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Recovering long-term aerosol optical depth series (1976–2012) from an astronomical potassium-based resonance scattering spectrometer
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dc.contributor.authorBarreto Velasco, África-
dc.contributor.authorCuevas Agulló, Emilio-
dc.contributor.authorPallé, P.-
dc.contributor.authorRomero Campos, Pedro Miguel-
dc.contributor.authorGuirado-Fuentes, Carmen-
dc.contributor.authorWehrli, C. J.-
dc.contributor.authorAlmansa Rodríguez, Antonio Fernando-
dc.identifier.citationAtmospheric Measurement Techniques. 2014, 7(12), p. 4103-4116es_ES
dc.description.abstractA 37-year long-term series of monochromatic aerosol optical depth (AOD) has been recovered from solar irradiance measurements performed with the solar spectrometer Mark-I, deployed at Izaña mountain since 1976. The instrument operation is based on the method of resonant scattering, which affords wavelength absolute reference and stability (long-term stability and high precision) in comparison to other instruments based purely on interference filters. However, it has been specifically designed as a reference instrument for helioseismology, and its ability to determine AOD from transmitted and scattered monochromatic radiation at 769.9 nm inside a potassium vapour cell in the presence of a permanent magnetic field is evaluated in this paper. Particularly, the use of an exposed mirror arrangement to collect sunlight as well as the Sun–laboratory velocity dependence of the scattered component introduces some important inconveniences to overcome when we perform the instrument's calibration. We have solved this problem using a quasi-continuous Langley calibration technique and a refinement procedure to correct for calibration errors as well as for the fictitious diurnal cycle on AOD data. Our results showed similar calibration errors retrieved by means of this quasi-continuous Langley technique applied in different aerosol load events (from 0.04 to 0.3), provided aerosol concentration remains constant throughout the calibration interval.es_ES
dc.description.sponsorshipThe AERONET sun photometers at Izaña have been calibrated within AERONET-Europe TNA supported by the European Community-Research Infrastructure Action under the FP7 “Capacities” specific programme for Integrating Activities, ACTRIS grant agreement no. 262254. The GAW-PFR network for AOD at WMO-GAW global observatories has been implemented by the World Optical Depth Research and Calibration Center (WORCC). Mark-I operation was supported by the Spanish National Plan of Research and Development under grant no. AYA2012–17803.-
dc.publisherEuropean Geosciences Uniones_ES
dc.subjectContaminación atmosféricaes_ES
dc.subjectAerosol optical depthes_ES
dc.titleRecovering long-term aerosol optical depth series (1976–2012) from an astronomical potassium-based resonance scattering spectrometeres_ES
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