Atmospheric Environment最新文献

{"title":"Influence of rainfall and non-rainfall factors on the estimation of below-cloud scavenging coefficient across different particle modes in the subtropical urban atmosphere of South China","authors":"Linhai Xiao ,&nbsp;Danli Zhang ,&nbsp;Bangkai Hu ,&nbsp;Jun Tao ,&nbsp;Jiawei Li ,&nbsp;Zhen Zhou ,&nbsp;Boguang Wang","doi":"10.1016/j.atmosenv.2025.121395","DOIUrl":"10.1016/j.atmosenv.2025.121395","url":null,"abstract":"<div><div>A comprehensive field campaign was conducted during the wet season of 2019 in urban Dongguan, South China, to investigate the evolution of particle number concentrations during rainfall events. Size-resolved particle number concentrations (4.7–10,000 nm), classified into nucleation mode (NUC), Aitken mode (AIT), accumulation mode (ACC), and coarse mode (CM), were measured to estimate below-cloud scavenging (BCS) coefficients (estimated Λ) from 53 rainfall events by comparing particle number concentrations before and during rainfall for each event. Among these, 36 % (19 events) exhibited positive estimated Λ values across all modes, 19 % (10 events) showed negative values, and 45 % (24 events) displayed mixed positive/negative values. Estimated Λ values for CM particles were consistent with theoretical estimates, while those for NUC, AIT, and ACC particles were approximately an order of magnitude higher. During the 19 rainfall events with positive estimated Λ values, a weak positive correlation was observed between rainfall intensity (RI) and the average estimated Λ across all modes, while stronger correlations emerged during rainfall events coinciding with new particle formation (NPF), where RI and estimated Λ were highly correlated (<em>R</em>² = 0.93, <em>p</em> &lt; 0.05). In these cases, estimated Λ for NUC, AIT, and ACC particles were at least 1.7 times those in other rainfall events. This enhancement is largely attributed to rainfall interfering with concurrent NPF processes, which reduces the formation and growth of new particles and amplifies the decline in particle number concentrations. As a result, Λ values derived from observational data may be inflated, independent of actual wet scavenging. Additional non-rainfall factors, such as air mass transport and local emissions, also contributed to the variability. These findings underscore that non-rainfall influences, by altering ambient particle concentrations, can significantly bias Λ estimation and offer new insights into interpreting apparent BCS behavior.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121395"},"PeriodicalIF":4.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental impact of three distinct combustion products released from domestic heating installations operating on wood and non-wood pellets","authors":"Tadeusz Magiera ,&nbsp;Pasi Heikkilä ,&nbsp;Sari Lukkari ,&nbsp;Michał S. Bućko ,&nbsp;Maria M. Szuszkiewicz","doi":"10.1016/j.atmosenv.2025.121393","DOIUrl":"10.1016/j.atmosenv.2025.121393","url":null,"abstract":"<div><div>Wood pellets have become a popular alternative to fossil fuels and are widely applied in many countries. On the EU market, the prices of high-quality wood pellets have increased dramatically due to the energy crisis resulting from the Russian-Ukrainian War. Cheaper alternatives include pelletized agro-biomass (e.g. cereal straw, miscanthus or sunflower husk). The aim of this study was to compare the chemical and mineralogical composition of three different solid combustion products—bottom ash, coarse dust, and fine dust fractions—generated during combustion of various biomass pellet types in standard domestic heating systems. The combustion of different biomass pellets was carried out in a low-power heating boiler. Distinct differences in inorganic elemental composition and mineralogy were observed between wood and non-wood biomass pellets. Significant differences were also noted between the fine dust fraction collected in the exhaust gas duct and the coarser combustion products. The latter ones were characterized by a predominance of Ca, primarily in the form of carbonates and sulfates. In contrast, the solid combustion products of straw, sunflower husks, and miscanthus contained potassium as the main component, accounting for 30–50 % of the composition. The fine dust from coniferous wood pellets was significantly enriched in potentially toxic metals such as Zn, Cu, Pb, and Cd, which could pose a serious threat to air quality in residential areas. The most promising combustion product was the fine dust obtained from sunflower husks, since it contained the highest amounts of K and P, while maintaining relatively low concentrations of heavy metals.