Izaña Atmospheric Research Center. Activity Report 2015-2016

Agulló, Emilio Cuevas; Milford, C.; Bustos, Juan José de; Hernández, Rubén del Campo; Rodríguez, Omaira; Cabrera, Rosa Delia García; Peláez, Ángel Jesús Gómez; Guirado-Fuentes, Carmen; Marrero, Carlos; Porta, Natalia Prats; López, Ramón Ramos; Redondas, Alberto; Reyes, Enrique; Rodríguez, Silvia López; Campos, Pedro Miguel Romero; Schneider, Mat­thias; Belmonte, Jordina; Yela, Margarita; Rodríguez, Antonio F. Almansa; Barreto, África; López-Solano, C.; Basart, Sara; Terradellas, Enric; Gómez, Sergio Afonso; Bayo-Pérez, Concepción; Berjón, Alberto; Bethencourt, José Francisco; Corbella, Virgilio Carreño; Castro, N.; Cruz, Antonia Macedo; Damas, M. C.; Ajamil, Fernando de Ory; García, M. I.; Gómez-Trueba, Vanessa; Ramos, Yenny González; Hernández, C.; Hernandéz, Y.; Cruz, Bentorey Hernández; Jover, M.; León-Luis, Sergio F.; Fernandez, Rudy; López-Solano, J.; Rodríguez, Eduardo; Franco, Juan José Rodríguez; Valido, M. Rodríguez; Sálamo, C.; Sanromá, Esther; Santana-Díaz, Daniel; Tomás, Félix Santo; Hernández, Eliezer Sepúlveda; Ramos, Marta Sierra; Sosa, E. Gonzales

doi:10.31978/014-17-012-9

Cited by 3 publications

(1 citation statement)

References 46 publications

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“…However, some periods with fast sinking (h P 0.5 km, i.e., well below the volcano altitude) were observed on weeks 5 and 10. On week 5, this sinking of the lowermost volcanic plume was associated with a weekly peak of SO 2 and PM 2.5-10 at the surface [20]. For comparison, the authors of [21], who estimated the volcanic plume height of the eruption of Eyjafjallajökull volcano using a C-band weather radar, found a volcanic plume height at an altitude ranging from 5 to 10 km during explosive phases and generally in the first kilometer above the volcano altitude the rest of the time.…”

Section: Temporal Evolution 16 October-31 December 2021mentioning

confidence: 97%

Volcanic Eruption of Cumbre Vieja, La Palma, Spain: A First Insight to the Particulate Matter Injected in the Troposphere

et al. 2022

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The volcanic eruption of Cumbre Vieja (La Palma Island, Spain), started on 19 September 2021 and was declared terminated on 25 December 2021. A complete set of aerosol measurements were deployed around the volcano within the first month of the eruptive activity. This paper describes the results of the observations made at Tazacorte on the west bank of the island where a polarized micro-pulse lidar was deployed. The analyzed two-and-a-half months (16 October–31 December) reveal that the peak height of the lowermost and strongest volcanic plume did not exceed 3 km (the mean of the hourly values is 1.43 ± 0.45 km over the whole period) and was highly variable. The peak height of the lowermost volcanic plume steadily increased until week 11 after the eruption started (and 3 weeks before its end) and started decreasing afterward. The ash mass concentration was assessed with a method based on the polarization capability of the instrument. Two days with a high ash load were selected: The ash backscatter coefficient, aerosol optical depth, and the volume and particle depolarization ratios were, respectively, 3.6 (2.4) Mm−1sr−1, 0.52 (0.19), 0.13 (0.07) and 0.23 (0.13) on 18 October (15 November). Considering the limitation of current remote sensing techniques to detect large-to-giant particles, the ash mass concentration on the day with the highest ash load (18 October) was estimated to have peaked in the range of 800–3200 μg m−3 in the lowermost layer below 2.5 km.

