Atmospheric Chemistry and Physics最新文献

{"title":"Ozone downward flux revealed by high-resolution differential absorption lidar over Tibet during stratosphere-troposphere exchange","authors":"Ruichun Dong,Xin Fang,Chengyun Yang,Tao Li","doi":"10.5194/acp-26-13139-2026","DOIUrl":"https://doi.org/10.5194/acp-26-13139-2026","url":null,"abstract":"This study characterizes a prominent ozone intrusion event driven by stratosphere-to-troposphere exchange (STE) that occurred on 18–19 October 2017. The analysis is enabled by high spatiotemporal resolution ozone profile observations from the USTC Ozone Lidar deployed at Yangbajing, Tibet (29° N, 99° E). The high-spatiotemporal-resolution lidar observations resolve a series of short-lived, rapid ozone descent episodes during the STE event. Temperature profiles independently retrieved from the simultaneously measured 387 nm N 2 Raman signal further reveal a close temporal correspondence between these ozone descent episodes and temperature variations in the tropopause region, with temperature gradients exceeding 8 K km −1 for six of the seven identified episodes. Based on Wei's flux diagnostic and a sensitivity test of PV-based dynamical tropopause thresholds, 3 PVU is adopted as the representative threshold for this event. ECMWF Reanalysis v5 (ERA5) is then used to characterize the spatiotemporal evolution of cross-tropopause mass fluxes over 25–28° N, 95–99° E, showing that the ozone variations observed by the lidar were modulated by gravity waves associated with the tropopause fold. In addition, lidar-measured ozone profiles are incorporated into a cross-tropopause ozone flux calculation framework, yielding an instantaneous peak STE ozone flux of about 3–4×10-10 kgs-1m-2, slightly higher than the corresponding ERA5 value, while maintaining strong agreement in overall flux magnitude and temporal evolution throughout the event. These results show that high-resolution vertical ozone observations and Raman-retrieved temperature profiles from the USTC Ozone Lidar, combined with wind field data, enable accurate quantification of STE-related ozone fluxes. This approach facilitates in-depth investigation of coupled atmospheric composition and dynamical processes.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"9 1","pages":"13139-13156"},"PeriodicalIF":6.3,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Subseasonal and spatial variability of biomass burning aerosol radiative properties observed over the Southeast Atlantic during ORACLES 2016–2018","authors":"Logan T. Mitchell,Connor J. Flynn,Kristina Pistone,Samuel E. LeBlanc,K. Sebastian Schmidt,Hong Chen,Paquita Zuidema,Robert Wood,Jens Redemann","doi":"10.5194/acp-26-13083-2026","DOIUrl":"https://doi.org/10.5194/acp-26-13083-2026","url":null,"abstract":"Biomass Burning Aerosols (BBA) are a source of uncertainty in climate simulations over the Southeast Atlantic. Following emission in Southern Africa, the BBA smoke plume overlies a stratocumulus cloud deck, resulting in aerosol-cloud-radiation interactions that are difficult to observe. During 2016–2018, NASA conducted the ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) airborne campaigns to constrain BBA uncertainty, employing 4STAR (Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research) to retrieve aerosol properties. We use all three months of ORACLES 4STAR sky-scans to investigate the subseasonal variability of BBA radiative properties. Changes in Single Scattering Albedo (SSA) indicate increased scattering relative to extinction as the BBA emission season progresses. We attribute this aerosol brightening to changes in composition, rather than aerosol type, as our Absorption Ångström Exponent analysis provides no evidence for Brown Carbon contributions. SSA from our 4STAR sky-scans is compared against a 30 year climatology from 31 Southern African AERONET (AErosol RObotic NETwork) stations, showing consistent changes in aerosol scattering across land and sea. ORACLES in situ SSA is also examined spatially. Our latitudinal analysis indicates that the September decrease in SSA from 4STAR is affected by the southerly sampling of ORACLES 2016 compared to the other campaigns. Westward gradual increases and sharper decreases in SSA are attributed to late-transport aging processes identified by recent studies. These processes start further eastward in October, in conjunction with the southeastward shift in fires. Understanding these subseasonal and spatial changes in BBA radiative properties has implications for aerosol modelling and validation of satellite products.