Menang, K P*; Coleman, M D; Gardiner, T D; Ptashnik, I V*; Shine, K P* (2013) A high-resolution near-infrared extraterrestrial solar spectrum derived from ground-based Fourier transform spectrometer measurements. J. Geophys. Res. - Atmos., 118 (11). pp. 5319-5331.

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Abstract

A detailed spectrally-resolved extraterrestrial solar spectrum (ESS) is important for line-by-line radiative transfer modeling in the near-infrared (near-IR). Very few observationally-based high-resolution ESS are available in this spectral region. Consequently the theoretically-calculated ESS by Kurucz has been widely adopted. We present the CAVIAR (Continuum Absorption at Visible and Infrared Wavelengths and its Atmospheric Relevance) ESS which is derived using the Langley technique applied to calibrated observations using a ground-based high-resolution Fourier transform spectrometer (FTS) in atmospheric windows from 2000-10000 cm-1. There is good agreement between the strengths and positions of solar lines between the CAVIAR and the satellite based ACE-FTS (Atmospheric Chemistry Experiment-FTS) ESS, in the spectral region where they overlap, and good agreement with other ground-based FTS measurements in two near-IR windows. However there are significant differences in the structure between the CAVIAR ESS and spectra from semi-empirical models. We found a difference of up to 8 % in the absolute (and hence the wavelength-integrated) irradiance between the CAVIAR ESS and that of Thullier et al., which was based on measurements from the Atmospheric Laboratory for Applications and Science satellite. In many spectral regions, this difference is significant, as the k=2 uncertainties do not overlap. A similar difference has earlier been reported between the Thuillier and Spectral Irradiance Monitor (SIM) spectra. If the CAVIAR and SIM spectra are correct, this would indicate an integrated loss of solar irradiance of about 30 W m-2 in the near-IR that would have to be compensated by an increase at other wavelengths.

Item Type:	Article
Keywords:	water vapour, solar spectrum, Fourier Transform Spectroscopy
Subjects:	Environmental Measurement Environmental Measurement > Atmospheric Science, Emission and Security
Identification number/DOI:	10.1002/jgrd.50425
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5998

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