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121393"},"PeriodicalIF":4.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical profiling of residential wood combustion aerosols over Tirana, Albania: First lidar-based observations","authors":"Gladiola Malollari ,&nbsp;Albert Ansmann ,&nbsp;Alexandra Chudnovsky ,&nbsp;Holger Baars ,&nbsp;Ronny Engelmann ,&nbsp;Dietrich Althausen ,&nbsp;Birgit Heese ,&nbsp;Seit Shallari","doi":"10.1016/j.atmosenv.2025.121358","DOIUrl":"10.1016/j.atmosenv.2025.121358","url":null,"abstract":"<div><div>Residential wood combustion is a major contributor to wintertime air pollution, releasing high concentrations of fine particulate matter and altering aerosol optical properties. Understanding the optical characteristics of wood-burning aerosols is crucial for improving air quality monitoring and refining atmospheric models. In this study, we examined the aerosol optical characteristics in Tirana, Albania, using Polly lidar observations at 532 nm during 2022–2023. For the first time, a lidar campaign was conducted in Albania, enabling long-term profiling of aerosol optical properties up to the tropopause. Our results indicate a dominant contribution of residential wood burning to winter air pollution by measuring exceptionally high extinction-to-backscatter ratios (lidar ratios) within the planetary boundary layer. Significant contributions from controlled biomass burning were identified in winter, with lidar ratios around 100 ± 20 sr measured predominantly in December and January. We analyzed lidar ratios during winter and spring and retrieved intensive and extensive optical properties for selected cases. Lidar-derived particle mass concentration of the emissions ranged from 20–80 <span><math><mi>μ</mi></math></span>g m⁻³ in the lowermost heavily polluted smoke layer with a vertical depth of usually 200 to 300 m. The smoke-related AOD, measured with Polly at 532 nm, was typically between 0.05 and 0.1 in the 1200–1700 m deep boundary layer during the main winter months. To provide a regional perspective, lidar ratios and aerosol optical depth (AOD) data from the AERONET (AErosol RObotic NETwork) and 1 km MODIS (Moderate Resolution Imaging Spectroradiometer) were included in the analyses. HYSPLIT back-trajectory analysis of three contrasting cases revealed diverse air mass pathways and aerosol transport mechanisms affecting Tirana. These results enhance understanding of aerosol dynamics in urban and regional environments.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121358"},"PeriodicalIF":4.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mobile measurements of atmospheric isoprene across subtropical forests in Southern China","authors":"Haifeng Yu ,&nbsp;Xiangcheng Wu ,&nbsp;Lin Cheng ,&nbsp;Wen Tan ,&nbsp;Liang Zhu ,&nbsp;Yunhua Chang","doi":"10.1016/j.atmosenv.2025.121378","DOIUrl":"10.1016/j.atmosenv.2025.121378","url":null,"abstract":"<div><div>Isoprene, primarily emitted by terrestrial plants, is the most abundant non-methane volatile organic compound (NMVOC) in the atmosphere, playing a critical role in regulating tropospheric ozone levels and contributing to the formation of secondary organic aerosols. However, ground-based observations that capture large-scale spatial patterns of forest isoprene emissions across extensive regions remain limited. Here using the Vocus mobile laboratory, we conducted mobile measurements of isoprene along a east-west transect (∼2000 km) across the subtropical forest region of China. The results show significant spatial heterogeneity in isoprene concentrations, with an average concentration of 209.4 ± 66.7 pptv. In particular, the isoprene concentration in the Guizhou forests (primarily coniferous) was 155.6 ± 51.0 pptv, approximately 24.7 % lower than the 206.7 ± 37.7 pptv observed in the Jiangnan forests (dominated by subtropical evergreen broadleaf forests with widespread bamboo). This suggests that vegetation type significantly influences the intensity of forest isoprene emissions. Interestingly, in the highly industrialized Zhejiang region, the isoprene concentration (289.7 ± 51.0 pptv) was 46.3 % and 28.7 % higher than those in the Guizhou and Jiangnan forests, respectively. This indicates that anthropogenic emissions are likely a significant contributor to the elevated isoprene concentrations in the region. Therefore, in regions with significant human activities, it is essential to consider the influence of anthropogenic emissions on isoprene in addition to natural sources.