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"28 1","pages":"13083-13102"},"PeriodicalIF":6.3,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced insights into biomass burning aerosols during the 2023 Canadian wildfires from dual-site Raman and fluorescence lidar observations","authors":"Qiaoyun Hu,Philippe Goloub,Igor Veselovskii,Thierry Podvin,Gaël Dubois,Sergey Khaykin,William Boissière,Fabrice Ducos,Mikhail Korenskiy","doi":"10.5194/acp-26-13027-2026","DOIUrl":"https://doi.org/10.5194/acp-26-13027-2026","url":null,"abstract":"Wildfires, as a major source of aerosols, affect air quality and climate at regional and global scales. Fluorescence lidar is a promising technique for characterizing biomass burning aerosols (BBAs) from wildfires, as it detects signals from fluorescent organic compounds in BBAs in addition to elastic and Raman backscatter. However, published fluorescence lidar studies on BBAs remain largely limited to sparse single-site case studies, hindering the development of the technique and a systematic characterization of BBA properties. This study presents dual-site observations of transported BBAs from the exceptional 2023 Canadian wildfires, recorded between May and September at the ATOLL observatory (France) and the GPI site (Russia). ATOLL operates a multi-wavelength Raman lidar with one fluorescence channel at 466 nm; GPI operates a five-channel broadband fluorescence lidar excited at 355 nm. This dual-site dataset combines elastic, depolarization, and fluorescence observations in free troposphere (FT) and upper troposphere–lower stratosphere (UTLS). Compared with FT layers, UTLS layers exhibit higher depolarization, slightly lower lidar ratios, lower Ångström exponents, and a redshift in fluorescence spectral peaks. Cross-site comparisons reveal consistent fluorescence magnitudes and spectral shapes. Depolarization ratio, Ångström exponent, and fluorescence color ratio are moderately correlated with altitude ( r 2 ≈0.61–0.68), although altitude likely acts as an intermediate variable governed by plume injection height, in-layer temperature, and plume origin. Finally, the near-absence of hygroscopic growth at RH of 90 %–100 % challenges the assumption that aged BBAs are typically hygroscopic, suggesting their water uptake properties may be more complex than currently represented in climate models.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"11 1","pages":"13027-13053"},"PeriodicalIF":6.3,"publicationDate":"2026-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detectability of solid particle injections into the stratosphere with satellite solar occultation instruments","authors":"Anna Lange,John Andrew Dykema,Sandro Vattioni,Ulrike Niemeier,Alexei Rozanov,Christian von Savigny","doi":"10.5194/acp-26-13055-2026","DOIUrl":"https://doi.org/10.5194/acp-26-13055-2026","url":null,"abstract":"Stratospheric aerosol injections (SAI) have been proposed as a potential climate intervention to mitigate some effects of global warming. This method involves the idea of injecting sulphur dioxide into the stratosphere. Other ideas include the injection of solid particles, like alumina and calcite, as these particles absorb less terrestrial infrared radiation and scatter solar radiation more efficiently. The aim of the study is to investigate the detectability of the continuous injection of 5 Tg yr −1 of alumina and calcite with typical satellite solar occultation instruments using SOCOL-AERv2 (SOlar Climate Ozone Links-Atmospheric and Environmental Research Incorporation version 2) model simulation results and the SCIATRAN radiative transfer model. Vertically resolved retrievals of the stratospheric aerosol extinction coefficient at 565 nm demonstrate that, under the assumptions made, it is possible to detect the injection of solid particles into the stratosphere and that the corresponding SAI signals can be distinguished from natural variability under near-background conditions, which is essential for the observational verification of potential SAI perturbations.