A5101627062- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Aeolian processes and effects
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Precipitation Measurement and Analysis
- Air Quality Monitoring and Forecasting
- Toxic Organic Pollutants Impact
- Soil Moisture and Remote Sensing
- Thermochemical Biomass Conversion Processes
- Energy and Environment Impacts
Jilin Weather Modification Office
2018-2025
State Key Joint Laboratory of Environment Simulation and Pollution Control
2010-2022
Beijing Institute of Water
2018-2022
Tsinghua University
2014-2022
China Huadian Corporation (China)
2022
China Meteorological Administration
2005-2022
Beijing Meteorological Bureau
2018
Rice University
2010-2015
Peking University
2010-2011
Abstract A regional haze with daily PM 2.5 (fine particulate matters diameters less than µm) exceeding 500 µg/m 3 lasted for several days in January 2013 over North China, offering an opportunity to evaluate models. Observations show that inorganic aerosols (sulfate, nitrate, and ammonium) are the largest contributor during period, while sulfate shows enhancement ratio of 5.4 from clean period. The nested‐grid GEOS‐Chem model reproduces distribution simulates up 364 maximum . Yet on average,...
In January 2013, a severe regional haze occurred over the North China Plain. An online-coupled meteorology-chemistry model was employed to simulate impacts of aerosol–meteorology interactions on fine particles (PM2.5) pollution during this episode. The response PM2.5 meteorology change constituted feedback loop whereby planetary boundary layer (PBL) dynamics amplified initial perturbation PM2.5. High concentrations caused decrease surface solar radiation. maximal in daily average radiation...
Abstract. High concentration of fine particles (PM2.5), the primary concern about air quality in China, is believed to closely relate China's large consumption coal. In order quantitatively identify contributions coal combustion different sectors ambient PM2. 5, we developed an emission inventory for year 2013 using up-to-date information on energy and controls, conducted standard sensitivity simulations chemical transport model GEOS-Chem. According simulation, contributes 22 µg m−3 (40 %)...
This study reports on the emission characteristics of NH3 from coal and biomass combustion in household stoves. The average factors (EFs) for burning 13 four briquette samples a traditional heating stove were 1.01 0.95 mg/g, respectively, whereas EF cooking was 0.96 mg/g. These EFs did not present significant differences well-correlated with tested fuel properties. However, modified efficiency (MCE) appeared to be measured various fuel–stove combinations. For same samples, advanced high MCE...
The size-resolved properties of atmospheric black carbon (BC) importantly determine its absorption capacity and cloud condensation nuclei (CCN) ability. This study reports comprehensive vertical profiles BC size-related over the Beijing area (BJ) Continental Europe (CE). mass loadings CE were in range clean background BJ. For both planetary boundary layer (PBL) lower free troposphere, median core diameter BJ during cold season was 0.21 ± 0.02 μm, larger than warm (0.18 0.01 μm), which may...
Abstract. In this study, the Community Multiscale Air Quality (CMAQ) modeling system is used to simulate ozone (O3) episodes during Program of Regional Integrated Experiments over Pearl River Delta, China, in October 2004 (PRIDE-PRD2004). The simulation suggests that O3 pollution a regional phenomenon Delta (PRD). Elevated levels often occurred southwestern inland PRD, estuary (PRE), and southern coastal areas 1-month field campaign. Three evolution patterns simulated surface are summarized...
In the absence of particulate matter (PM) control devices, residential coal combustion contributes significantly to ambient PM pollution. Characterizing emissions from with high time resolution is beneficial for developing policies and evaluating environmental impact PM. This study reports evolution submicrometer organic aerosols (OA) during a complete process, that is, fire start extinction. Three commonly used types (bituminous, anthracite, semicoke coals) were evaluated in typical stove...
Abstract. During the APEC (Asia-Pacific Economic Cooperation) Leaders' 2014 Summit in Beijing, strict regional air emission controls were implemented, providing a unique opportunity to investigate transport and formation mechanism of fine particulate matter (PM2.5). This study explores use vertical observation methods influence on PM2.5 pollution Beijing before during Summit. Vertical profiles extinction coefficient, wind, temperature relative humidity monitored at rural site border Hebei...
Abstract. Aerosol liquid water (ALW) is ubiquitous in ambient aerosol and plays an important role the formation of both organics inorganics. To investigate interactions between ALW during haze evolution, was modelled based on long-term measurement submicron composition different seasons Beijing. contributed by inorganics (ALWinorg) ISORROPIA II, (ALWorg) estimated with κ-Köhler theory, where real-time hygroscopicity parameter (κorg) calculated from organic oxygen-to-carbon ratio (O∕C)....
Abstract Warm rain prevails in clean marine clouds and is one of the most abundant types precipitation world. However, warm rarely observed urban polluted atmospheric environments due to high number concentrations aerosols generally suppress occurrence rain. Three aircraft observation were used during summer Beijing area. Here, we documented processes similar shallow (Beijing) environment after cleansing air pollution by extensive on 11 September 2019. Our results showed that, compared with...
Abstract. Airborne measurements from two Texas Air Quality Study (TexAQS) field campaigns have been used to investigate changes of ozone production in Houston, Texas, 2000 2006, a period major emission reduction measures for petrochemical and other sources. Simultaneous declines nitrogen oxides (NOx = NO + NO2) highly reactive volatile organic compounds (HRVOCs) were observed between the periods. We simulate HOx (OH HO2) radicals with box model, Dynamically Simple Model Atmospheric Chemical...
Black carbon (BC) has adverse impacts on human health and significantly influences the global climate as one of major atmospheric heating contributors. These effects strongly depend microphysical properties BC. BC particles their distributions are mostly monitored studied by online refractory instruments, which account for with aerodynamic diameters <1 μm. During a field campaign conducted in beginning season Beijing, coarse (aerodynamic diameter >1 μm) were found to take up high mass...
Abstract. During the second Texas Air Quality Study 2006 (TexAQS II), a full range of pollutants was measured by aircraft in eastern during successive transects power plant plumes (PPPs). A regional photochemical model is applied to simulate physical and chemical evolution plumes. The observations reveal that SO2 NOy were rapidly removed from PPPs on cloudy day but not cloud-free days, indicating efficient aqueous processing these compounds clouds. reasonably represents observed NOx...
Abstract The fast development of a secondary aerosol layer was observed over megacities in eastern Asia during summertime. Within three hours, from midday to early afternoon, the contribution aerosols above planetary boundary (PBL) increased by factor five, and coatings on black carbon (BC) also enhanced its absorption efficiency 50%. This tended result intensive actinic flux received PBL which promoted photochemical reactions. BC could be further amplified strong reflection solar radiation...
Abstract. Inverse modeling of nitrogen oxide (NOx) emissions using satellite-based NO2 observations has become more prevalent in recent years, but rarely been applied to regulatory at regional scales. In this study, OMI satellite column densities are used conduct inverse NOx emission inventories for two Texas State Implementation Plan (SIP) episodes. Addition lightning, aircraft, and soil the inventory narrowed did not close gap between modeled satellite-observed over rural regions....
Abstract Whether the cloud condensation nuclei (CCN) ability of aerosol could be predicted by compositions has been long debated. Measurements submicron and size‐resolved CCN activation fraction were conducted at a mountain site (1,344 m) near Beijing region during wintertime. The is influenced in noon‐afternoon ground anthropogenic sources through convective mixing (CM) for certain period received aged pollutants regional advection (RA). By comparing measured CCN‐derived hygroscopicity...