Observational constraints on non-Lorentzian continuum effects in the near-infrared solar spectrum using ARM ARESE data.

Details Observational constraints on non-Lorentzian continuum effects in the near-infrared solar spectrum using ARM ARESE data. Observational constraints on non-Lorentzian continuum effects in the near-infrared solar spectrum using ARM ARESE data.

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jqsrt..60..231v&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 60, issue 2, pp. 231-246

Computer Science

16

Earth Atmosphere: Water Vapor, Earth Atmosphere: Infrared Spectra, Earth Atmosphere: Absorption Spectra, Earth Atmosphere: Solar Spectrum

Scientific paper

Uncertainties exist in the magnitude of the water vapor continuum at solar wavelengths and many models do not include a solar continuum. The authors assess whether the neglect of the continuum in some models could explain a significant amount of the excess solar absorption found by several studies, in which the observed atmospheric solar absorption is significantly greater than that modelled. Towards this goal, the authors constrain the magnitude of the near-infrared water vapor continuum absorption using observations from the Atmospheric Radiation Measurement (ARM) Enhanced Short-wave Experiment (ARESE). Narrow-band irradiances measured by two independent Multifilter Rotating Shadowband Radiometers (MFRSRs) are used to infer the clear-sky transmission by water vapor in the 0.94 μm band. Over 16000 such observations are compared to non-continuum (i.e. a pure Lorentzian model) and continuum calculations using a correlated-k distribution model, which shows excellent agreement with a line-by-line model and uses coincident measurements of the pressure, temperature and water vapor profiles. Continuum calculations use the CKD super-Lorentzian formulation. The data suggest the need for a far wing continuum in the 0.94 μm band with an absorption that falls between that computed for pure Lorentzian lines and the CKD continuum.

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