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"15 1","pages":"13055-13067"},"PeriodicalIF":6.3,"publicationDate":"2026-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing halocarbon radiative efficiency estimates by coupling radiative transfer and quantum chemical calculations: impact of updated spectroscopic parameters and low-frequency contributions","authors":"Daniela Alvarado-Jiménez,Nicola Tasinato,Roberto Buizza,Keith P. Shine","doi":"10.5194/acp-26-13069-2026","DOIUrl":"https://doi.org/10.5194/acp-26-13069-2026","url":null,"abstract":"We update a fast method for calculating the global mean radiative efficiency (RE) for weak absorbers (known as the Pinnock Curve). It is then employed to evaluate improved REs, for 30 halocarbons focusing particularly on the low-wavenumber (<500 cm −1 ) contributions where laboratory measurements of absorption cross-sections are scarce. The Pinnock Curve is updated using spectral line parameters from the HITRAN2020 database and the MT_CKD_4.3 water vapor continuum formulation. Halocarbon REs are evaluated by coupling this update with infrared absorption cross section spectra evaluated by means of a quantum chemical protocol featuring a non-empirical inclusion of anharmonic effects in both transition frequencies and intensities and accounting for conformer distributions. Recent revisions to the MT_CKD water vapor continuum coefficients decrease atmospheric opacity, producing a small increase in RE, which is counteracted by updates to line-by-line spectroscopic parameters in HITRAN2020. These compensatory effects result in a small increase in halocarbon REs, with an average rise of ∼0.3  % . Analysis of the low-wavenumber region shows that for the targeted compounds it contributes no more than 5 mW m −2  ppb −1 . On average, it amounts to 0.9 % of the total RE, but reaches about 3 % for HFC-152a and HFC-161. Despite this modest magnitude, accurate treatment of this spectral range is essential, as its impact is molecule-dependent and even small contributions can influence climate metrics. For seven of the 30 gases considered here, the low wavenumber contribution to RE is more than 10 times greater than that calculated in earlier work.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"100 1","pages":"13069-13082"},"PeriodicalIF":6.3,"publicationDate":"2026-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient formation of aqueous secondary organic aerosols from the hydroxyl radical reaction with fenchol, borneol, and menthol","authors":"Priyanka Jain,Bartłomiej Witkowski,Agata Błaziak,Tomasz Gierczak","doi":"10.5194/acp-26-13001-2026","DOIUrl":"https://doi.org/10.5194/acp-26-13001-2026","url":null,"abstract":"Aqueous-phase oxidation of oxygenated monoterpenes likely contributes to the formation of secondary organic aerosol (SOA) from biogenic volatile organic compounds, but quantitative and mechanistic data for such precursors are limited. In this study, the aqueous-phase reactions of three atmospherically relevant terpenoic alcohols (TAs) – fenchol, borneol, and menthol – with hydroxyl radicals (OH) were investigated using a photochemical reactor combined with GC/MS and LC/ToF-MS analyses and kinetic modelling. The objectives were to elucidate reaction mechanisms, identify major products, and quantify yields of aqueous SOA ( aq SOA) under atmospherically relevant conditions. Comprehensive product analysis revealed that oxidation proceeds via H–atom abstraction, yielding a wide range of multifunctional products. In addition to previously reported products, this work first identified low-volatility terpenoic acids formed as higher-generation products, providing new evidence for the formation of low-volatility compounds from aqueous OH reactions with TAs. The molar yields of quantified products approached unity within the estimated uncertainties, which were ca. 30 %, primarily due to the use of surrogate standards. Based on these data, explicit kinetic box models were developed, successfully reproducing the measured temporal evolution of reactants. Modelled aq SOA yields ranged from 10 % to 70 %, depending on liquid water content and reaction progress, representing the first quantitative estimates for the three TAs under investigation. The results demonstrate that aqueous oxidation of semi-volatile terpenoids can efficiently generate low-volatility products contributing to SOA formation. These findings highlight the importance of multiphase processing of oxygenated terpenoids and provide new mechanistic and quantitative data for atmospheric models.