Atmospheric Research最新文献

{"title":"Chemistry and sources of atmospheric aerosols deposited in the Central Pyrenees in the period 2016–2023, with a focus on African dust events occurred during cold season","authors":"Javier Bandrés ,&nbsp;Juan Ignacio López-Moreno ,&nbsp;Pedro Salvador ,&nbsp;Jorge Pey","doi":"10.1016/j.atmosres.2025.108686","DOIUrl":"10.1016/j.atmosres.2025.108686","url":null,"abstract":"<div><div>This study specifically investigates the geochemical characterization and the identification of primary sources of atmospheric aerosols deposited in the Ordesa y Monte Perdido National Park (PNOMP, Spanish Pyrenees) from 2016 to 2023. The primary objective is to unravel the sources of these aerosols, analyze their temporal variability, and discern the impact of certain aerosol types, especially African dust, on processes affecting the surrounding cryosphere.</div><div>Methodologically, the study employs robust and established sampling and analysis techniques, including total aerosol deposition monitoring, widely accepted aerosol analysis methods, and the Positive Matrix Factorization (PMF) v5.0 source contribution model, which identifies key aerosol factors and sources, both natural and anthropogenic. Additionally, the study integrates air mass back-trajectories analysis, allowing for the identification of synoptic meteorological conditions associated with African dust intrusions. Between 10,3 and 19,5 % of the sets of back-trajectories computed from three different starting during the 2016–2023 period corresponded to configurations that facilitated the arrival of air masses from North Africa. During this period, the annual average contribution of African dust to total deposition was 12,8 g m⁻² yr⁻¹, accounting for 45 % of the overall input, underscoring the influence of this source compared to other aerosol contributions such as black carbon. These findings highlight the complex interplay between atmospheric transport, aerosol composition, and snowpack dynamics in high-mountain environments. This study ultimately demonstrates the importance of sustained monitoring and cross-disciplinary research to better understand how aerosol deposition on natural systems in combination with ongoing climate change in the Pyrenees and similar alpine systems.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108686"},"PeriodicalIF":4.4,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145730864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Comparisons of SPI and SPEI in capturing drought dynamics: A global assessment across arid and humid regions” [Atmospheric Research, 329(2026), 108475]","authors":"Mustafa Mwinjuma ,&nbsp;Ren Wang ,&nbsp;Msafiri Mtupili ,&nbsp;Mnana Twaha","doi":"10.1016/j.atmosres.2025.108672","DOIUrl":"10.1016/j.atmosres.2025.108672","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108672"},"PeriodicalIF":4.4,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predictability of temperature anomalies in Southeast Europe and the Eastern Mediterranean in June 2024 based on seasonal forecasts of the INM RAS Earth system model","authors":"Vasilisa Bragina ,&nbsp;Evgeny Volodin ,&nbsp;Maria Tarasevich ,&nbsp;Pavel Vargin ,&nbsp;Valentina Khan ,&nbsp;Ksenia Sumerova","doi":"10.1016/j.atmosres.2025.108700","DOIUrl":"10.1016/j.atmosres.2025.108700","url":null,"abstract":"<div><div>In June 2024 extremely hot weather was observed in Southeast Europe and the Eastern Mediterranean. Based on ensemble seasonal forecasts of the INM RAS Earth system model (INMCM6M), that is run operationally at the Hydrometeorological Research Center of Russia for monthly calculation of global seasonal forecasts, the prediction of tropospheric temperature anomalies in this region is studied. Obtained results show that, among the causes of this heatwave, the most important role was played by the reduced accumulation of soil moisture during the preceding months and the reduced cooling of the lower troposphere due to evaporation stress. The analysis of observational data indicates the increased (especially in the first half of June 2024) meridional transport of warm air masses along the western edge of the heatwave region towards the central Volga region and the north-east of European Russia (north-westward of Ural Mountains). Model experiments allow to conclude, that the meridional transport of air masses from the warmer region to the north, rather than particularly extreme warming in the Eastern Mediterranean, led to the formation of a region of positive temperature anomalies in the north-east of European Russia.