ANALYSIS OF THE FASCODE MODEL AND ITS H2O CONTINUUM BASED ON LONG-PATH ATMOSPHERIC TRANSMISSION MEASUREMENTS IN THE 4.5-11.5-MU M REGION

Authors
  1. Theriault, J-M.
  2. Roney, P.L.
  3. St-Germain, D.
  4. Revercomb, H.E.
  5. Knuteson, R.O.
  6. Smith, W.L.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Cooperative Inst for Meteorological Satellites Studies, Madison WI (US)
Abstract
An experimental study performed to evaluate the atmospheric transmission model FASCODE and its water vapor continuum in the 850-2250-cm super -1 spectral region is presented. The analysis is based on a comparison between model calculations and transmission measurements carried out at the Defence Research Establishment Valcartier over a 5.7-km horizontal path for a wide range of ambient temperature (from -8.6 to 29.4C) and humidity (from 1.6 to 14.2 g/m cube) conditions. The agreement between measurements and calculations is good on the average. However, there are three specific spectral intervals where the differences cannot be explained by experimental errors. For summer conditions, it is shown that FASCODE overestimates the transmittance by approximately 3-6% (absolute terms) in the 850-950-cm super 1 region. For winter conditions, measurements are higher than calculations by as much as a factor of 2 at the edges of the 6.3-mu m absorption band of water vapor, namely near 1250-1380 cm super 1 and 1800-2000 cm super 1. The continuous nature of these differences is interpreted as anomalies that are due to the broadening coefficients of the water vapor continuum (CKD model). TRUNCATED
Date of publication
09 Aug 1993
Number of Pages
11
Reprinted from
Applied Optics, vol 33, no 3, 1994, p 323-333
DSTKIM No
94-03141
CANDIS No
141324
Format(s):
Hardcopy;Originator's fiche received by DSIS

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