A5053698171- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Remote Sensing and Land Use
- Groundwater flow and contamination studies
- Environmental and Agricultural Sciences
- Heavy metals in environment
- Climate Change and Health Impacts
- Hydrology and Watershed Management Studies
- Urban Stormwater Management Solutions
- Aeolian processes and effects
- Geophysics and Gravity Measurements
- Environmental Quality and Pollution
- Wind and Air Flow Studies
- Indoor Air Quality and Microbial Exposure
- Hydrocarbon exploration and reservoir analysis
- Heavy Metal Exposure and Toxicity
- Salmonella and Campylobacter epidemiology
- Climate variability and models
- Heavy Metals in Plants
Institute of Atmospheric Physics
2015-2024
Chinese Academy of Sciences
2015-2024
University of Chinese Academy of Sciences
2018-2024
Institute of Urban Environment
2018-2024
Shihezi University
2024
Shandong Agricultural University
2024
Beijing Normal University
2019-2024
Yunnan University
2023
Energy Foundation
2023
Nanjing Institute of Environmental Sciences
2023
Abstract China experienced severe haze pollution in January 2013. Here we have a detailed characterization of the sources and evolution mechanisms this with focus on four episodes that occurred during 10–14 Beijing. The main source data analyzed is from submicron aerosol measurements by an Aerodyne Aerosol Chemical Speciation Monitor. average PM1 mass concentration ranged 144 to 300 µg m −3 , which was more than 10 times higher observed clean periods. All species showed substantial increases...
Abstract. Winter has the worst air pollution of year in megacity Beijing. Despite extensive winter studies recent years, our knowledge sources, formation mechanisms and evolution aerosol particles is not complete. Here we have a comprehensive characterization variations processes submicron aerosols that were measured by an Aerodyne high-resolution mass spectrometer from 17 December 2013 to January 2014 along with offline filter analysis gas chromatography/mass spectrometry. Our results...
Secondary organic aerosol (SOA) constitutes a large fraction of OA, yet remains source significant uncertainties in climate models due to incomplete understanding its formation mechanisms and evolutionary processes. Here we evaluated the effects photochemical aqueous-phase processing on SOA composition oxidation degrees three seasons Beijing, China, using high-resolution mass spectrometer measurements along with positive matrix factorization. Our results show that has dominant impact more...
Abstract Air quality has been continuously improved in recent years Beijing, yet severe haze episodes still frequently occur winter. Here we deployed an Aerodyne high‐resolution aerosol mass spectrometer two winter seasons during the same period to investigate changes chemistry from 2014 2016 Beijing. Compared 2014, submicron (PM 1 ) species showed ubiquitous increases concentrations by 10–130% 2016, of which nitrate largest increase among all leading a much higher NO 3 /SO 4 ratio (1.36 ±...
Abstract China implemented strict emission control measures in Beijing and surrounding regions to ensure good air quality during the 2014 Asia-Pacific Economic Cooperation (APEC) summit. We conducted synchronous aerosol particle measurements with two mass spectrometers at different heights on a meteorological tower urban investigate variations particulate composition, sources size distributions response controls. Our results show consistently large reductions secondary inorganic (SIA) of...
The Nested Air Quality Prediction Model System (NAQPMS) was used to investigate an extreme regional haze episode persisting over the Beijing-Tianjin-Hebei megacity cluster from November 26 December 1, 2015. During this event, daily mean PM2.5 exceeded 500 μg/m3. We found that local emissions were main source of Beijing and Hebei in early formational stage episode. accumulation regionally transported, highly aged secondary inorganic aerosols (SIA) along foot mountains responsible (60%) for...
Aerosol particle samples collected in spring 2002 Beijing were analyzed to investigate the impact of transport pathways on chemical composition Asian dust storms (DSs). The divided into two episodes (i.e., DS I and II), which transported along different identified by back‐trajectory PM 10 concentrations. pathway from westerly direction could be seen as “polluted” north‐northwesterly relatively “less‐polluted” one. Dust not only delivered large amounts mineral elements but also carried...
On the basis of three mountain sites (Mount Tai, Hua and Huang) newly founded in east‐central China several other from Acid Deposition Monitoring Network east Asia (EANET) WMO World Data Centre for Greenhouse Gases (WDCGG), we investigate seasonal cycle ozone over its budgets by using a regional chemical transport model (NAQPMS). The observations show striking pattern two sharp peaks May‐June September–October at which are higher than those observed Europe North America. Ozone analysis...
