Aerosol Optical Thickness within the FieldSpec FR PRO Spectral Domain during SEN2FLEX Campaign (Contributo in atti di convegno)

Type
Label
  • Aerosol Optical Thickness within the FieldSpec FR PRO Spectral Domain during SEN2FLEX Campaign (Contributo in atti di convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bassani Cristiana; Estellés Victor; Cavalli Rosa Maria; Pignatti Stefano; Martinez-Lozano JA (2006)
    Aerosol Optical Thickness within the FieldSpec FR PRO Spectral Domain during SEN2FLEX Campaign
    in ESA Conference: SENtinel-2 and FLuorescence EXperiment (SEN2FLEX), Noordwijk, Netherlands, 30-31 Ottobre 2006
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bassani Cristiana; Estellés Victor; Cavalli Rosa Maria; Pignatti Stefano; Martinez-Lozano JA (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR Università di Valencia (Spagna) (literal)
Titolo
  • Aerosol Optical Thickness within the FieldSpec FR PRO Spectral Domain during SEN2FLEX Campaign (literal)
Abstract
  • Aerosols are the atmospheric constituents which mostly affect the solar radiance value within the atmospheric window regions. The optical parameters characterizing the aerosols can be determined by solar irradiance measurements. If the direct component of the solar irradiance reaching the ground is measured, the parameter which defines the attenuation of the solar radiance when it propagates through the atmosphere is the Aerosol Optical Thickness (AOT). This paper describes the method of retrieving the AOT starting from direct solar irradiance acquired by a FieldSpec FR PRO (ASD) during the SENtinel-2 and Fluorescence Experiment (SEN2FLEX) campaign. The estimated AOTs are then compared with those measured by a collocated CIMEL Sun photometer acquired simultaneously with ASD. To determine the AOT derived from ASD irradiances in a way completely independent of CIMEL, an estimation of the calibration coefficient has been made by means of the Langley-plot calibration during a campaign held before SEN2FLEX. Without the Langley plot calibration of the ASD, the series of direct solar irradiance measurements is only able to reproduce AOT temporal trends and variation, but not the AOT absolute value. Once the Langley calibration has been obtained, the AOT can be routinely obtained using the Langley calibration of ASD and the direct irradiance measurements. The values of AOT retrieved with the ASD in this way have been compared to the CIMEL AOT values, in order to characterize the usefulness of this instrument to retrieve AOT. Moreover, having considered that the AOT is a physical quantity depending on the wavelength, it has been possible to determine its value throughout the entire ASD spectral domain (350-2500nm) even if the most reliable and useful AOT values are those related to wavelengths of the CIMEL channels (340, 380, 440, 500, 670, 870, 1020 nm) because they are located within atmospheric windows where the absorption of gases is minimized. (literal)
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