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"38 1","pages":"13001-13025"},"PeriodicalIF":6.3,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ice core insights into the morphology and composition of mineral dust deposited in the tropical Peruvian Andes","authors":"Austin M. Weber,Stanislav Kutuzov,Emilie Beaudon,M. Roxana Sierra-Hernández,Mary Davis,Laurel H. Bayless,Don Kenny,Lonnie G. Thompson","doi":"10.5194/acp-26-12887-2026","DOIUrl":"https://doi.org/10.5194/acp-26-12887-2026","url":null,"abstract":"Mineral dust plays an important role in governing Earth's energy balance by scattering electromagnetic radiation back to space and by reducing the surface albedo of glaciers. However, in the tropical Andes of South America, long-term mineral dust observational records are extremely scarce and spatially limited; likewise, little has been done to characterize the morphological and mineralogical properties of dust in this region. Here we present a multidecadal mineral dust record obtained from a tropical ice core with emphasis on the size distributions, shape characteristics, and mineral compositions of single particles. We used a scanning electron microscope with energy dispersive x-ray spectrometry (SEM-EDS) to characterize 1887 individual mineral grains (< 5 µm) preserved in an ice core from Nevado Huascarán (Peru) and we interpret the results in context of dust provenance. The SEM-derived particle sizes are found to follow a lognormal distribution with circularities (median 0.75) and aspect ratios (median 1.42) typical of mineral dust. Approximately 60 % of the mineral particles are consistent with clay mineralogy (e.g., illite, kaolinite, montmorillonite), indicating that the particles originate primarily from soils in distal source areas. The relative abundance of quartz, feldspar, and mica in the ice core is comparatively low and likely reflects local dust derived from granodiorites and phyllites near the glacial margins.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"30 1","pages":"12887-12909"},"PeriodicalIF":6.3,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An advanced modelling study on the role of dimethyl sulfide in new particle formation in the pristine marine boundary layer","authors":"Robin Wollesen de Jonge,Zihao Fu,Pontus Roldin,Michael Boy","doi":"10.5194/acp-26-12865-2026","DOIUrl":"https://doi.org/10.5194/acp-26-12865-2026","url":null,"abstract":"New particle formation (NPF) enhances the concentration of cloud condensation nuclei (CCN) over the oceans, thereby affecting the radiative balance and, consequently, Earth's climate. The literature suggest that marine NPF predominantly occurs in the free troposphere, as the extensive surface area of sea spray aerosols and limited precursor gases suppress NPF in the marine boundary layer (MBL). However, such interpretations do not fully account for the observations on nucleation and Aitken-mode particles within the MBL. Here, we demonstrate how natural emissions of dimethyl sulfide (DMS) and NH 3 can drive H 2 SO 4 –NH 3 -derived NPF in the MBL during cloud-free conditions following precipitation events. The newly formed particles manage to grow into the upper Aitken and accumulation mode size range within 3–4 d, with the potential to act as CCN. Through extensive sensitivity runs, we show that DMS-derived NPF and growth exhibits a non-linear response to variations in air temperature and wind speed, whereas their response to changes in sea surface temperature, precipitation rate, and DMS surface ocean concentration remains approximately linear. Sporadic cloud cover is shown to suppress NPF. Finally, we employ quantum chemical calculations to provide temperature dependant rate coefficients for the OH-initiated oxidation of methane sulphinic acid (MSIA). We also assess other key uncertainties in the DMS oxidation mechanism to illustrate their impact on the formation and growth of DMS-derived aerosol particles in the MBL.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"100 1","pages":"12865-12886"},"PeriodicalIF":6.3,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrological drivers of hydrogen cyanide wildfire emissions from Indonesian peat fires during the 2015, 2019, and 2023 El Niño events","authors":"Antonio G. Bruno,David P. Moore,Jeremy J. Harrison,Ailish Graham,Martyn P. Chipperfield,Corinne Vigouroux","doi":"10.5194/acp-26-12925-2026","DOIUrl":"https://doi.org/10.5194/acp-26-12925-2026","url":null,"abstract":"Indonesian peatlands store vast amounts of carbon that are highly vulnerable to fire during El Niño-driven droughts. When ignited, peat releases large quantities of greenhouse gases and other species with significant environmental impacts, including hydrogen cyanide (HCN), a sensitive tracer