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121378"},"PeriodicalIF":4.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating daily NOx and CO2 emissions in typical megacities of east China using TROPOMI NO2 observations","authors":"Yizhen Jia ,&nbsp;Minghui Tao ,&nbsp;Hongming Zhang ,&nbsp;Pengfei Ma ,&nbsp;Bin Zhao ,&nbsp;Rong Li ,&nbsp;Dejia Yin ,&nbsp;Lijuan Zhang ,&nbsp;Haijun Huang ,&nbsp;Lunche Wang ,&nbsp;Yi Wang ,&nbsp;Liangfu Chen","doi":"10.1016/j.atmosenv.2025.121377","DOIUrl":"10.1016/j.atmosenv.2025.121377","url":null,"abstract":"<div><div>Accurate and dynamic estimates of anthropogenic emissions are crucial for developing and evaluating emission reduction measures. In this study, an improved superposition column model based on TROPOspheric Monitoring Instrument (TROPOMI) nitrogen dioxide (NO₂) vertical column density is used to estimate the chemical lifetime of nitrogen oxides (NO_x) and daily NO_x and carbon dioxide (CO₂) emissions in typical megacities of China. The average NO_x lifetimes are: Beijing 5.02 ± 1.71 h, Zhengzhou 3.89 ± 1.4 h, Wuhan 2.09 ± 0.69 h, Shanghai 2.45 ± 0.83 h. The estimated NO_x and CO₂ emissions agree well with these of bottom-up emission inventories. Despite a steady decline in NO_x emissions of all the four megacities owing to emission control measures during 2019–2021, CO₂ emissions increase in Beijing and Zhengzhou. The daily variations of NO_x and CO₂ emissions can clearly capture the sudden decline of NO_x and CO₂ emissions during COVID-19 lockdowns. Furthermore, the main sources of NO_x and CO₂ shifted from industry to transportation and from industry to power respectively with the rapid emission reduction of different sectors. The distinct CO₂-to-NO_x ratios across sectors in the four megacities impact the speed of NO_x and CO₂ emission reduction and emphasize the necessity of coordinated emission reduction of NO_x and CO₂ emissions. In addition, emission amounts between weekdays and weekends exhibit very different variations in these megacities. Considering the dramatic changes of the NO_x and CO₂ emissions, it's necessary to conduct a regular estimation of anthropogenic emissions from the major sources.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121377"},"PeriodicalIF":4.2,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vehicle emission ratios of HCN and HONO measured near a highway in Meridian, Idaho","authors":"Andrew J. Lindsay,&nbsp;Kyle Banecker,&nbsp;Brigitte M. Weesner,&nbsp;Ezra C. Wood","doi":"10.1016/j.atmosenv.2025.121379","DOIUrl":"10.1016/j.atmosenv.2025.121379","url":null,"abstract":"<div><div>Much effort is spent by the air pollution and atmospheric science communities on quantifying pollutant emissions as they are used as inputs in air quality models and assist in the interpretation of atmospheric measurements at field sites. Nitrogen oxides (“NOx”, defined as the sum of nitric oxide NO and nitrogen dioxide NO₂), nitrous acid (HONO), and hydrogen cyanide (HCN) are all byproducts of combustion processes. While NOx emissions from on-road vehicles have been extensively studied, vehicle emissions of HONO and especially HCN are not as well quantified. Enhancing our knowledge of direct HCN and HONO emissions is essential because HONO is an important precursor to the hydroxyl radical (OH), thereby playing a critical role in atmospheric oxidation, and HCN is toxic, long-lived in the atmosphere, and used as a tracer for biomass burning. In this manuscript, we present measurements of HCN and HONO made using an iodide-adduct chemical ionization mass spectrometer (CIMS) during August of 2019 near a highway in Meridian, Idaho. Vehicle emission ratios of HCN and HONO with respect to NOx (i.e., ΔHCN/ΔNOx and ΔHONO/ΔNOx) are reported as well as emission ratios of HCN and NOx with respect to carbon monoxide (CO) (i.e., ΔHCN/ΔCO and ΔNOx/ΔCO). Observed emission ratios were quite variable and determined for select highway influenced periods during the nighttime and early morning (prior to sunrise) located typically 200–500 s downwind of the major interstate highway. We report average values of 5.3 and 1.13 ppbv ppmv⁻¹ for ΔHCN/ΔNOx and ΔHCN/ΔCO, respectively. The average ΔHONO/ΔNOx value - 9.8 ppbv ppmv⁻¹ - falls within the range of reported literature values though it is somewhat higher than the commonly used value of 8 ppbv ppmv⁻¹.