Caracterización de las propiedades de los aerosoles en columna en la región subtropical

Fuentes, Carmen Guirado

doi:10.35376/10324/13220

Cited by 6 publications

(12 citation statements)

References 70 publications

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“…As Rodríguez et al [22] have found, the urban scale transport of air pollutants in this station is mainly driven by breeze circulation. Guirado-Fuentes [23] provided a complete aerosol characterization of this site. This author found that the AOD at 500 nm is typically lower than 0.15 and the Ångström Exponent calculated using 440-870 nm spectral bands (AE) is lower than 0.5.…”

Section: Meteorological State Agency Of Spain (Aemet) Facilitiesmentioning

confidence: 99%

“…The two high-mountain stations can be sporadically affected by dust-loaded Saharan air masses mainly in summer, impacting the subtropical free troposphere [15][16][17]. Guirado-Fuentes [23] performed a detailed aerosol characterization at Izaña, finding that predominant clean background conditions are observed at the station (48% of the year with AOD at 500 nm below 0.05), while dust conditions can be associated to AOD at 500 nm higher than 0.10 and large particles with AE values lower than 0.60. These contrasting atmospheric conditions allow the methodology presented in this paper to be performed under a wide range of AOD values: from pristine to moderate dust loads.…”

Section: Meteorological State Agency Of Spain (Aemet) Facilitiesmentioning

confidence: 99%

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Remote Sensing of Aerosols at Night with the CoSQM Sky Brightness Data

Marseille¹,

Aubé²,

Velasco³

et al. 2021

Preprint

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The aerosol optical depth is an important indicator of aerosol particle properties and associated radiative impacts. AOD determination is therefore very important to achieve relevant climate modeling. Most remote sensing techniques to retrieve aerosol optical depth are applicable to daytime given the high level of light available. The night represents half of the time but in such conditions only a few remote sensing techniques are available. Among these techniques, the most reliable are moon photometers and star photometers. In this paper, we attempt to fill gaps in the aerosol detection performed with the aforementioned techniques using night sky brightness measurements during moonless nights with the novel CoSQM: a portable, low cost and open-source multispectral photometer. In this paper, we present an innovative method for estimating the aerosol optical depth by using an empirical relationship between the zenith night sky brightness measured at night with the CoSQM and the aerosol optical depth retrieved at daytime from the AErosol Robotic NETwork. Such a method is especially suited to light-polluted regions with light pollution sources located within a few kilometers of the observation site. A coherent day-to-night aerosol optical depth and Ångström Exponent evolution in a set of 354 days and nights from August 2019 to February 2021 was verified at the location of Santa Cruz de Tenerife on the island of Tenerife, Spain. The preliminary uncertainty of this technique was evaluated using the variance under stable day-to-night conditions, set at 0.02 for aerosol optical depth and 0.75 for Ångström Exponent. These results indicate the set of CoSQM and the proposed methodology appear to be a promising tool to add new information on the aerosol optical properties at night, which could be of key importance to improve climate predictions.

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Section: Meteorological State Agency Of Spain (Aemet) Facilitiesmentioning

confidence: 99%

Section: Meteorological State Agency Of Spain (Aemet) Facilitiesmentioning

confidence: 99%

Remote Sensing of Aerosols at Night with the CoSQM Sky Brightness Data

Marseille¹,

Aubé²,

Velasco³

et al. 2021

Preprint

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“…Dust events are less frequent and with lower AOD outside those months. Note that dust transport in winter occurs at much lower altitude than in summer, therefore the aerosol column above the observatory is minor in winter as compared to summer dust events, in which dust can reach 5 km height (Ansmann et al, 2011;Guirado-Fuentes, 2015;Cuevas et al, 2015). Izaña is therefore a privileged location for studying Saharan dust within the Saharan Air Layer.…”

mentioning

confidence: 99%

Assessment of Sun photometer Langley calibration at the high-elevation sites Mauna Loa and Izaña

Toledano¹,

González²,

Fuertes³

et al. 2018

Preprint

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<p><strong>Abstract.</strong> The aim of this paper is to analyze the suitability of the high-mountain stations Mauna Loa and Iza&#241;a for Langley plot calibration of Sun photometers. Thus the aerosol optical depth (AOD) characteristics and seasonality, as well as the cloudiness, have been investigated in order to provide a robust estimation of the calibration accuracy, as well as the number of days that are suitable for Langley calibrations. The data used for the investigations belong to AERONET and GAW-PFR networks, which maintain reference Sun photometers at these stations with long measurement records: 22 years at Mauna Loa and 15 years at Iza&#241;a. In terms of clear sky and stable aerosol conditions, Mauna Loa (3397&#8201;m a.s.l.) exhibits on average of 377 Langleys (243 morning and 134 afternoon) per year suitable for Langley plot calibration, whereas Iza&#241;a (2373&#8201;m a.s.l.) shows 343 Langleys (187 morning and 155 afternoon) per year. The background AOD (500&#8201;nm wavelength) values, on days that are favorable for Langley calibrations, are in the range 0.01&#8211;0.02 throughout the year, with well-defined seasonality that exhibits a spring maximum at both stations plus a slight summer increase at Iza&#241;a. The statistical analysis of the long-term determination of extraterrestrial signals yields to a calibration uncertainty of ~&#8201;0.2&#8211;0.5&#8201;%, being this uncertainty smaller in the near infrared and larger in the ultraviolet wavelengths. This is due to atmospheric variability that cannot be reduced based only on quality criteria of individual Langely plots.</p>

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“…In terms of AOD, pristine conditions are prevalent in this station, with AOD at 500 nm below 0.1 and AE above 0.6 (Guirado-Fuentes, 2015). Relatively high AOD conditions due to the Saharan dust transport from North Africa sources to the Atlantic Ocean above the trade wind inversion are prevalent in summer (Basart et al, 2009;Rodríguez et al, 2011), associated typically with the presence of coarse particles (AE below 0.25) and AOD at 500 nm above 0.1 (Basart et al, 2009;García et al, 2012;Guirado-Fuentes, 2015). These privileged conditions make Izaña Observatory a suitable place for calibration and validation activities (Toledano et al, 2018).…”

Section: Resultsmentioning

confidence: 85%

“…En la parte derecha se puede ver la rueda de filtros que está instalada en la cabeza y la caja de control del fotometro. Imagen obtenida de Guirado-Fuentes (2015) 2.2.1 Familias de los fotómetros CIMEL El número de canales con los que cada instrumento realiza las medidas varía en función de la configuración del equipo. Existen múltiples configuraciones distintas de los fotómetros Cimel, pero todas ellas se pueden agrupar en las siguientes familias:…”

Section: Cimel Ce318unclassified

Desarrollo de nuevos métodos de procesado de datos de redes fotométricas para el análisis de propiedades del aerosol atmosférico

González¹

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Caracterización de las propiedades de los aerosoles en columna en la región subtropical

Abstract: A todos los mencionados anteriormente y a los que por despiste haya podido olvidar mencionar, mi más sincero agradecimiento. Y, finalmente, a ti lector de esta memoria de tesis doctoral, gracias por interesarte por ella.

Cited by 6 publications

References 70 publications

Remote Sensing of Aerosols at Night with the CoSQM Sky Brightness Data

Remote Sensing of Aerosols at Night with the CoSQM Sky Brightness Data

Assessment of Sun photometer Langley calibration at the high-elevation sites Mauna Loa and Izaña

Desarrollo de nuevos métodos de procesado de datos de redes fotométricas para el análisis de propiedades del aerosol atmosférico

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