A5103245775- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Plant responses to elevated CO2
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Heavy metals in environment
- Isotope Analysis in Ecology
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Plant Micronutrient Interactions and Effects
- Groundwater and Isotope Geochemistry
- Soil Carbon and Nitrogen Dynamics
- Toxic Organic Pollutants Impact
- Urban Stormwater Management Solutions
- Mercury impact and mitigation studies
- Agriculture Sustainability and Environmental Impact
- Climate Change Policy and Economics
- Phosphorus and nutrient management
- Heavy Metals in Plants
- Indoor Air Quality and Microbial Exposure
- Coastal wetland ecosystem dynamics
- Odor and Emission Control Technologies
China Agricultural University
2015-2024
Farmland Irrigation Research Institute
2022
Beijing Normal University
2005-2010
Institute of Earth Environment
2006
Fudan University
2006
Aerosol samples of PM2.5 and PM10 in a period intensive haze−fog (HF) events were collected to investigate the chemical characteristics air pollution Beijing. The quality HF episodes was much worse than that nonhaze−fog (NHF) days. concentrations elements water-soluble (WS) ions (K+, SO42-, NO3-) more 10 times higher those NHF Most species secondary (NH4+, showed significant difference between from westerly direction (HFW) southerly (HFS). HFS HFW, other lower HFW. sources areas on regional...
Abstract. A Nationwide Nitrogen Deposition Monitoring Network (NNDMN) containing 43 monitoring sites was established in China to measure gaseous NH3, NO2, and HNO3 particulate NH4+ NO3− air and/or precipitation from 2010 2014. Wet/bulk deposition fluxes of Nr species were collected by gauge method measured continuous-flow analyzer; dry estimated using airborne concentration measurements inferential models. Our observations reveal large spatial variations atmospheric concentrations wet/bulk...
China has experienced a dramatic change in atmospheric reactive nitrogen (Nr) emissions over the past four decades. However, it remains unclear how (N) deposition responded to increases and/or decreases Nr emissions. This study quantitatively assesses temporal and spatial variations measurements of bulk calculated dry N from 1980 2018. A long-term database (1980–2018) shows that peaked around 2000, had declined by 45% 2016–2018. Recent (based on monitoring 2011 2018) decreased 2018, with...
Abstract The effectiveness of national policies for air pollution control has been demonstrated, but the relative short-term emission reduction measures in comparison with not. Here we show that abatement during important international events substantially reduced PM 2.5 concentrations, quality rebounded to pre-event levels after ceased. Long-term adherence strict led successful decreases 54% concentrations Beijing, and 23% atmospheric nitrogen deposition China from 2012 2020. Incentivized...
Abstract. The implementation of strict emission control measures in Beijing and surrounding regions during the 2015 China Victory Day Parade provided a valuable opportunity to investigate related air quality improvements megacity. We measured NH3, NO2 PM2.5 at multiple sites outside summarized concentrations PM2.5, PM10, NO2, SO2 CO 291 cities across from national urban monitoring network between August September 2015. Consistently significant reductions 12–35 % for NH3 33–59 different areas...
Air pollution is one of the most serious environmental problems in China due to its rapid economic development alongside a very large consumption fossil fuel, particularly North Plain (NCP). During period 2011-2014, we integrated active and passive sampling methods perform continuous measurements NH3, HNO3, NO2, PM2.5 at two urban, suburban, rural sites NCP. The annual average concentrations HNO3 across five were ranges 8.5-23.0, 22.2-50.5, 5.5-9.7 μg m(-3), respectively, showing no...
Ammonia (NH3) plays a critical role in atmospheric chemistry and can exacerbate haze formation. Agricultural emissions have been known as primary source of global NH3. However, with accelerating urbanization optimized agricultural production, the dominance has become less clear. We investigated contributions nonagricultural sources to NH3 based on measurements isotopes at nine sites Quzhou County, typical county North China Plain. found that had extremely high concentrations (annual average...
Machine learning (ML) is an advanced computer algorithm that simulates the human process to solve problems. With explosion of monitoring data and increasing demand for fast accurate prediction, ML models have been rapidly developed applied in air pollution research. In order explore status applications research, a bibliometric analysis was made based on 2962 articles published from 1990 2021. The number publications increased sharply after 2017, comprising approximately 75% total....
The application of mineral and organic phosphorus fertilizers to arable land has greatly increased crop yield meet the world food demand. On other hand, impurities in these fertilizers, such as heavy metals, are being added agricultural soils, resulting both from raw materials themselves processes used obtain final product. Cadmium, a non-essential toxic metal, been found relatively high amounts common P obtained sediments. This metal poses risk for soil fertility, cultivation, plants...
This study investigates the concentrations and δ15N values of NH3 in Beijing during after 2020 COVID-19 lockdown. Higher lower δ15N-NH3(measured) were observed at most sites compared to 2017. Except for a site inside tunnel, did not increase significantly lockdown had ended those lockdown, while increased by 2.1-9.9‰. Nonagricultural sources (fossil fuel urban waste) overall contributed 81% 62% on-road (tunnel interior) nonroad (CAU) 2020, respectively, comparable 2017 (without significant...
Ammonia (NH3) emission reduction is key to limiting the deadly PM2.5 pollution globally. However, studies of long-term source apportionment vertical NH3 are relatively limited. On basis one-year measurements weekly profiles δ15N–NH3 at 5 heights (2, 15, 102, 180, and 320 m) on a 325-m meteorological tower in urban Beijing, we found that concentrations generally remained stable with height. increased obviously as function height cold seasons (with heating) decreased warm fertilization),...
Reducing atmospheric ammonia (NH3) emissions is critical to mitigating poor air quality. However, the contributions of major agricultural and non-agricultural source NH3 at receptor sites remain uncertain in many regions, hindering assessment implementation effective reduction strategies. This study conducted simultaneous measurements monthly concentrations stable nitrogen isotopes NHx (gaseous plus particulate NH4+) 16 across China. Ambient averaged 21.7 ± 19.6 μg m-3 rural sites, slightly...