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121379"},"PeriodicalIF":4.2,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive evaluation of emission control strategies on anthropogenic VOCs and ozone reduction during the 31st summer Universiade in Chengdu","authors":"Zhihan Rao ,&nbsp;Miao Feng ,&nbsp;Qinwen Tan ,&nbsp;Qiang Feng ,&nbsp;Wei Zhang ,&nbsp;Pan Cao ,&nbsp;Dongyang Chen ,&nbsp;Jianjun Li ,&nbsp;Li Zhou ,&nbsp;Fumo Yang","doi":"10.1016/j.atmosenv.2025.121380","DOIUrl":"10.1016/j.atmosenv.2025.121380","url":null,"abstract":"<div><div>The 31st Summer Edition of the FISU World University Games took place in Chengdu, Sichuan Province, China from July 27^nd to August 8th, 2023. To ensure optimal air quality during this event, a series of control measures were implemented, providing a unique opportunity to assess the impact of reduced anthropogenic volatile organic compound (VOC) emissions on ozone (O₃) mitigation. A comprehensive field campaign was conducted at an urban supersite in Chengdu, spanning both the pre-control period (July 1st −21st) and the control period (July 22nd-August 8th). To reflect the emission features of primary pollutants, the photochemical initial concentrations of VOCs (In-VOCs) were calculated and their sources were identified by applying receptor model. During the control period, the average mixing ratio of In-VOCs (comprising 57 species) was 22.7 ppbv, reflecting a 17 % reduction compared to the pre-control period. Source apportionment identified four key anthropogenic VOC sources: industrial emissions, vehicle exhaust, gasoline evaporation, and solvent use. The largest reduction was observed in solvent utilization (48.9 %). The observation-based box model, configured with the Master Chemical Mechanism (MCM-OBM), was used to quantify the impact of VOC reductions from each source on O₃ concentrations. The most significant reduction in daily maximum 8-h O₃ concentrations was achieved by controlling traffic sources (vehicle and gasoline evaporation emissions), resulting in a decrease of 11.9 μg/m³, followed by reductions from industrial emissions (8.9 μg/m³) and solvent utilization (2.4 μg/m³). Our results indicate that a modest, scientifically justified reduction in VOC levels can significantly contribute to O₃ pollution mitigation, providing valuable insights for summer urban air quality management.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121380"},"PeriodicalIF":4.2,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatially comprehensive estimation of hourly PM2.5 concentration in a cloud-covered basin based on remote sensing and meteorological models","authors":"Xiang Dai ,&nbsp;Jiamin Wang ,&nbsp;Changhang Wu ,&nbsp;Chao Wan ,&nbsp;Zhihong Liu ,&nbsp;Yuanhang Li ,&nbsp;Fangqiang Ye ,&nbsp;Yang Zhang","doi":"10.1016/j.atmosenv.2025.121374","DOIUrl":"10.1016/j.atmosenv.2025.121374","url":null,"abstract":"<div><div>The Sichuan Basin is one of the regions in China with severe PM_2.5 pollution issues. However, the extensive cloud cover in the area makes it difficult for traditional satellite remote sensing methods to achieve spatiotemporally continuous PM_2.5 monitoring. To accurately obtain spatiotemporally continuous PM_2.5 monitoring results in the Sichuan Basin, this study proposes two machine learning models: the ERA5-driven Long Short-Term Memory model (ERA5-LSTM) and the WRF-driven Long Short-Term Memory model (WRF-LSTM). By combining high spatial resolution remote sensing emission factors (including satellite-derived aerosol, nighttime light data, vegetation index, land-use types, and impervious surface fraction) with meteorological model data, hourly PM_2.5 mass concentration estimates at 1 km spatial resolution over the Sichuan Basin were obtained while maintaining the same level of accuracy as ChinaHighAirPollutants (CHAP) daily scale data. Validation against ground observations indicated that: (1) The WRF-LSTM model (R² = 0.82, RMSE = 15.75 μg/m³) outperformed the ERA5-LSTM model (R² = 0.81, RMSE = 16.51 μg/m³). (2) The resolution of meteorological data significantly influenced the model's feature extraction capability. The WRF-LSTM model, compared to the ERA5-LSTM model, can exhibit more details of PM_2.5 spatial distribution. (3) For monitoring PM_2.5 pollution events, the WRF-LSTM model also exhibits superior performance compared to the ERA5-LSTM model, with R² values of 0.90 versus 0.85 between the estimated results and ground observations.