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Uncertainties of the Intensity of the 1130 nm Band of Water VaporBelmiloud, et al have recently suggested that the HITRAN line intensities in the 1130 nm water vapor band are much too weak. Giver, et at corrected unit conversion errors to make the HITRAN intensities compatible with the original measurements of Mandin, et al, but Belmiloud, et al believe that many of those line intensity measurements were too weak, and they propose the total intensity of the 1130 nm water vapor band is 38% stronger than the sum of the HITRAN line intensities in this region. We have made independent assessments of this proposal using 2 spectra obtained with the Ames 25 meter base path White cell. The first was made using the moderate resolution (8 nm) solar spectral flux radiometer (SSFR) flight instrument with a White cell absorbing path of 506 meters and 10 torr water vapor pressure. Modeling this spectrum using the HITRAN linelist gives a reasonable match, and the model is not compatible when the HITRAN line intensities are increased by 38%. The second spectrum was obtained with a White cell path of 1106 meters and 12 torr water vapor pressure, using a Bomem FTIR with near Doppler width resolution. This spectrum is useful for measuring intensities of isolated weak lines to compare with the measurements of Mandin, et al. Unfortunately, as Belmiloud et al point out, at these conditions the strong lines are much too saturated for good intensity measurements. Our measurements of the weak lines are in reasonable agreement with those of Mandin, et al. Neither of our spectra supports the proposal of Belmiloud et al for a general 38% increase of the absorption intensity in the 1130 nm water vapor band.
Document ID
20010050103
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Giver, L. P.
(NASA Ames Research Center Moffett Field, CA United States)
Pilewskie, P.
(NASA Ames Research Center Moffett Field, CA United States)
Gore, W. J.
(NASA Ames Research Center Moffett Field, CA United States)
Chackerian, C., Jr.
(Search for Extraterrestrial Intelligence Inst. Mountain View, CA United States)
Varanasi, P.
(State Univ. of New York Stony Brook, NY United States)
Bergstrom, R.
(Bay Area Environmental Research Inst. Mountain View, CA United States)
Freedman, R. S.
(Space Physics Research Inst. Sunnyvale, CA United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Technology Utilization And Surface Transportation
Meeting Information
Meeting: Annual Atmospheric Radiation Measurements Science Team Meeting
Location: Atlanta, GA
Country: United States
Start Date: March 19, 2001
End Date: March 23, 2001
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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