Exploring 2016–2017 surface ozone pollution over China: source contributions and meteorological influences

Lu, Xiao; Zhang, Lin; Chen, Youfan; Zhou, Mi; Zheng, Bo; Li, Ke; Liu, Yiming; Lin, Jian; Fu, Tzung‐May; Zhang, Qiang

doi:10.5194/acp-19-8339-2019

Cited by 265 publications

(161 citation statements)

References 93 publications

(97 reference statements)

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“…Increased soil NO x emissions alone then led to surface ozone enhanced by 3-5 ppbv (episodically up to 16 ppbv). Similar enhancements (May-August 2017 vs. 2016) of soil NO x emissions (~25%) and surface ozone (1-2 ppbv) due to warmer climate were simulated over the industrial eastern China [119]. For future projections, modeling studies predict significant enhancement of soil NO x emissions driven by climate change (e.g.,~23% higher in 2100 compared to 2000 in IPCC A2 emission scenario, [61,108]), underlying future climate will likely degrade ozone air quality via increasing soil NO x emissions.…”

Section: Soil No X Emissionmentioning

confidence: 60%

Meteorology and Climate Influences on Tropospheric Ozone: a Review of Natural Sources, Chemistry, and Transport Patterns

2019

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Tropospheric ozone is a key air pollutant and greenhouse gas. Its fate strongly depends on meteorological conditions and therefore subject to climate change influences. Such dependences through biogenic, chemical, and dynamic processes on different spatiotemporal scales have been unraveled from observations and modeling studies. In this process-oriented review, we summarize three dominant pathways of meteorological and climatic impacts on tropospheric ozone and present their recent progress. The three pathways are influences through changes in the natural precursor emissions, the kinetics and partitioning of chemistry and deposition, and the transport of ozone and its precursors. Tropospheric ozone levels have shown significant global or regional responses to meteorological/climatic changes (e.g., changes in the Brewer-Dobson Circulation, the Hadley Circulation, and El Niño-Southern Oscillation) and can be explained through the conjunction of these pathways. Most recent model projections predict that future climate will increase surface ozone in polluted regions and decrease ozone at a global scale due to stronger ozone chemical loss. However, uncertainties in climate-ozone responses and limitations in model capability still challenge the magnitude and even the sign of such projections. We highlight the rising importance of future increase of stratosphere-troposphere exchange in modulating tropospheric ozone that may largely compensate the predicted chemical loss of tropospheric ozone burden. We also highlight that uncertainties in isoprene chemistry, biogenic emissions in changing CO 2 levels and vegetation, and interactions between ozone and vegetation may largely affect the surface ozone response to climate change. Future research and model improvements are required to fill these gaps.

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Section: Soil No X Emissionmentioning

confidence: 60%

Meteorology and Climate Influences on Tropospheric Ozone: a Review of Natural Sources, Chemistry, and Transport Patterns

2019

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“…Great efforts have been devoted to improving understanding of exceptionally high concentrations (Wang et al, 2006) and the increasing trend in O 3 for both China and India (Beig et al, 2007;Cheng et al, 2016;Ghude et al, 2008;Lu et al, 2018a;Ma et al, 2016;Saraf and Beig, 2004;Xu et al, 2008). Strong but distinctive seasonal variations in O 3 observed in India and China have been linked to higher emissions of precursor gases (Lal et al, 2000) and summer monsoons (Kumar et al, 2010;Lu et al, 2018b;Wang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Ozone pollution over China and India: seasonality and sources

Gao

Zhu

et al. 2020

Atmos. Chem. Phys.

