Abstract

A method is presented for determining in real time the infrared atmospheric transmittance along the line of sight of a tracking radiometer from measurements of background sky radiance. The case at hand involves observations from a high-altitude site in the tropics at wavelength bands from 8 to 21 μm. Hawaiian radiosonde atmospheric profiles were analyzed using the lowtran 5 spectroscopic code. Model atmospheres were found unsuitable for characterizing the variable meteorological conditions. The infrared transmittance and sky radiance are shown to have a very close correlation that allows determination of transmittance within a few percent from radiance data in spite of very large fluctuations in tropospheric humidity and variations in effective atmospheric temperature.

© 1984 Optical Society of America

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References

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  1. L. A. Young, “Correlation of Emission and Absorption in a Real Tropical Atmosphere,” Avco Everett Research Laboratory, Research Report 508 (Feb.1982).
  2. H. Riehl, Tropical Meteorology (McGraw-Hill, New York, 1954).
  3. E. Palmen, C. W. Newton, Atmospheric Circulation Systems (Academic, New York, 1969), Chap. 14.
  4. J. S. Malkus, H. Riehl, Cloud Structure and Distributions Over The Tropical Pacific Ocean (U. Calif. Press, Berkeley, 1964).
  5. F. J. Brousaides, Bull. Am. Meteorol. Soc. 56, 229 (1975).
    [CrossRef]
  6. J. M. Miller, Ed., “Geophysical Monitoring for Climate Change/No. 3/Summary Report—1974,” National Oceanic and Atmospheric Administration, Environmental Research Laboratories (Aug.1975).
  7. B. G. Mendonca, J. Appl. Meteorol. 8, 533 (1969).
    [CrossRef]
  8. B. G. Mendonca, W. T. Iwaoka, J. Appl. Meteorol. 8, 213 (1969).
    [CrossRef]
  9. R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).
  10. F. X. Kneizys et al., “Atmospheric Transmittance/Radiance: Computer Code lowtran 5,” AFGL-TR-80-0067 (21Feb.1980).

1975 (1)

F. J. Brousaides, Bull. Am. Meteorol. Soc. 56, 229 (1975).
[CrossRef]

1969 (2)

B. G. Mendonca, J. Appl. Meteorol. 8, 533 (1969).
[CrossRef]

B. G. Mendonca, W. T. Iwaoka, J. Appl. Meteorol. 8, 213 (1969).
[CrossRef]

Brousaides, F. J.

F. J. Brousaides, Bull. Am. Meteorol. Soc. 56, 229 (1975).
[CrossRef]

Fenn, R. W.

R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).

Garing, J. S.

R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).

Iwaoka, W. T.

B. G. Mendonca, W. T. Iwaoka, J. Appl. Meteorol. 8, 213 (1969).
[CrossRef]

Kneizys, F. X.

F. X. Kneizys et al., “Atmospheric Transmittance/Radiance: Computer Code lowtran 5,” AFGL-TR-80-0067 (21Feb.1980).

Malkus, J. S.

J. S. Malkus, H. Riehl, Cloud Structure and Distributions Over The Tropical Pacific Ocean (U. Calif. Press, Berkeley, 1964).

McClatchey, R. A.

R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).

Mendonca, B. G.

B. G. Mendonca, J. Appl. Meteorol. 8, 533 (1969).
[CrossRef]

B. G. Mendonca, W. T. Iwaoka, J. Appl. Meteorol. 8, 213 (1969).
[CrossRef]

Newton, C. W.

E. Palmen, C. W. Newton, Atmospheric Circulation Systems (Academic, New York, 1969), Chap. 14.

Palmen, E.

E. Palmen, C. W. Newton, Atmospheric Circulation Systems (Academic, New York, 1969), Chap. 14.

Riehl, H.

J. S. Malkus, H. Riehl, Cloud Structure and Distributions Over The Tropical Pacific Ocean (U. Calif. Press, Berkeley, 1964).

H. Riehl, Tropical Meteorology (McGraw-Hill, New York, 1954).

Selby, J. E. A.

R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).

Volz, F. E.

R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).

Young, L. A.

L. A. Young, “Correlation of Emission and Absorption in a Real Tropical Atmosphere,” Avco Everett Research Laboratory, Research Report 508 (Feb.1982).

Bull. Am. Meteorol. Soc. (1)

F. J. Brousaides, Bull. Am. Meteorol. Soc. 56, 229 (1975).
[CrossRef]

J. Appl. Meteorol. (2)

B. G. Mendonca, J. Appl. Meteorol. 8, 533 (1969).
[CrossRef]

B. G. Mendonca, W. T. Iwaoka, J. Appl. Meteorol. 8, 213 (1969).
[CrossRef]

Other (7)

R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, J. S. Garing, “Optical Properties of Atmosphere (Third Edition),” AFCRL-72-0497 (24Aug.1972).

F. X. Kneizys et al., “Atmospheric Transmittance/Radiance: Computer Code lowtran 5,” AFGL-TR-80-0067 (21Feb.1980).

L. A. Young, “Correlation of Emission and Absorption in a Real Tropical Atmosphere,” Avco Everett Research Laboratory, Research Report 508 (Feb.1982).

H. Riehl, Tropical Meteorology (McGraw-Hill, New York, 1954).

E. Palmen, C. W. Newton, Atmospheric Circulation Systems (Academic, New York, 1969), Chap. 14.

J. S. Malkus, H. Riehl, Cloud Structure and Distributions Over The Tropical Pacific Ocean (U. Calif. Press, Berkeley, 1964).

J. M. Miller, Ed., “Geophysical Monitoring for Climate Change/No. 3/Summary Report—1974,” National Oceanic and Atmospheric Administration, Environmental Research Laboratories (Aug.1975).

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Figures (13)

Fig. 1
Fig. 1

Correlation of transmittance and radiance in channel 5 for 1 yr at zenith angle of 0° using Hilo data.

Fig. 2
Fig. 2

Correlation of transmittance and radiance in channel 5 for 1 yr at zenith angle of 60° using Hilo data.

Fig. 3
Fig. 3

Deviation of transmittance from least-squares fit in Fig. 2.

Fig. 4
Fig. 4

Correlation of transmittance and radiance in channel 5 at zenith angle of 75.5°.

Fig. 5
Fig. 5

Correlation of transmittance and radiance in channel 3 at zenith angle of 60°.

Fig. 6
Fig. 6

Correlation of transmittance and radiance in channel 4 at zenith angle of 60°.

Fig. 7
Fig. 7

Correlation of transmittance and radiance in channel 6 at zenith angle of 60°.

Fig. 8
Fig. 8

Correlation of transmittance and radiance in channel 5 for July.

Fig. 9
Fig. 9

Correlation of transmittance and radiance in channel 5 for January.

Fig. 10
Fig. 10

Temperatures of atmospheric constituents.

Fig. 11
Fig. 11

Correlation of transmittance and radiance in channel 5 at zenith angle of 60° using Maui data.

Fig. 12
Fig. 12

Correlation of transmittance and radiance in channel 5 at zenith angle of 75.5° using Maui data.

Fig. 13
Fig. 13

Correlation for transmittance in channel 5 vs local relative humidity.

Tables (1)

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Table I AMTAa Spectral Filter Channels

Equations (5)

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L ν = ɛ ν L ν 0 ( T eff ) .
ɛ ν = A ν .
A ν + τ ν + s ν = 1 ,
L ν = ( 1 - τ ν ) L ν 0 ( T eff ) .
L = ( 1 - τ ν ) L ν 0 ( T eff ) Δ ν .

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