Abstract. Organic aerosol (OA) represents a large fraction of submicron aerosols in the megacity Beijing, yet long-term characterization its sources and variations is very limited. Here we present an analysis situ measurements OA submicrometer particles with chemical speciation monitor (ACSM) for 2 years from July 2011 to May 2013. The are analyzed multilinear engine (ME-2) by constraining three primary factors including fossil-fuel-related (FFOA), cooking (COA), biomass burning (BBOA). Two...
Currently, many challenges are faced in simulating ozone(O3), sulfate(SO42-), and nitrate(NO3-) concentrations over East Asia, particularly the overestimation of surface O3 NO3- underestimation SO42- concentration during haze episodes. In this study, we examined radiative heterogeneous chemical effects aerosols by incorporating recently reported mechanisms, including self-amplifying formation, dinitrogen pentoxide (N2O5) hydrolysis, a reaction converting gaseous nitric acid (HNO3) to oxide...
Abstract. The Atmospheric Pollution and Human Health in a Chinese Megacity (APHH-Beijing) programme is an international collaborative project focusing on understanding the sources, processes health effects of air pollution Beijing megacity. APHH-Beijing brings together leading China UK research groups, state-of-the-art infrastructure quality models to work four themes: (1) sources emissions pollutants; (2) atmospheric affecting urban pollution; (3) exposure impacts; (4) interventions...
Abstract Organic aerosol (OA) constituted a large fraction of particles during severe haze episodes in winter northern China, yet our understanding its physical and chemical processing was limited. Here we investigate the sources processes OA four 2016 using high‐resolution mass spectrometer. The PM 2.5 reached 400 μg/m 3 severest episode (Ep1) when Beijing issued red alert implemented strict emission controls. Our results showed that secondary (SOA) dominated on average accounting for...
This paper synthesizes the research findings on stable isotopes (δ2H and δ18O) of water molecular, with respect to applications in tracing natural cycle. A general purpose diagram δ2H versus δ18O may serve as a geo-indicator various circulation processes is involved: hydrological, hydro-meteorological hydro-geochemical. Equations explanations are provided for total 13 lines that illustrated show fractionation changes when experiencing different processes: GMWL; Moisture recycling line;...
Abstract. We conducted the first real-time continuous vertical measurements of particle extinction (bext), gaseous NO2, and black carbon (BC) from ground level to 260 m during two severe winter haze episodes at an urban site in Beijing, China. Our results illustrated four distinct types profiles: (1) uniform distributions (37 % time) with differences less than 5 %, (2) higher values lower altitudes (29 %), (3) (16 (4) significant decreases heights ∼ 100–150 (14 %). Further analysis...
Abstract. Beijing has suffered from heavy local emissions as well regional transport of air pollutants, resulting in severe atmospheric fine-particle (PM2.5) pollution. This study developed a combined method to investigate source types PM2.5 and its regions during winter 2016 Beijing, which include the receptor model (positive matrix factorization, PMF), footprint an quality model. The PMF was performed with high-time-resolution measurements trace elements, water soluble ions, organic carbon...
Ozone source–receptor relationships over East Asia have been quantitatively investigated using a chemical transport model including an on-line tracer-tagged procedure, with particular focus on the source regions of different daily ozone mixing ratios. Comparison observations showed that reproduced surface and tropospheric nitrogen dioxide column densities. Long-range from outside contributed greatest fraction to annual remote regions, Korean peninsula, Japan, reaching 50%–80% total ozone....
Abstract. A severe dust storm event originated from the Gobi Desert in Central and East Asia during 2–7 May 2017. Based on Moderate Resolution Imaging Spectroradiometer (MODIS) satellite products, hourly environmental monitoring measurements Chinese cities Asian meteorological observation stations, numerical simulations, we analysed spatial temporal characteristics of this as well its associated impact Asia-Pacific region. The maximum observed PM10 (particulate matter with an aerodynamic...
Abstract. Satellite observations reveal that China has been leading the global greening trend in past 2 decades. We assessed impact of land cover change as well climate variability on total biogenic volatile organic compound (BVOC) emission from 2001–2016. found is a national-scale increase BVOC emission. The level 2016 could be 11.7 % higher than 2001 because tree fraction and vegetation biomass. On regional scale, 2013–2016 8.6 %–19.3 2001–2004 hotspots including (1) northeastern China,...
Abstract. Volatility plays a key role in affecting mass concentrations and the lifetime of aerosol particles atmosphere, yet our knowledge volatility relatively polluted environment, e.g., north China, remains poor. Here Beijing summer 2017 2018 was measured using thermodenuder (TD) coupled with an Aerodyne high-resolution spectrometer (AMS) soot particle AMS. Our results showed overall similar thermograms for most non-refractory species compared those reported previous studies. However,...