations were substantially improved by introducing heterogeneous chemical reactions into the CUACE model (e.g., change in bias from −95.0 % to 4.1 % for sulfate and from 124.1 % to 96.0 % for nitrate in the NCP). Additionally, The WRF/CUACE v1.0 model was revealed with better performance in simulating chemical species relative to the coupled Fifth-Generation Penn State/NCAR Mesoscale Model (MM5) and CUACE model. The development of the WRF/CUACE v1.0 model represents an important step towards improving air-quality modeling and forecasts in China.

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Section: Chemical Evaluationsupporting

confidence: 88%

Development of WRF/CUACE v1.0 model and its preliminary application in simulating air quality in China

et al. 2021

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“…The responses of O 3 to reduced light absorption of BC during APEC are in the opposite direction (Gao et al, 2018c), compared to those for PM 2.5 . Strong absorption of BC tends to enhance photolysis above the aerosol layer, but to reduce photolysis near the ground.…”

Section: Influences On Boundary Layer Process and Air Pollutionmentioning

confidence: 76%

Reduced light absorption of black carbon (BC) and its influence on BC-boundary-layer interactions during “APEC Blue”

et al. 2021

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Abstract. Light absorption and radiative forcing of black carbon (BC) is influenced by both BC itself and its interactions with other aerosol chemical compositions. Although the changes in BC concentrations in response to emission reduction measures have been well documented, the influence of emission reductions on the light absorption properties of BC and its influence on BC-boundary-layer interactions has been less explored. In this study, we used the online coupled WRF-Chem model to examine how emission control measures during the Asia-Pacific Economic Cooperation (APEC) summit affect the mixing state and light absorption of BC, and the associated implications for BC-PBL interactions. We found that both the mass concentration of BC and the BC coating materials declined during the APEC week, which reduced the light absorption and light absorption enhancement (Eab) of BC. The reduced absorption aerosol optical depth (AAOD) during APEC was caused by both the decline in the mass concentration of BC itself (52.0 %), and the lensing effect of BC (48.0 %). The reduction in coating materials (39.4 %) contributed the most to the influence of the lensing effect, and the reduced light absorption capability (Eab) contributed 3.2 % to the total reduction in AAOD. Reduced light absorption of BC due to emission control during APEC enhanced planetary boundary layer height (PBLH) by 8.2 m. PM2.5 and O3 were found to have different responses to the changes in the light absorption of BC. Reduced light absorption of BC due to emission reductions decreased near-surface PM2.5 concentrations but near-surface O3 concentrations were enhanced in the North China Plain. These results suggest that current measures to control SO2, NOx, etc. would be effective in reducing the absorption enhancement of BC and in inhibiting the feedback of BC on the boundary layer. However, enhanced ground O3 might be a side effect of current emission control strategies. How to control emissions to offset this side effect of current emission control measures on O3 should be an area of further focus.

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“…Bond et al (2013) revealed that the warming efficiency of BC is much higher than that of CO 2 and other greenhouse gases (GHGs) with the same mass. Moreover, recent studies have found that the heating effect of BC can inhibit the upward development of the boundary layer, increase the frequency of heavy haze events, and affect the surface ozone concentration in China, indicating that the radiative effects of BC may further aggravate environmental problems (Ding et al, 2016;Gao et al, 2018). Hence, the identification of BC sources is needed to help the government manage and reduce BC emissions in a targeted and strategic way.…”

Section: Introductionmentioning

confidence: 99%

Regional and Sectoral Sources for Black Carbon Over South China in Spring and Their Sensitivity to East Asian Summer Monsoon Onset

et al. 2020

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Besides local emissions, biomass burning (BB) emissions in peninsula Southeast Asia (PSEA) and domestic anthropogenic emissions in North China (NC) are also significant black carbon (BC) sources over South China (SC) in spring. Meanwhile, the East Asian summer monsoon (EASM) is established with the wind field reversal, influencing the region-based contributions to BC over SC. Herein, BC sources for SC were tracked by region and by sector using the Community Earth System Model with a BC-tagging technique. During the spring of 2000-2014, 27% of BC surface concentration (BCS) and 64% of BC column burden (BCC) over SC stems from nonlocal sources. BC from NC is mainly transported below 850 hPa. It is the dominant nonlocal contribution to BCS (17%) and largely composed of residential and industrial sectors. Nonlocal emissions inside and outside China contribute 28% and 36% to BCC, respectively. Generally transported above 850 hPa, BC from PSEA is the largest nonlocal contributor (20%) to BCC and contributes 80% of BCC in BB sector. Additionally, the interannual variation in EASM onset times bring a maximum of −5% to +7%/−2% to +7% variation in BCC/BCS. The BC outflow/inflow contributed from NC dominates the BC decrease/increase over SC with southerly/northerly wind anomaly induced by early/late EASM onset, yet regional transport from PSEA contributes minor BC changes. The simulated BC is significantly positively correlated with the varying EASM onset times, but not with emissions, indicating the decisive role of meteorology in the interannual variation of BC over SC during springtime.

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Effects of black carbon and boundary layer interaction on surface ozone in Nanjing, China

Cited by 12 publications

References 24 publications

Development of WRF/CUACE v1.0 model and its preliminary application in simulating air quality in China

Development of WRF/CUACE v1.0 model and its preliminary application in simulating air quality in China

Reduced light absorption of black carbon (BC) and its influence on BC-boundary-layer interactions during “APEC Blue”

Regional and Sectoral Sources for Black Carbon Over South China in Spring and Their Sensitivity to East Asian Summer Monsoon Onset

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