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121374"},"PeriodicalIF":4.2,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal variation and source apportionment of ultrafine particles near brussels airport (Belgium)","authors":"Meritxell Garcia-Marlès ,&nbsp;Jan Peters ,&nbsp;Jo Van Laer ,&nbsp;Evelien Frijns ,&nbsp;Patrick Berghmans ,&nbsp;Jeroen Staelens ,&nbsp;Jelle Hofman ,&nbsp;Thierri de Vos ,&nbsp;Olivier Brasseur ,&nbsp;Martine Van Poppel ,&nbsp;Andrés Alastuey ,&nbsp;Xavier Querol","doi":"10.1016/j.atmosenv.2025.121375","DOIUrl":"10.1016/j.atmosenv.2025.121375","url":null,"abstract":"<div><div>Ultrafine particle (UFP) emissions from aircraft engines are associated with increased UFP concentrations near airports, raising concerns for air quality and public health. This study investigated the impact of airport operations at Brussels Airport (Belgium) on local air quality during a two-month monitoring campaign in autumn 2015. Four monitoring sites, strategically located from the airport and along a transect parallel to the main runway, were used to measure particle number size distributions (PNSD), black carbon (BC), particulate matter (PM₁₀), and nitrogen oxides (NOx). This novel approach, using high-resolution PNSD data, provided a detailed analysis of aircraft-related UFPs under varying meteorological conditions and operational phases. Results showed strong correlations between UFP concentrations, meteorological conditions, and aircraft landing and takeoff (LTO) operations, with the smallest measured particles (10–20 nm) dominating the particle number concentrations (PNC) near the airport, contributing up to 65 % of total PNC. Aircraft emissions were responsible for 15000–20000 # cm⁻³ of 10–20 nm particles near the airport, with peak concentrations (30-min) reaching 65000–80000 # cm⁻³ during high-activity periods. While airport-related UFP concentrations decreased with distance, they persisted up to 7 km. Source apportionment analysis identified taxiing and takeoff as major contributors to UFPs near the airport (50–64 % of PNC), with road traffic, biomass burning, and regional background more significant at greater distances. Despite attempts to distinguish between landing and takeoff emissions, similar particle profiles were observed for both operations. These findings provide insight into the spatial persistence, dominant operational phases, and size distribution of aircraft-related UFP emissions, and underscore the need for targeted mitigation strategies to improve air quality near airports.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121375"},"PeriodicalIF":4.2,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and evaluation of photolysis and gas-phase reaction scheme in EPICC-model: Impacts on tropospheric ozone simulation","authors":"Wending Wang ,&nbsp;Huansheng Chen ,&nbsp;Zifa Wang ,&nbsp;Jie Li ,&nbsp;Xueshun Chen ,&nbsp;Fenfen Yu ,&nbsp;Xiaohan Fan ,&nbsp;Shuman Zhao ,&nbsp;Bo Hu ,&nbsp;Wei Wang ,&nbsp;Xiao Tang ,&nbsp;Zhe Wang ,&nbsp;Baozhu Ge ,&nbsp;Jianbin Wu","doi":"10.1016/j.atmosenv.2025.121373","DOIUrl":"10.1016/j.atmosenv.2025.121373","url":null,"abstract":"<div><div>Photolysis and gas-phase reaction schemes (PHS and GRS, respectively) are two modules that significantly influence the modeling performance of tropospheric ozone in chemical transport models (CTMs). Quantifying the impacts of updating both PHS and GRS on simulated ozone has significant implications for effectively improving the modeling performance of CTMs, which has not been previously studied. In this study, based on the architecture of multi-option scientific modules in the Emission and atmospheric Processes Integrated and Coupled Community (EPICC)-Model, two PHSs (a highly parameterized approach (EXPR) and a streamlined version of the TUV model (STUV)) and two GRSs (CBMZ and CB6r5) were developed to assess their impacts on simulated tropospheric ozone concentrations in the North China Plain during winter and summer. Compared to the cbmzEXPR scheme, the cb6r5STUV scheme showed a significant improvement in ozone simulation performance in both winter and summer, with the normalized mean bias of the maximum daily 8-h average ozone improving from −0.24 to −0.10 in winter and from 0.11 to −0.01 in summer. These improvements were attributed to better representation of photolysis rates by STUV, along with a more detailed description of gas-phase reactions by CB6r5 with distinct seasonal effects. In winter, updates of the GRS dominated the total improvement, with a contribution of 2.29 ppb (91 %) to daytime ozone changes. In summer, updates of the PHS played a dominant role, contributing −6.58 ppb (66 %) to daytime ozone changes. This study highlights the importance of simultaneously updating the PHS and GRS in CTMs to achieve better ozone simulation performance.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"359 ","pages":"Article 121373"},"PeriodicalIF":4.2,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144511011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}