Magmatic Storage and Volatile Fluxes of the 2021 La Palma Eruption

Geochemistry Geophysics Geosystems, Год журнала: 2024, Номер 25(6)

Опубликована: Июнь 1, 2024

Abstract The 2021 La Palma eruption (Tajogaite) was unprecedented in magnitude, duration, and degree of monitoring compared to historical volcanism on Palma. Here, we provide data melt inclusions samples from the beginning end compare utility both fluid as recorders magma storage. We also investigated compositional heterogeneities within magmatic plumbing system. found two populations olivine crystals: a low Mg# (78–82) population present at eruption, recording maximum volatile contents (2.5 wt % H 2 O, 1,800 ppm F, 700 Cl, 3,800 S) higher (83–86) sampled toward with lower contents. Despite their host composition, share same range CO concentrations (1.2–1.4 %), indicating growth inclusion capture similar depths. Overall, record pressures (450–850 MPa, ∼15–30 km), when hosted crystal are indistinguishable error. At these mantle pressures, is expected be an exsolved phase explaining between samples, but other species (F, behave incompatibly, thus, increase can explained by fractional crystallization prior eruption. Finally, based our new data, estimates total emission

Язык: Английский

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A review on vulnerable atmospheric aerosol nanoparticles: Sources, impact on the health, ecosystem and management strategies

Journal of Environmental Management, Год журнала: 2024, Номер 365, С. 121644 - 121644

Опубликована: Июль 3, 2024

Язык: Английский

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Impact of a multiple oversampling technique-based assessment framework on shallow rockburst prediction models

Frontiers in Earth Science, Год журнала: 2025, Номер 12

Опубликована: Янв. 20, 2025

The occurrence of class-imbalanced datasets is a frequent observation in natural science research, emphasizing the paramount importance effectively harnessing them to construct highly accurate models for rockburst prediction. Initially, genuine incidents within burial depth 500 m were sourced from literature, revealing small dataset imbalance issue. Utilizing various mainstream oversampling techniques, was expanded generate six new datasets, subsequently subjected 12 classifiers across 84 classification processes. model incorporating highest-scoring original and top two dataset, yielded high-performance model. Findings indicate that KMeansSMOTE technique exhibits most substantial enhancement combined classifiers, whereas individual favor ET+SVMSMOTE RF+SMOTENC. Following multiple rounds hyper parameter adjustment via random cross-validation, combination attained highest accuracy rate 93.75%, surpassing Moreover, SVMSMOTE technique, augmenting samples with fewer categories, demonstrated notable benefits mitigating overfitting, enhancing generalization, improving Recall F1 score RF classifiers. Validated its high generalization performance, accuracy, reliability. This process also provides an efficient framework development.

Язык: Английский

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Analysis of the long-range transport of the volcanic plume from the 2021 Tajogaite/Cumbre Vieja eruption to Europe using TROPOMI and ground-based measurements

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(2), С. 1253 - 1272

Опубликована: Янв. 29, 2025

Abstract. The eruptions of the Tajogaite volcano on western flank Cumbre Vieja ridge island La Palma between September and December 2021 released large amounts ash SO2. Transport dispersion volcanic emissions were monitored by ground-based stations satellite instruments alike. In particular, spectrometric fluorescence Raman lidar for atmospheric moisture sensing (RAMSES) at Lindenberg Meteorological Observatory measured plume strongest eruption 22–23 over northeastern Germany 4 d later. This study provides an analysis SO2 vertical column density (VCD) layer height (LH) measurements obtained with Sentinel-5 Precursor/TROPOspheric Monitoring Instrument (TROPOMI), which are compared to observations several across Canary Islands. Furthermore, a new modeling approach based TROPOMI VCD Hybrid Single-Particle Lagrangian Integrated Trajectory Model (HYSPLIT) was developed, confirmed link measurements. Modeled mean emission vent is in excellent agreement co-located LH local ash-height Finally, comprehensive discussion RAMSES presented. A retrieval has been developed estimate microphysical properties aerosol. For first time, optical particle model utilized that assumes irregular, non-spheroidal shape aerosol particles. According analysis, consisted solely fine-mode inorganic, solid, irregularly shaped particles – presence or wildfire aerosols could be excluded. likely had isometric slightly plate-like effective half maximum dimension around 0.1 µm refractive index about 1.51. Moreover, mass values 70 110 mg m−2, concentrations 45–70 µg m−3, conversion factors 0.21 0.33 g m−2 355 nm retrieved. Possibly observed, least part, secondary sulfate aerosol, produced gas-phase homogeneous reactions during transport air masses from Lindenberg.

Язык: Английский

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Mysterious air pollution in south China linked to volcanic emissions from the Philippines

Communications Earth & Environment, Год журнала: 2025, Номер 6(1)

Опубликована: Фев. 5, 2025

Язык: Английский

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Forecasting the evolution of the 2021 Tajogaite eruption, La Palma, with TROPOMI/PlumeTraj-derived SO2 emission rates

Bulletin of Volcanology, Год журнала: 2025, Номер 87(3)

Опубликована: Фев. 26, 2025

Abstract As global populations grow, the exposure of communities and infrastructure to volcanic hazards increases every year. Once a eruption begins, it becomes critical for risk managers understand likely evolution duration activity assess its impact on infrastructure. Here, we report an exponential decay in satellite-derived SO 2 emission rates during 2021 Tajogaite, La Palma, Canary Islands, show that this pattern allows reliable consistent forecast emissions after first third total duration. The ended when fluxes dropped less than 6% their fitted maximum value, providing useful benchmark compare with other eruptions. Using 1-D numerical magma ascent model, suggest exponentially decreasing trend was primarily produced by reducing chamber pressure as emptied feeding reservoir. This work highlights key role data can play forecasting eruptions how use models inform driving mechanisms controlling eruption.