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A regional fully coupled meteorology-chemistry model, Weather Research and Forecasting model with Chemistry (WRF-Chem), was employed to study the seasonality of ozone (O 3 ) pollution and its sources in both China and India. Observations and model results suggest that O 3 in the North China Plain (NCP), Yangtze River Delta (YRD), Pearl River Delta (PRD), and India exhibit distinctive seasonal features, which are linked to the influence of summer monsoons. Through a factor separation approach, we examined the sensitivity of O 3 to individual anthropogenic, biogenic, and biomass burning emissions. We found that summer O 3 formation in China is more sensitive to industrial and biogenic sources than to other source sectors, while the transportation and biogenic sources are more important in all seasons for India. Tagged simulations suggest that local sources play an important role in the formation of the summer O 3 peak in the NCP, but sources from Northwest China should not be neglected to control summer O 3 in the NCP. For the YRD region, prevailing winds and cleaner air from the ocean in summer lead to reduced transport from polluted regions, and the major source region in addition to local sources is Southeast China. For the PRD region, the upwind region is replaced by contributions from polluted PRD as autumn approaches, leading to an autumn peak. The major upwind regions in autumn for the PRD are YRD (11 %) and Southeast China (10 %). For India, sources in North India are more important than sources in the south. These analyses emphasize the relative importance of source sectors and regions as they change with seasons, providing important implications for O 3 control strategies.

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“…Also, model simulations suggest that the reduction of PM can stimulate O3 production by slowing down the aerosol sink of hydroperoxyl radicals [20]. In the other hand, more emission of O3 precursors, VOCs, can make O3 pollution more complicated due to nonlinear VOC/NOx ratios [36]. Therefore, stricter control measurements should be taken accordingly, due to the favorable environment for O3 Despite the rapid decline in PM 2.5 concentration, regional O 3 pollution in summer has been a major air quality problem in eastern China.…”

Section: Influence and Implication Of Drastic Changes In Aerosol Propmentioning

confidence: 99%

Reversal of Aerosol Properties in Eastern China with Rapid Decline of Anthropogenic Emissions

et al. 2020

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The clean air actions of the Chinese government since 2013 have led to rapid reduction in anthropogenic emissions during the last five years. In this study, we present a regional-scale insight into the transition of aerosol properties during this special period based on integrated Moderate Resolution Imaging Spectroradiometer (MODIS), Multi-angle Imaging Spectroradiometer (MISR), and ground-based AERONET (AErosol RObotic NETwork) observations. As a response, aerosols in eastern China have exhibited notable reversal in both the amount and optical properties. Regional haze pollution with Aerosol Optical Depth (AOD) > 1.0 in northern China declined from more than ~80 days per year to less than ~30 days. While fine-mode particles exhibited a continuous decrease by ~30-40% during the time period of 2013–2018, the levels of coarse aerosols had no regular variations. MISR fraction AOD of different size modes shows that there has been an obvious overall decline in coarse particles over eastern China, but natural sources such as long-range dust transport make a considerable contribution. The Single Scattering Albedo (SSA) increased steadily from 2001 to 2012 by more than ~0.05. In contrast, aerosol absorption has been getting stronger since 2013, with SSA increasing by ~0.03, due to a much larger reduction in sulfate and nitrate. The drastic transition of aerosol properties has greatly changed aerosol radiative forcing (ARF) in eastern China. The negative ARF at the top (TOA) and bottom (BOA) of the atmosphere decreased by ~30 and ~50 W/m2, respectively, in Beijing during the 2001–2012 period. Although aerosol loading continued to decline after 2013, the magnitudes of TOA and BOA ARF have increased by ~10 and ~30 W/m2, respectively, since 2013, due largely to the enhanced aerosol absorption. Our results suggest that more comprehensive observations are needed to improve understanding of the intense climate and environment effects of dramatic aerosol properties in eastern China.

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Exploring 2016–2017 surface ozone pollution over China: source contributions and meteorological influences

Cited by 265 publications

References 93 publications

Meteorology and Climate Influences on Tropospheric Ozone: a Review of Natural Sources, Chemistry, and Transport Patterns

Meteorology and Climate Influences on Tropospheric Ozone: a Review of Natural Sources, Chemistry, and Transport Patterns

Ozone pollution over China and India: seasonality and sources

Reversal of Aerosol Properties in Eastern China with Rapid Decline of Anthropogenic Emissions

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