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108700"},"PeriodicalIF":4.4,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145730863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term retrieval and analysis of aerosol components and optical properties in Tianjin, China: Insights from GRASP/component approach and sun-photometer observations (2014–2024)","authors":"Xindan Zhang ,&nbsp;Lei Li ,&nbsp;Yu Zheng ,&nbsp;Jibiao Zhu ,&nbsp;Tiantao Cheng ,&nbsp;Ke Gui ,&nbsp;Yuanxin Liang ,&nbsp;Shuhui Liu ,&nbsp;Haoling Zhang ,&nbsp;Jingrui Ma ,&nbsp;Huizheng Che ,&nbsp;Xiaoye Zhang","doi":"10.1016/j.atmosres.2025.108695","DOIUrl":"10.1016/j.atmosres.2025.108695","url":null,"abstract":"<div><div>This study employs the GRASP/Component approach (GRASP: Generalized Retrieval of Atmosphere and Surface Properties) to simultaneously retrieve aerosol optical properties and chemical components from ground-based sun photometer observations in Tianjin during the period 2014–2024. Component-derived aerosol optical depth (AOD) showed very good agreement with ground-based sun photometer measurements (R² ≈ 1; RMSE ≤0.01), confirming the reliability of the inversion algorithm. Correlation analysis between aerosol components and optical properties reveal that fine-mode aerosols are the primary drivers of AOD variability. Black carbon (BC) dominates aerosol absorption across all wavelengths, while brown carbon (BrC) and absorbing dust (CAI) exhibit significant absorption only at shorter wavelengths. Aerosol components present distinct seasonal patterns: BC peaks in winter; CAI and scattering dust (CNAI) increase obviously in spring, consistent with frequent dust transport; fine-mode soluble salts (FNAS) and water content (FAWC) rise in summer due to enhanced photochemical activity and high humidity, whereas their coarse-mode counterparts decline due to wet scavenging. Fine-mode aerosol components in Tianjin have decreased significantly, which is driven by policy interventions. In contrast, coarse-mode components show greater variability, likely regulated primarily by natural processes. Furthermore, columnar BC concentrations and dust concentrations show strong temporal coherence with near-surface PM_2.5 and PM₁₀, respectively, further validating the applicability of the GRASP/Component approach for long-term monitoring of regional aerosol loading and chemical components.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108695"},"PeriodicalIF":4.4,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observations of a dryline interacting with a back-building mesoscale convective system in the Kalahari region of southern Africa","authors":"Lynette van Schalkwyk ,&nbsp;Ross C. Blamey ,&nbsp;Callum Munday ,&nbsp;Richard Washington ,&nbsp;Chris J.C. Reason","doi":"10.1016/j.atmosres.2025.108694","DOIUrl":"10.1016/j.atmosres.2025.108694","url":null,"abstract":"<div><div>A unique set of observations allows the analysis of the environment in which a back-building mesoscale convective system (MCS) developed along a dryline in the semi-arid southern Kalahari region of southern Africa during 28 and 29 December 2023. This MCS resulted in widespread rainfall, roughly equivalent to the December–February average, causing localized flooding and power failures. MCS development occurred along a dryline in a highly unstable, but weakly sheared environment. Near surface moisture gradients exceeded 6 g kg⁻¹ 100 km⁻¹ in places on the dryline during morning and evening of 28 December but were weaker that afternoon. CAPE values exceeded 1000 J.kg⁻¹ shortly after sunrise within the first 100 km of the moist side of the dryline and MU-CAPE exceeded 3000 J kg⁻¹ at 08:00 and 12:00 UTC. Convection started adjacent to the dryline and once individual storm cells merged to form a MCS, new cells continued to develop along the dryline before being steered downstream by mid-level northwesterly winds. Back-building and a strong northeasterly low-level inflow contributed to renewed development along the storm's axis during the night-time, extending its lifespan to at least 13 h. These findings provide new insights into the contribution of MCSs to seasonal rainfall for the southern Kalahari region and a valuable example of mesoscale interactions between a dryline and individual storm cells at night.