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Section: Temporal Evolution 16 October-31 December 2021mentioning

confidence: 97%

Volcanic Eruption of Cumbre Vieja, La Palma, Spain: A First Insight to the Particulate Matter Injected in the Troposphere

et al. 2022

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Screening Approach of the Langley Calibration Station for Sun Photometers in China

Xun,

Liu,

et al. 2023

Atmosphere

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A sun photometer is a type of photometer that points at the sun, and it has been playing an increasingly important role in characterizing aerosols across the world. As long as the solar photometer is accurately calibrated, the optical thickness of the aerosol can be obtained from the measured value of this device. When the calibration of a single instrument is not accurate, the inversion quantity varies greatly. The calibration constant of the sun photometer changes during its use process; thus, calibrations are frequently needed in order to ensure the accuracy of the measured value. The calibration constant of the solar photometer is usually determined using the Langley method. Internationally, AERONET has two Langley calibration stations: the Mauna Loa observatory in the United States and the Izaña observatory in Spain. So far, the International Comparison and Calibration System has been established in Beijing, similar to AERONET at GSFC, but the Langley calibration system has not yet been established. Therefore, it is necessary to select a suitable calibration station in China. This paper studies the requirements of the calibration station using the Langley method. We used long-term records of satellite-derived measurements and survey data belonging to the aerosol optical thickness data of SNPP/VIIRS, CERES, MERRA-2, etc., in order to gain a better understanding of whether these stations are suitable for calibration. From the existing astronomical observation stations, meteorological stations, and the Sun–Sky Radiometer Observation Network (SONET) observation stations in China, the qualified stations were selected. According to the statistical data from the Ali observatory, the monthly average of clear sky is 20.21 days, and it is always greater than 15 days. The monthly average of aerosol is not more than 0.15 and is less than 0.3. We believe that the atmosphere above the Ali observatory is stable, and the results show that the Ali observatory has excellent weather conditions. This study can provide a selection of calibration sites for solar photometer calibrations in China that may need to be further characterized and evaluated, and at the same time provide a method to exclude unsuitable calibration sites.

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Column Integrated Water Vapor and Aerosol Load Characterization with the New ZEN-R52 Radiometer

et al. 2020

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The study shows the first results of the column-integrated water vapor retrieved by the new ZEN-R52 radiometer. This new radiometer has been specifically designed to monitor aerosols and atmospheric water vapor with a high degree of autonomy and robustness in order to allow the expansion of the observations of these parameters to remote desert areas from ground-based platforms. The ZEN-R52 device shows substantial improvements compared to the previous ZEN-R41 prototype: a smaller field of view, an increased signal-to-noise ratio, better stray light rejection, and an additional channel (940 nm) for precipitable water vapor (PWV) retrieval. PWV is inferred from the ZEN-R52 Zenith Sky Radiance (ZSR) measurements using a lookup table (LUT) methodology. The improvement of the new ZEN-R52 in terms of ZSR was verified by means of a comparison with the ZEN-R41, and with the Aerosol Robotic Network (AERONET) Cimel CE318 (CE318-AERONET) at Izaña Observatory, a Global Atmosphere Watch (GAW) high mountain station (Tenerife, Canary Islands, Spain), over a 10-month period (August 2017 to June 2018). ZEN-R52 aerosol optical depth (AOD) was extracted by means of the ZEN–AOD–LUT method with an uncertainty of ±0.01 ± 0.13*AOD. ZEN-R52 PWV extracted using a new LUT technique was compared with quasi-simultaneous (±30 s) Fourier Transform Infrared (FTIR) spectrometer measurements as reference. A good agreement was found between the two instruments (PWV means a relative difference of 9.1% and an uncertainty of ±0.089 cm or ±0.036 + 0.061*PWV for PWV <1 cm). This comparison analysis was extended using two PWV datasets from the same CE318 reference instrument at Izaña Observatory: one obtained from AERONET (CE318-AERONET), and another one using a specific calibration of the 940-nm channel performed in this work at Izaña Atmospheric Research Center Observatory (CE318-IARC), which improves the PWV product.

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Izaña Atmospheric Research Center. Activity Report 2015-2016

Cited by 3 publications

References 46 publications

Volcanic Eruption of Cumbre Vieja, La Palma, Spain: A First Insight to the Particulate Matter Injected in the Troposphere

Volcanic Eruption of Cumbre Vieja, La Palma, Spain: A First Insight to the Particulate Matter Injected in the Troposphere

Screening Approach of the Langley Calibration Station for Sun Photometers in China

Column Integrated Water Vapor and Aerosol Load Characterization with the New ZEN-R52 Radiometer

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