Journal of Environmental Sciences, Год журнала: 2023, Номер 148, С. 665 - 682
Опубликована: Окт. 13, 2023
Язык: Английский
Environmental Science & Technology, Год журнала: 2021, Номер 56(1), С. 175 - 184
Опубликована: Дек. 13, 2021
Biogenic volatile organic compound (BVOC) emissions have long been known to play vital roles in modulating the formation of ozone and secondary aerosols (SOAs). While early studies evaluated their impact globally or regionally, BVOC emitted from urban green spaces (denoted as U-BVOC emissions) largely ignored primarily due failure low-resolution land cover resolving such processes, but also because important contribution BVOCs was previously unrecognized. In this study, by utilizing a recently released high-resolution dataset, we develop first set emission inventories U-BVOCs China at spatial resolutions high 1 km. This new dataset resolved densely distributed core areas. The megacities could account for large fraction total emissions, good agreement interannual variations between concentrations over certain regions stresses potentially crucial role influencing variations. newly constructed inventory is expected provide an improved enable research community re-examine modulation on ozone, SOA, atmospheric chemistry environments.
Язык: Английский
Процитировано
80
Environmental Research Letters, Год журнала: 2022, Номер 17(3), С. 034020 - 034020
Опубликована: Фев. 14, 2022
Abstract Ozone (O 3 ) is one of the most critical pollutants affecting air quality in China recent years. In this study, different impacts El Niño–Southern Oscillation (ENSO) warm/cold phases on summertime tropospheric O over are examined based model simulations, ground measurements, and reanalysis data. Summertime surface concentrations show a positive correlation with ENSO index during years 1990–2019, largest increases by 20% southern Niño (warm phase) relative to La Niña (cold The modulation extends middle even upper troposphere. Our analysis indicates that flux convergence associated weakened southerlies primary reason for increase China. addition, mainly from domestic emissions This study highlights potential significance modulating China, great implications pollution mitigation.
Язык: Английский
Процитировано
54
Advances in Atmospheric Sciences, Год журнала: 2023, Номер 40(8), С. 1339 - 1361
Опубликована: Апрель 28, 2023
Atmospheric chemistry research has been growing rapidly in China the last 25 years since concept of "air pollution complex" was first proposed by Professor Xiaoyan TANG 1997. For papers published 2021 on air (only included Web Science Core Collection database were considered), more than 24 000 authored or co-authored scientists working China. In this paper, we review a limited number representative and significant studies atmospheric few years, including (1) sources emission inventories, (2) chemical processes, (3) interactions with meteorology, weather climate, (4) between biosphere atmosphere, (5) data assimilation. The intention not to provide complete all progress made but rather serve as starting point for learning about advances reviewed paper have enabled theoretical framework complex be established, provided robust scientific support highly successful control policies China, created great opportunities education, training, career development many graduate students young scientists. This further highlights that developing low-income countries are heavily affected can benefit from these advances, whilst at same time acknowledging challenges still remain hopefully addressed over next decades.
Язык: Английский
Процитировано
39
Journal of Advances in Modeling Earth Systems, Год журнала: 2025, Номер 17(3)
Опубликована: Март 1, 2025
Abstract The overestimation of surface ozone concentration in low‐resolution global atmospheric chemistry and climate models has been a long‐standing issue. We first update the dry deposition scheme both high‐ (0.25°) (1°) Community Earth System Model (CESM) version 1.3 runs, by adding effects leaf area index correcting sunlit shaded fractions stomatal resistances. With this update, 5‐year‐long summer simulations (2015–2019) using CESM still exhibit substantial (by 6.0–16.2 ppbv) over U.S., Europe, eastern China, pollution hotspots. is further improved adjusting cuticle conductance, reducing mean bias 19%, increasing model resolution reduces 43%. elucidate mechanism which grid spacing influences simulated ozone, revealing distinctive pathways urban versus rural areas. In areas, mainly affects daytime levels, where additional NO x emissions from nearby areas result an boost simulations. contrast, follows similar due to influence volatile organic compounds surrounding However, nighttime closely linked weakened titration owing redistribution Additionally, stratosphere‐troposphere exchange may also contribute high‐resolution simulations, warranting investigation. This optimized enhance understanding formation mechanisms, sources, changes warming climate.