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"333 ","pages":"Article 108694"},"PeriodicalIF":4.4,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating changes in precipitation event characteristics with projected temperature increase in the 21st century","authors":"Zbyněk Sokol ,&nbsp;Daniela Řezáčová ,&nbsp;Jana Popová","doi":"10.1016/j.atmosres.2025.108698","DOIUrl":"10.1016/j.atmosres.2025.108698","url":null,"abstract":"<div><div>This study investigates how the duration and four calculated characteristics of precipitation events change in relation to the supposed increase in ground temperature during the 21st century in the warm part of the year. We analysed measured hourly precipitation totals at 97 stations in the Czech Republic during 1998–2014, hourly precipitation totals from a reanalysis for the period 1990–2014, and projected precipitation totals for the period 2026–2100 for two future climate scenarios (SSP5–4.5 and SSP5–8.5, which represents “middle of the road” and very strong impact of CO₂ concentrations on climate, respectively).</div><div>We defined a precipitation event (PE) as continuous sequence of hourly precipitation values with a threshold of at least 0.2 mm/h and a duration from 1 to 23 h. The ALADIN-CZ numerical weather prediction model was used to calculate reanalysed PE, while the ALADIN-CLIMAT-CZ climate regional model was used to calculate projected PE for 25 years long periods (2026–2050, 2051–2075 and 2076–2100). The two models are very similar and differ in the input data only. Both models belong to the so-called convection permitting models. A unique feature of the models is their high horizontal resolution of 2.3 km.</div><div>We studied the four characteristics of PE in dependence on duration and ground temperature: (i) the relative frequency of PE; (ii) relative total precipitation of PE; (iii) relative mean precipitation of PE, and (iv) relative maximum precipitation of PE.</div><div>We found that some characteristics of observed PE clearly differ from reanalysed data, while others are very similar. The main difference is that the reanalysed data give longer PE for higher temperature, where the measured data do not indicate any PE. In contrast, the reanalysed and projected PE show consistent results. The main result of the study is that the duration of PE does not exhibit any change with increasing temperature.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108698"},"PeriodicalIF":4.4,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid quantification of bacterial aerosol abundance and influencing factors in high altitude regions based on optimized flow cytometry","authors":"Guannan Mao ,&nbsp;Yongqin Liu ,&nbsp;Xi Wu ,&nbsp;Wenjie Wu","doi":"10.1016/j.atmosres.2025.108696","DOIUrl":"10.1016/j.atmosres.2025.108696","url":null,"abstract":"<div><div>Airborne microorganisms are integral components of the atmosphere, influencing air quality, climate processes, and bacterial dispersal across ecosystems. Their ecological and health implications are particularly pronounced in high-altitude environments, where bacteria are exposed to extreme conditions such as intense ultraviolet (UV) radiation, desiccation, and low temperatures. However, the lack of rapid and accurate detection methods limits our ability to monitor and understand airborne bacterial dynamics in these regions. This study establishes an optimized protocol for quantifying airborne bacteria collected on air filters using flow cytometry (FCM), with a particular focus on applications in high-altitude environments. The method was refined through orthogonal experiments to determine optimal conditions for cell detachment and dispersion. Key steps include fixation with glutaraldehyde, dispersal using Tween 80 and sodium pyrophosphate, combined with 20 min of ultrasonic treatment, and elution with PBS buffer. This optimized protocol was applied to assess spatial and temporal variations in airborne bacterial abundance across three high-altitude regions: urban, lake, and glacier. The results showed that the airborne bacterial concentration was the highest in urban areas (3.3 × 10⁴ cells/m³), followed by lakes (1.0 × 10⁴ cells/m³) and glaciers (7.7 × 10³ cells/m³). The temporal variation of bacterial concentration in urban areas peaked in July and reached a trough in September. Model analysis indicated that PM10 was the main factor regulating bacterial concentration in urban air, while organic matter particles dominated in natural environments. The protocol developed in this study provides a rapid, reliable, and field-applicable tool for monitoring airborne bacterial abundance in high-altitude regions, offering valuable insights into atmospheric bacterial ecology and its environmental determinants.