Abstract

The rates of decay in radiometric sensitivities of channels 1, 2, and 3 of the Nimbus-7 Coastal Zone Color Scanner (CZCS) have been determined using data from the clear water masses of the NE Pacific central gyre. Gain correction coefficients g(λ,N) are presented as linear functions of Nimbus-7 orbit number N, which are, valid through 1982. Internal consistency in the present analysis and comparison with previously published results suggest that corrected radiances are precise within ∼5%.

© 1985 Optical Society of America

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References

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  1. H. R. Gordon, J. W. Brown, O. B. Brown, R. H. Evans, D. K. Clark, “Nimbus 7 CZCS: Reduction of its Radiometric Sensitivity with Time,” Appl. Opt. 22, 3929 (1983).
    [CrossRef] [PubMed]
  2. H. R. Gordon, D. K. Clark, J. W. Brown, O. B. Brown, R. H. Evans, W. W. Broenkow, “Phytoplankton Pigment Concentrations in the Middle Atlantic Bight: Comparison of Ship Determinations and CZCS Estimates,” Appl. Opt. 22, 20 (1983).
    [CrossRef] [PubMed]
  3. H. R. Gordon, D. K. Clark, “Clear Water Radiances for Atmospheric Correction of Coastal Zone Color Scanner Imagery,” Appl. Opt. 20, 4175 (1981).
    [CrossRef] [PubMed]
  4. R. W. Austin, T. J. Petzold, “The Determination of the Diffuse Attenuation Coefficient of Sea Water Using the Coastal Zone Color Scanner,” in Oceanography from Space, J. F. R. Gower, Ed. (Plenum, New York, 1981), pp. 239–256.
    [CrossRef]

1983

1981

Austin, R. W.

R. W. Austin, T. J. Petzold, “The Determination of the Diffuse Attenuation Coefficient of Sea Water Using the Coastal Zone Color Scanner,” in Oceanography from Space, J. F. R. Gower, Ed. (Plenum, New York, 1981), pp. 239–256.
[CrossRef]

Broenkow, W. W.

Brown, J. W.

Brown, O. B.

Clark, D. K.

Evans, R. H.

Gordon, H. R.

Petzold, T. J.

R. W. Austin, T. J. Petzold, “The Determination of the Diffuse Attenuation Coefficient of Sea Water Using the Coastal Zone Color Scanner,” in Oceanography from Space, J. F. R. Gower, Ed. (Plenum, New York, 1981), pp. 239–256.
[CrossRef]

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Figures (1)

Fig. 1
Fig. 1

Corrections for radiometric sensitivity decay of the Nimbus-7 CZCS through its first four years of operation for channels 1, 2, and 3 (443, 520, and 550 nm). The linear regression models (solid lines) are the average fits over 20 replications with independent samples of Gaussian random noise. The circles represent decay coefficients calculated for pixels in the central water masses of the NE Pacific subtropical gyre. Squares are data points generated using the radiometric sensitivity decay correction models of Gordon et al.1 with random noise, and the dashed lines illustrate their models.

Tables (3)

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Table I Selected CZCS Data from the NE Pacific Central Gyre

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Table II Geographic Locations of Pixels in Table I, Together with Local Zenith and Azimuth (Clockwise from North) Angles of Vectors Pointing to Nimbus-7 (θ, ϕ) and the Sun (θ0,ϕ0)

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Table III CZCS Radiometric Sensitivity Decay Coefficients a ( λ ) ¯ and b ( λ ) ¯ Derived from 20 Replications with Independent Samples of Random Noise; Also Shown are Standard Deviations sa(λ) and sb(λ) of the Regression Coefficients, and the Mean Standard Deviation s g ( λ ) ¯ of g(λ,N) About the Regression Line

Equations (12)

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g ( λ , N ) L t ( λ ) = L r ( λ ) + t d ( λ ) L w ( λ ) + S ( λ , 670 ) × [ L t ( 670 ) L r ( 670 ) t d ( 670 ) L w ( 670 ) ] ,
g ( λ , N ) = C ( λ ) f ( λ , N )
K ( 490 ) ¯ = 0.034 m 1
s K = 0.0024 m 1 .
n j = 0.9 + 0.22 X 1 j ,
K j ( 490 ) = 0.0340 + 0.0024 X 2 j m 1 ,
L wj ( 520 ) = L wcj ( 520 ) ( 1 + 0.06 X 3 j ) , L wj ( 550 ) = L wcj ( 550 ) ( 1 + 0.06 X 4 j ) ,
L wj ( 443 ) = L wj ( 550 ) [ K j ( 490 ) 0.022 0.0883 ] 0.6707 .
g ( λ , N ) = a ( λ ) + b ( λ ) N ,
a ( λ ) ¯
b ( λ ) ¯ × 10 5
s g ( λ ) ¯

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