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Spectral aerosol optical depth retrievals by ground-based fourier transform infrared spectrometry

Barreto, Á.; García, O. E.; Schneider, Matthias; García, R. D.; Hase, F.; Sepúlveda, E.; Almansa, A. F.; Cuevas, E.; Blumenstock, Thomas

Abstract:
Aerosol Optical Depth (AOD) and the Ångström Exponent (AE) have been calculated in the near infrared (NIR) and short-wave infrared (SWIR) spectral regions over a period of one year (May 2019–May 2020) at the high-mountain Izaña Observatory (IZO) from Fourier Transform Infrared (FTIR) solar spectra. The high-resolution FTIR measurements were carried out coincidentally with Cimel CE318-T photometric observations in the framework of the Aerosol Robotic Network (AERONET). A spectral FTIR AOD was generated using two different approaches: by means of the selection of seven narrow FTIR micro-windows (centred at 1020.90, 1238.25, 1558.25, 1636.00, 2133.40, 2192.00, and 2314.20 nm) with negligible atmospheric gaseous absorption, and by using the CE318-AERONET’s response function in the near-coincident bands (1020 nm and 1640 nm) to degrade the high-resolution FTIR spectra. The FTIR system was absolutely calibrated by means of a continuous Langley–Plot analysis over the 1-year period. An important temporal drift of the calibration constant was observed as a result of the environmental exposure of the FTIR’s external optical mirrors (linear degradation rate up to 1.75% month−1). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125666
Veröffentlicht am 05.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2072-4292
KITopen-ID: 1000125666
Erschienen in Remote sensing
Band 12
Heft 19
Seiten Art.-Nr.: 3148
Schlagwörter aerosol optical depth; Fourier transform infrared spectrometry; atmospheric aerosols; infrared remote sensing
Nachgewiesen in Scopus
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