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108696"},"PeriodicalIF":4.4,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145730870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and temporal variation of raindrop size distribution in Great Britain","authors":"Shan Jiang ,&nbsp;Dawei Han ,&nbsp;Rafael Rosolem ,&nbsp;Merhala Thurai ,&nbsp;Miguel A. Rico-Ramirez","doi":"10.1016/j.atmosres.2025.108699","DOIUrl":"10.1016/j.atmosres.2025.108699","url":null,"abstract":"<div><div>Raindrop size distributions (DSDs) play a key role in revealing the underlying physical processes of rainfall. This study investigates the characteristics of the DSDs in Great Britain (GB) using data collected from eleven Thies laser precipitation monitors (LPMs) between 2017 and 2019. Around one million one-minute raindrop samples were fitted to a normalized gamma drop distribution model. This study examines the DSD characteristics from both temporal (seasons) and spatial (geography and topography) perspectives, considering different rain types (stratiform and convective) and rain rate clusters. The results indicate that the average mass-weighted mean diameter <span><math><mfenced><msub><mi>D</mi><mi>m</mi></msub></mfenced></math></span> and the average normalized intercept parameter <span><math><msub><mi>log</mi><mn>10</mn></msub><mfenced><msub><mi>N</mi><mi>w</mi></msub></mfenced></math></span> are influenced by geographical and atmospheric conditions. The <span><math><mfenced><msub><mi>D</mi><mi>m</mi></msub></mfenced></math></span> tends to be lower and <span><math><msub><mi>log</mi><mn>10</mn></msub><mfenced><msub><mi>N</mi><mi>w</mi></msub></mfenced></math></span> is higher in the western and hilly regions, with the opposite pattern observed over the eastern plain of GB. Both parameters are strongly correlated with rain rate. Compared to subtropical/tropical regions, stratiform rain in GB exhibits smaller <span><math><mfenced><msub><mi>D</mi><mi>m</mi></msub></mfenced></math></span> and larger <span><math><msub><mi>log</mi><mn>10</mn></msub><mfenced><msub><mi>N</mi><mi>w</mi></msub></mfenced></math></span>, while the characteristics of convective rain align with the maritime-like cluster. Significant differences in <span><math><mfenced><msub><mi>D</mi><mi>m</mi></msub></mfenced></math></span> are observed between stratiform (0.78–1.00 mm) and convective (1.30–1.74 mm) rain, with both showing a significant negative linear correlation with <span><math><msub><mi>log</mi><mn>10</mn></msub><mfenced><msub><mi>N</mi><mi>w</mi></msub></mfenced></math></span>. Moreover, extreme convective events show distinct seasonality, with larger <span><math><msub><mi>D</mi><mi>m</mi></msub></math></span> and lower <span><math><msub><mi>log</mi><mn>10</mn></msub><mfenced><msub><mi>N</mi><mi>w</mi></msub></mfenced></math></span> during the warm season. Furthermore, a bimodal distribution is observed for <span><math><msub><mi>log</mi><mn>10</mn></msub><mfenced><msub><mi>N</mi><mi>w</mi></msub></mfenced></math></span> in light rain events over western and hilly regions, highlighting the complexity of microphysical processes associated with small raindrops. The characteristics of DSDs observed in this study provide valuable insights for future investigations into GB's precipitation formation and quantitative precipitation estimation using weather radar.