Analysis of Atmospheric Interferometer Data.
Abstract
In this study on atmospheric transmission several examples of laser-transmisso-meter-calibrated, high-resolution Fourier transform spectrometer (FTS) measurements were compared with corresponding spectra generated using the FASCOD1C computer model. Experimental data were collected at three coastal sites and one inland site. Measurement path-lengths varied between 4.07 and 6.4 km. Water vapor partial pressures varied between 2.0 and 20.5 torr, partial pressure of water vapor. Of particular interest is the use of the experimental data in comparison to the water vapor continuum absorption infrared model contained in the FASCOD1C computer model. The data were found to agree with FASCODE predictions for the H2O continuum absorption to within the range of uncertainty of the experimental data. The N2 continuum absorption calculated using FASCOD1C appears to be smaller than that observed and this observation is thought to be related to an unmodeled temperature dependence in the N2 continuum absorption. The experimental high-resolution spectra were compared with calculated continuum absorption by selecting 49 discrete frequencies in the 1900 - 3200/cm region which were minimally influenced by discrete line absorption. Corrections for local line and N2 and CO2 continuum absorptions were applied to the experimental data at these 49 frequencies. The data were then compared with H2O continuum absorption coefficients calculated using the FASCOD1C model and the 1982 version of the AFGL atmospheric absorption line compilation. Detailed high-resolution comparisons of experimental data to FASCODE - generated spectra show excellent agreement in nearly all features throughout the 1900 - 3200/cm spectral region.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1984
- Accession Number
- ADA150682
Entities
People
- J. A. Dowling
- S. G. O'brien
- W. O. Gallery