A5051451022- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Soil and Water Nutrient Dynamics
- Wastewater Treatment and Nitrogen Removal
- Odor and Emission Control Technologies
- Atmospheric Ozone and Climate
- Marine and coastal ecosystems
- Carbon Dioxide Capture Technologies
- Natural Language Processing Techniques
- Climate Change and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Topic Modeling
- Plant responses to elevated CO2
- Vehicle emissions and performance
- Advanced Text Analysis Techniques
- COVID-19 impact on air quality
Peking University
2021-2025
Massachusetts Institute of Technology
2025
Excess reactive nitrogen (Nr), including oxides (NOx) and ammonia (NH3), contributes strongly to fine particulate matter (PM2.5) air pollution in Europe, posing challenges public health. Designing cost-effective Nr control roadmaps for PM2.5 mitigation requires considering both efficiencies implementation costs. Here we identify optimal pathways Europe by integrating emission estimations, quality modeling, exposure-mortality experiments cost data. We find that phasing out emissions would...
Recent Chinese air pollution actions have significantly lowered the levels of fine particulate matter (PM2.5) in North China via controlling emissions sulfur dioxide (SO2) and nitrogen oxides (NOx) together with primary aerosols, while another precursor, ammonia (NH3), not yet been regulated. This raises a question that how effective NH3 emission controls can be on mitigation PM2.5 along reduction SO2 NOx emissions. Here we use regional quality model to investigate this issue focusing for...
Substantial forestation-induced greening has occurred over South China, affecting the terrestrial carbon storage and atmospheric chemistry. However, these effects have not been systematically quantified due to complex biosphere-atmosphere interactions. Here we integrate satellite observations, forestry statistics, an improved chemistry model investigate impacts of forestation on both ozone air quality. We find that alleviates surface via enhanced dry deposition suppressed turbulence mixing,...
Nitrogen is an essential nutrient and a major limiting element for the ocean ecosystem. Since preindustrial era, substantial amounts of nitrogen from terrestrial sources have entered via rivers, groundwater, atmospheric deposition. China serves as key hub in global cycle, but pathways, sources, potential mitigation strategies land-ocean transport are unclear. By combining CHANS, WRF-Chem, WNF models, we estimated that 8 million tonnes (Tg) was transferred into 2017 China, with deposition...
Abstract While China’s clean air actions implemented since 2013 have been effective in mitigating PM 2.5 pollution, the large emission reductions during COVID-19 lockdown period early 2020 did not similarly alleviate pollution North China, reflecting a distinct nonlinear chemical response of formation to changes. Here we apply emission-concentration relationships for diagnosed using adjoint approach quantitatively assess how nonlinearity affects over Beijing February two reduction scenarios:...
Recent developments in large language models (LLMs) have led to significant improvements intelligent dialogue systems'ability handle complex inquiries. However, current LLMs still exhibit limitations specialized domain knowledge, particularly technical fields such as agriculture. To address this problem, we propose ShizishanGPT, an question answering system for agriculture based on the Retrieval Augmented Generation (RAG) framework and agent architecture. ShizishanGPT consists of five key...
Ammonia emissions in China mainly came from agricultural activities. Excess could lead to degraded air quality and excess nitrogen deposition. Therefore, it is essential improve air deposition through ammonia reduction measures. On the basis of existing research, this study established an Agricultural Management Technology-Ammonia emission assessment platform with 51 measures fertilizer application 53 livestock farming derived a...
While great efforts have been made to China’s clean air actions since 2013 and effectively mitigated PM2.5 pollution, the emission-concentration relationships cost-effectiveness may changed substantially are poorly constrained. Large emission reductions during COVID-19 lockdown period in early 2020 did not similarly alleviate pollution North China, reflecting a distinct nonlinear chemical response of formation changes. At same time, strengthened emissions standards elimination...
Abstract Atmospheric ammonia (NH3) has multiple impacts on the environment, climate change and human health. China is largest emitter of NH3 globally, with dynamic inventory emission remaining uncertain. Here, we use high-resolution secondary national pollution survey, integrated satellite data, 15N isotope source apportionment models to better understand those key features emissions its in China. Our results show that total were estimated be 12.3 Tg yr-1 2017 three peaks April, June...
Dry deposition is a major sink of ozone in the planetary boundary layer (PBL). In this study, we investigate how different PBL parameterizations influence simulations surface and its dry fluxes over eastern China using Weather Research Forecasting Model coupled to Chemistry (WRF-Chem), quantify contributions change rates with an integrated process (IPR) analysis method. As exacerbated pollution urban areas has aroused extensive concern, limit our discussion model results for three main city...
Dry deposition is an important ozone sink in the planetary boundary layer (PBL), but how it affects levels has not been systematically quantified. Here we investigate influences of PBL mixing parameterizations on surface and dry eastern China using a regional air quality model (WRF-Chem) further quantify contributions to tendencies both near with integrated process rates (IPR) analysis. We analyze three schemes coupled their corresponding (SFL) schemes, including Yonsei University (YSU),...
Abstract Atmospheric ammonia (NH3) has multiple impacts on the environment, climate change and human health. China is largest emitter of NH3 globally, with dynamic inventory emission remaining uncertain. Here, we use high-resolution secondary national pollution survey, integrated satellite data, 15N isotope source apportionment models to better understand those key features emissions its in China. Our results show that total were estimated be 12.3 Tg yr-1 2017 three peaks April, June...
<p>Large amounts of energy consumption in recent years have not only increased air pollution and greenhouse gas emissions, but also released more anthropogenic heat into the atmosphere. However, latter was overlooked previous quality pollution-related health impacts studies. Here we use atmospheric chemistry model coupled exposure mortality to investigate effects flux on PM<sub>2.5</sub> related burden China. We find ignoring leads nighttime...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Geophysical Research Letters. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Narrowing in differences of urban non-urban surface ozone levels summers Northern HemisphereAuthorsHanHaniDLinZhangZehuiLiuXuYueLeiShuYuanghangZhangSee all authors Han...