Язык: Английский
Процитировано
2
Environmental Pollution, Год журнала: 2022, Номер 318, С. 120886 - 120886
Опубликована: Дек. 19, 2022
Язык: Английский
Процитировано
32
Environmental Pollution, Год журнала: 2023, Номер 326, С. 121508 - 121508
Опубликована: Март 24, 2023
Язык: Английский
Процитировано
22
Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(7), С. 4247 - 4269
Опубликована: Апрель 6, 2023
Abstract. China has been conducting a series of actions on air quality improvement for the past decades, and pollutant emissions have changing swiftly across country. Provinces are an important administrative unit management in China; thus reliable provincial-level emission inventory multiple years is essential detecting varying sources pollution evaluating effectiveness controls. In this study, we selected Jiangsu, one most developed provinces China, high-resolution nine species 2015–2019, with improved methodologies different sectors, best available facility-level information individual sources, real-world measurements. Resulting from implementation strict control measures, anthropogenic were estimated to declined 53 %, 20 7 2 10 21 16 6 18 % sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO), non-methane volatile organic compounds (NMVOCs), ammonia (NH3), inhalable particulate matter (PM10), fine (PM2.5), black (BC), (OC) 2015 2019, respectively. Larger abatement SO2, NOx, PM2.5 was detected more region southern Jiangsu. During period 2016 ratio biogenic (BVOCs) (AVOCs) exceeded 50 month July, indicating importance summer O3 formation. Our estimates annual NMVOCs, NH3 generally smaller than national inventory, MEIC (the Multi-resolution Emission Inventory China), but larger primary particles. The discrepancies between studies resulted mainly methods estimation (e.g., procedure-based approach AVOC key industries used work) inconsistent source operation penetration removal efficiencies devices). Regarding periods, reduction SO2 found 2017 AVOCs, 2019. Among 13 major ultra-low-emission retrofit power sector contributor reduced NOx (accounting 38 43 abatement, respectively) 2015–2017, its effect became very limited afterwards as had commonly completed by 2017. Instead, extensive coal-fired boilers upgrade renovation non-electrical industry measures 2017–2019, accounting collectively 61 49 57 PM2.5, Controls industrial sectors effective two while relating other (transportation solvent replacement) become recent years. provincial demonstrated support modeling Through scenario setting modeling, worsened meteorological conditions 2019 alleviation. However, efforts controls identified largely overcome negative influence variation. changed contribute 4.3 5.5 µg m−3 concentration 2015–2017 While elevated 4.9 led 3.1 partly (not fully though) offsetting meteorology-driven growth. analysis justified validity local provided scientific basis formulate prevention policies regions worldwide.
Язык: Английский
Процитировано
18
Environmental Chemistry Letters, Год журнала: 2024, Номер unknown
Опубликована: Окт. 4, 2024
Язык: Английский
Процитировано
8
Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(1), С. 397 - 425
Опубликована: Янв. 11, 2024
Abstract. Rural-to-urban transformation (RUT) is the process of turning a rural or natural land surface into an urban one, which brings about important modifications in surface, causing well-known effects like heat island (UHI), reduced wind speeds, and increased boundary layer heights. Moreover, with concentrated human activities, RUT introduces new emission sources greatly perturb local regional air pollution. Particulate matter (PM) one key pollutants responsible for deterioration quality still major issue European cities, frequent exceedances limit values. Here we introduce chemistry–climate model (regional climate RegCM coupled offline to chemistry transport CAMx) study quantifies how modified PM concentrations over central Europe including underlying controlling mechanisms that contribute final Apart from two most studied ones, (i) emissions (ii) canopy meteorological forcing (UCMF; i.e. impact conditions on quality), also analyse less contributors RUT's quality: (iii) dry-deposition velocities (DVs) due urbanized use (iv) biogenic urbanization-induced vegetation changes affect these emissions. To calculate magnitude each contributors, perform cascade simulations, whereby contributor added by reference state, while focus given PM2.5 (particulate diameter then 2.5 µm). Its primary secondary components, namely elemental carbon (PEC), sulfates (PSO4), nitrates (PNO3), ammonium (PNH4), organic aerosol (SOA), are analysed too. The validation using measurements showed systematic negative bias total PM2.5, probably caused underestimated partly carbon. For nitrates, underestimation limited warm season, winter, tends overestimate their concentrations. However, case, annual cycle reasonably captured. We evaluated sample 19 cities found urbanization 2–3 1–1.5 µg m−3 winter summer, respectively. This mainly driven alone slightly higher (1.5–3.5 1.2–2 summer), effect UCMF was decrease at 0.2–0.5 (in both seasons), controlled enhanced vertical eddy diffusion, increases were modelled areas. increase around 30 %–50 %, resulted 0.1–0.25 seasons. Finally, summer 0.1 m−3, negligible. components be (values indicate averages) 0.4 0.3 PEC, 0.05 0.02 PSO4, 0.08 PNO3, 0.04 0.03 PNH4, 0 SOA. main emissions, usually larger than fact counteracted decrease. component, DV clear concentration, finally, impacted SOA predominantly, decrease, very small inorganic too (they increased). In summary, when analysing pollution, apart forcing, has consider its dry deposition. These shown our calculations they act predominantly through modifications, only turned out during summer.
Язык: Английский
Процитировано
7
Forests, Год журнала: 2024, Номер 15(3), С. 508 - 508
Опубликована: Март 8, 2024
Ground-level ozone (O3) pollution has been a severe environmental and health problem for decades. The importance of biogenic volatile organic compounds (BVOCs) in the formation tropospheric photochemistry O3 highlighted, especially areas rapid urbanization. We conducted simultaneous measurements trace gases, including NO, NOX, O3, BVOCs (i.e., isoprene α-pinene), urban rural forest Beijing to determine relationships between them. results highlight differences terms ambient air concentrations interrelationships BVOCs, were quantified. Moreover, concentration was found be higher atmosphere site than site, which had α-pinene concentrations. NOX at there significant exponential relationship indicating that impact NOx on greater site. increased with rising both sites. In case substantially BVOC concentrations, declining strongly promote O3. Consideration should given planting tree species low-BVOC emissions, as they are crucial mitigating areas. Additionally, considered policymaking related control.
Язык: Английский
Процитировано
7