of smouldering combustion. In this work, we use new satellite retrievals from the Infrared Atmospheric Sounding Interferometer (IASI) spectra using the University of Leicester IASI retrieval scheme (ULIRS), that we validate against ground-based Fourier transform infrared (FTIR) measurements at Reunion Maido, TOMCAT atmospheric model simulations, hydrological information, and fire activity observations to evaluate the factors driving trace gas emissions during the 2015, 2019, and 2023 El Niño events. The 2015 El Niño produced large burdens of HCN and carbon monoxide (CO), unprecedented in the satellite observational era and driven by exceptionally low soil moisture, depressed groundwater levels, and deep burn depths. In contrast, the 2019 and 2023 events exhibited markedly weaker emissions despite similar Oceanic Niño Index (ONI) anomalies, reflecting more favourable hydrological conditions. Comparisons of the satellite trace gas observations with simulations of the TOMCAT model show that burned-area-based inventories such as the Global Fire Emissions Database (GFED) version 4 substantially overestimate emissions from peat fires in 2015, while a new peat-specific database, FINNpeatSM (Fire Inventory from NCAR (FINNv1.5) New peat with Soil Moisture), better represents fire season timing and burn depth by incorporating soil moisture constraints. From satellite-derived HCN : CO enhancement ratios, we provide new emission factors for HCN that offer benchmarks for new emission inventories. Our results show that peat fire intensity and emissions are driven not only by El Niño strength but also by local hydrological conditions such as soil water content and precipitation. Integrating hydrological indicators with satellite observations of atmospheric composition is therefore critical for improving fire emission inventories.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"164 1","pages":"12925-12952"},"PeriodicalIF":6.3,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of aerosol properties during a huge transatlantic smoke transport event using Aeolus observations in synergy with multi-platform data","authors":"Kangwen Sun,Guangyao Dai,Dimitri Trapon,Holger Baars,Albert Ansmann,Ulla Wandinger,Songhua Wu","doi":"10.5194/acp-26-12953-2026","DOIUrl":"https://doi.org/10.5194/acp-26-12953-2026","url":null,"abstract":"During the wildfire season on the West Coast of the US in September 2020, biomass burning smoke aerosols were continually generated, resulting in several transatlantic transport events. As a high spectral resolution lidar (HSRL), ALADIN could directly retrieve the aerosol extinction and backscatter coefficient. Targeting a large-scale tropospheric smoke transport event originating from the western US on 14 September and arriving over Europe on 21 September, a method for constructing an Aeolus smoke dataset was developed based on ALADIN observations, in synergy with multi-source data. Utilizing selected cross-sections from this dataset, the vertical structure of the smoke layers at different transport stages are presented. HYSPLIT simulations illustrate the general transport pathway connecting these layers. Statistical analyses of the complete Aeolus smoke dataset from 14 to 21 September reveal the evolution of the smoke plume throughout its transatlantic pathway. The dense smoke plume throughout the transport was characterized by mean extinction coefficients of approximately 200 Mm −1 across all selected cross-sections and a decline in AOD from 0.54 to 0.33 along the transport pathway. The smoke layers ascended from approximately 4.4 km above the US to over 6 km above the Europe and were observed above clouds upon reaching Europe. The initially decreasing and then increasing lidar ratios are likely associated with the aging process and the hygroscopic growth of smoke particles, individually. Plume separation was observed over the mid-Atlantic, and the two resulting branches were investigated individually. To our knowledge, this paper presents the first use of ALADIN for observations and analyses of a large-scale transatlantic tropospheric smoke transport. The comprehensive characterization presented herein provides valuable information for advancing global aerosol research.","PeriodicalId":8611,"journal":{"name":"Atmospheric Chemistry and Physics","volume":"28 1","pages":"12953-12976"},"PeriodicalIF":6.3,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149021967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}