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108699"},"PeriodicalIF":4.4,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145730869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating the full-day planetary boundary layer height from lidar, AMDAR, and radiosonde observations over Beijing, China","authors":"Jieyu Hou ,&nbsp;Mengyao Li ,&nbsp;Guicai Ning ,&nbsp;Tianwen Wei ,&nbsp;Jinlong Yuan ,&nbsp;Haiyun Xia","doi":"10.1016/j.atmosres.2025.108701","DOIUrl":"10.1016/j.atmosres.2025.108701","url":null,"abstract":"<div><div>The planetary boundary layer (PBL) is the core transition zone for mass, energy, and momentum exchanges between surface and free atmosphere, significantly modulating weather, climate and human activities. However, full-day evolutions of PBL structure and PBL height (PBLH) remain limited as insufficient atmospheric vertical observations. Here, we comprehensively evaluate PBL features and PBLH detected from radiosonde, AMDAR, and lidar over Beijing, China. The PBL detections from the three platforms are significantly consistent, confirming their collective efficacy in full-day PBL monitoring. Notably, some outlies with obvious discrepancies in PBLH detection among these three platforms are extracted and their underlying causes are revealed. Then, these outliers are removed and the consistency in PBLH detected from the three platforms markedly improved. The correlation coefficient (R) and the root mean square error (RMSE) in PBLH detected from radiosonde and AMDAR range from 0.44 to 0.64 and 207.02 m to 264.85 m, respectively. PBLH detected from radiosonde (AMDAR) and lidar under stable (convective) and neutral thermal conditions significantly correlates at R ranging from 0.53 (0.67) to 0.67 (0.73) and RMSE from 218.77 m (324.77 m) to 304.23 m (386.57 m). Moreover, PBLH detections from all three platforms consistently show that convective PBLH &gt; neutral PBLH &gt; stable PBLH. These results highlight the reliability of aircrafts' and lidar's observations in detecting PBLH and PBL thermal structures. Finally, PBL detections from the three platforms are integrated to monitor full-day PBL, compensating for the radiosonde's limitation in monitoring convective boundary layer.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"332 ","pages":"Article 108701"},"PeriodicalIF":4.4,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145730871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Summertime characteristics and in-situ photochemistry of volatile organic compounds in a high-altitude region in central China: Implications of regional transport","authors":"Zhaoqi Wang ,&nbsp;Chunmian Yang ,&nbsp;Haibin Huang ,&nbsp;Mengjie Deng ,&nbsp;Jiapeng Ran ,&nbsp;Xiaoxiao Li ,&nbsp;Xiaofen Pei ,&nbsp;Han Yue ,&nbsp;Hairong Cheng","doi":"10.1016/j.atmosres.2025.108692","DOIUrl":"10.1016/j.atmosres.2025.108692","url":null,"abstract":"<div><div>The chemical characteristics and photochemistry of volatile organic compounds (VOCs) were investigated at Shennongjia (SNJ), a high-altitude site in central China, from July to August 2023. The mean mixing ratio of total VOCs (TVOCs) was 14.61 ± 1.64 ppbv, dominated by alkanes (35.4 %) and carbonyls (29.4 %). The northeastern air mass exhibited the highest VOC concentration (16.33 ± 7.62 ppbv), followed by the southeastern air mass (10.45 ± 3.25 ppbv). Analysis of potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) identified central/eastern Hubei and the Sichuan Basin as major source regions for VOCs at SNJ. An observation-based photochemical box model was employed to examine VOC photochemistry and in-situ O₃ formation. Extremely low nitric oxide (NO) mixing ratios led to incomplete HOx cycling, and VOCs actively participated in the generation of free radicals. In-situ O₃ formation was governed by regionally transported air masses with distinct VOC compositions. Northwestern air masses, characterized by high temperature, high carbonyls, and low relative humidity (RH) despite lower TVOCs (8.10 ± 1.29 ppbv), yielded the highest net O₃ production rate (1.27 ± 0.33 ppbv/h), with formaldehyde photolysis contributing 13.3 % to hydroperoxyl radical (HO₂) generation. Conversely, the southeastern air masses, despite carrying the highest TVOC load, inhibited O₃ formation due to elevated RH. Formaldehyde and isoprene dominated photochemical reactivity. Our results highlight that VOC speciation, especially reactive carbonyls and biogenic VOCs, critically controls radical cycling and O₃ dynamics in remote regions.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"331 ","pages":"Article 108692"},"PeriodicalIF":4.4,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145730874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}