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L Tallis, K Shine, T Gardiner, M Coleman

Assessment of the consistency of near infrared water vapour line intensities in recent HITRAN databases using ground based FTIR spectrometer measurements of solar radiation. L Tallis, K Shine, T Gardiner, M Coleman. Analysis Method. In a similar way to Casanova, et al. (2006)

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L Tallis, K Shine, T Gardiner, M Coleman

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  1. Assessment of the consistency of near infrared water vapour line intensities in recent HITRAN databases using ground based FTIR spectrometer measurements of solar radiation L Tallis, K Shine, T Gardiner, M Coleman

  2. Analysis Method • In a similar way to Casanova, et al. (2006) • Optical depth spectrum given by Where Fm is the measured signal by the FTIR, Fs is the extraterestrial irradiance given by Kurucz (1995), τm is the optical depth, θ is the solar zenith angle and k(v) is an unknown calibration factor. • Rearrangement, ignoring the calibration factor

  3. Fit • Optical depth is calculated for water vapour (τw) and for five other principle absorbers in the region: CH4, CO2, O2, N2O and O3 (τg) using RFM • Linear fit of the “pseudo” optical depth to that calculated by RFM • Fit pseudo to the form of a x τw + τg + b

  4. Fit

  5. Retrieved “a” parameter

  6. Retrieved “a” parameter HITRAN 2004 HITRAN 2008 HITRAN 2008 / HITRAN 2004 InSb / CaF2 Setup

  7. Retrieved “a” parameter MCT / KBr Setup

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