Язык: Английский

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Compact dual-wavelength depolarization lidar for aerosol characterization over the subtropical North Atlantic

Atmospheric measurement techniques, Год журнала: 2025, Номер 18(8), С. 1885 - 1908

Опубликована: Апрель 25, 2025

Abstract. We present a comprehensive characterization of the optical properties various aerosol types based on data collected using compact dual-wavelength depolarization elastic lidar (532 and 808 nm, CIMEL CE376). This study evaluates vertical distribution temporal evolution aerosols observed in subtropical North Atlantic region, covering Saharan dust, volcanic aerosols, fresh aged wildfire plumes. Measurements were conducted between August 2021 2023, modified two-wavelength Klett inversion method to derive backscatter extinction coefficients from CE376 measurements. To assess performance system, an intercomparison campaign with MPL-4B (MPLNET) was conducted, both systems collocated at Izaña Atmospheric Research Centre (Canary Islands, Spain). Both instruments depicted structure similarly. Discrepancies primarily attributed errors determining overlap function calibration each instrument, as well greater influence solar background radiation system during daylight. The absolute difference volume ratio (δv) 0.003, which decreased 0.002 when only nighttime analyzed. combination two channels provided valuable insights into particle linear (δP), Ångström exponent (EAE (532/808)) attenuated color (ACR (808/532)). Fresh dust particles, characterized by large, non-spherical morphology well-mixed layer, exhibited lowest EAE (532/808), highest ACR (808/532) δP (532) >0.15. In contrast, smaller particles quasi-homogeneous sulfate early stages Cumbre Vieja volcano eruption Canadian plumes traveling across Atlantic. These showed (0.03 for 0.08 aerosols) (532/808) (1.5 1.2, respectively). Intermediate values these retrieved parameters associated heterogenous mixture ash, soot charred vegetation local forest wildfires. underscore suitability micro-lidar continuous monitoring atmospheric aerosols.

Язык: Английский

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Fresh volcanic aerosols injected in the atmosphere during the volcano eruptive activity at the Cumbre Vieja area (La Palma, Canary Islands): Temporal evolution and vertical impact

Atmospheric Environment, Год журнала: 2023, Номер 300, С. 119667 - 119667

Опубликована: Фев. 18, 2023

Язык: Английский

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Health impact of the Tajogaite volcano eruption in La Palma population (ISVOLCAN study): rationale, design, and preliminary results from the first 1002 participants

Environmental Health, Год журнала: 2024, Номер 23(1)

Опубликована: Фев. 13, 2024

Abstract Background The eruption of the Tajogaite volcano began on island La Palma September 19, 2021, lasting for 85 days. This study aims to present design and methodology ISVOLCAN (Health Impact Population due Volcanic Eruption) cohort, as well preliminary findings from first 1002 enrolled participants. Methods A prospective cohort was conducted with random selection adult participants general population, an estimated sample size 2600 individuals. results 857 are presented, along a group 145 voluntary who served interveners during eruption. Data epidemiology exposure were collected, underwent physical examinations, including anthropometry, blood pressure measurement, spirometry, venous extraction toxicological assessment. Results In population ( n = 857), descriptive analysis revealed that mostly middle-aged individuals (50.8 ± 16.4), predominance females. Before eruption, resided at median distance 6.7 km in Western region 10.9 Eastern region. Approximately 15.4% required evacuation, whose 34.8% returning their homes average after 3 months. significant number reported engaging daily tasks involving cleaning volcanic ash both indoors outdoors. most acute symptoms included ocular irritation, insomnia, mood disorders (anxiety-depression), respiratory symptoms. Multivariate show western had higher likelihood lower tract (OR 1.99; 95% CI:1.33–2.99), depression anxiety 1.95; CI:1.30–2.93), insomnia 2.03; CI:1.33–3.09), compared those eastern Conclusion ongoing follow-up will provide valuable insights into short, medium, long-term health impact related material emitted based level suffered by affected population.

Язык: Английский

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Development of Cellulose Air Filters for Capturing Fine and Ultrafine Particles through the Valorization of Banana Cultivation Biomass Waste

Environments, Год журнала: 2024, Номер 11(3), С. 50 - 50

Опубликована: Март 7, 2024

Outdoor and indoor atmospheric pollution is one of the major problems that humanity continues to face. As a mitigation pathway, numerous technologies have been developed for air purification, including use fibrous filters. In this study, particle capture efficiencies pressure drops filters manufactured with cellulose pulp extracted from banana pseudostems were studied across three size ranges (PM10, PM2.5, PM1). Two pretreatments applied, alkaline soda-antraquinone (alkali-treated pulp) subsequent bleaching process (bleached pulp), four manufacturing processes tested: crushing, freeze-drying, vacuum filtration, pressing. addition, study varying filter grammage (70, 100, 160 g·m−2) pressing pressures (2, 4, 6, 8 t) was also performed. After conducting these tests, bleached pulp, having g·m−2 pressed at 4 t, deemed optimal individual solution. It demonstrated high retention all (with values exceeding 80%), moderate drop below 1000 Pa, thermal stability (degradation above 220 °C). However, combining freeze-drying two-ton yielded improved results (83% smallest particles 89% others) approximately half drop. Based on results, stands as noteworthy contribution waste valorization advancement environmentally friendly materials This achieved through adoption simple cost-effective technology, coupled utilization 100% natural agricultural primary material.

Язык: Английский

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