Nimbus-7 CZCS: confirmation of its radiometric sensitivity decay rate through 1982

James L. Mueller

doi:10.1364/AO.24.001043

Nimbus-7 CZCS: confirmation of its radiometric sensitivity decay rate through 1982

James L. Mueller

Applied Optics
Vol. 24,
Issue 7,
pp. 1043-1047
(1985)
•https://doi.org/10.1364/AO.24.001043

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James L. Mueller, "Nimbus-7 CZCS: confirmation of its radiometric sensitivity decay rate through 1982," Appl. Opt. 24, 1043-1047 (1985)

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History
- Original Manuscript: October 22, 1984
- Published: April 1, 1985

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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%.

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						CZCS digital counts (0…255)
Case	Day	Year	Nimbus-7 orbit	Gain	λ = 443	520	550	670 nm
1	289	1979	4944	2	158	124	119	102
2	289	1979	4944	2	144	112	108	90
3	273	1979	4723	2	154	118	112	88
4	312	1979	5262	3	155	124	121	106
5	312	1979	5262	3	156	130	129	124
6	327	1979	5469	2	131	106	102	87
7	327	1979	5469	2	109	88	85	70
8	138	1980	7901	1	150	126	123	105
9	138	1980	7901	1	147	125	121	107
10	193	1980	8661	1	144	126	122	104
11	245	1982	19480	1	124	111	114	115
12	245	1982	19480	1	116	104	105	98
13	278	1982	19936	1	100	92	94	90
14	278	1982	19936	1	105	96	97	94
15	289	1982	20088	1	91	85	86	83
16	307	1982	20337	2	125	120	126	128
17	307	1982	20337	2	106	102	106	110
18	318	1982	20489	2	111	106	112	121
19	318	1982	20489	2	118	116	122	128

	Latitude deg–min	Longitude deg–min	View direction		Solar direction
Case	Latitude deg–min	Longitude deg–min	θ (deg)	ϕ (deg)	θ₀ (deg)	ϕ₀ (deg)
1	28–25.15 N	133–17.94 W	40.4	076.4	38.7	163.0
2	33–20.06 N	133–38.40 W	33.8	075.9	43.4	164.6
3	34–16.90 N	137–51.64 W	40.0	074.2	38.9	158.0
4	30–02.39 N	132–54.68 W	09.4	078.6	46.8	173.5
5	30–50.50 N	130–53.28 W	05.1	259.9	47.5	176.2
6	31–23.17 N	132–36.63 W	42.3	074.9	53.0	165.5
7	33–43.69 N	128–13.83 W	16.9	077.2	54.6	171.0
8	35–17.89 N	131–26.95 W	45.4	101.2	21.1	134.3
9	36–31.55 N	131–13.27 W	43.0	103.3	21.8	137.1
10	32–25.08 N	127–49.58 W	42.5	105.6	17.8	121.8
11	32–57.77 N	130–24.59 W	29.0	129.3	27.2	154.4
12	35–57.19 N	128–57.78 W	23.5	158.5	29.4	159.8
13	33–29.00 N	127–09.77 W	21.6	108.7	38.3	165.5
14	33–56.22 N	129–48.73 W	33.1	094.9	39.3	161.6
15	37–44.01 N	129–52.54 W	31.5	087.2	48.0	164.2
16	29–32.04 N	134–39.24 W	42.3	075.5	46.2	164.5
17	33–05.22 N	131–18.22 W	20.0	077.6	49.0	169.8
18	30–05.49 N	130–04.43 W	25.8	077.1	49.0	169.3
19	32–37.95 N	134–50.71 W	43.2	074.4	52.4	164.3

λ (nm)	$\bar{a (λ)}$	s_a(λ)	$\bar{b (λ)} \times 10^{5}$	s_b(λ) × 10⁵	$\bar{s_{g} (λ)}$
443	0.9947	0.0084	1.788	0.068	0.040
520	0.9642	0.0024	0.697	0.027	0.020
550	0.9406	0.0041	0.428	0.039	0.020

						CZCS digital counts (0…255)
Case	Day	Year	Nimbus-7 orbit	Gain	λ = 443	520	550	670 nm
1	289	1979	4944	2	158	124	119	102
2	289	1979	4944	2	144	112	108	90
3	273	1979	4723	2	154	118	112	88
4	312	1979	5262	3	155	124	121	106
5	312	1979	5262	3	156	130	129	124
6	327	1979	5469	2	131	106	102	87
7	327	1979	5469	2	109	88	85	70
8	138	1980	7901	1	150	126	123	105
9	138	1980	7901	1	147	125	121	107
10	193	1980	8661	1	144	126	122	104
11	245	1982	19480	1	124	111	114	115
12	245	1982	19480	1	116	104	105	98
13	278	1982	19936	1	100	92	94	90
14	278	1982	19936	1	105	96	97	94
15	289	1982	20088	1	91	85	86	83
16	307	1982	20337	2	125	120	126	128
17	307	1982	20337	2	106	102	106	110
18	318	1982	20489	2	111	106	112	121
19	318	1982	20489	2	118	116	122	128

	Latitude deg–min	Longitude deg–min	View direction		Solar direction
Case	Latitude deg–min	Longitude deg–min	θ (deg)	ϕ (deg)	θ₀ (deg)	ϕ₀ (deg)
1	28–25.15 N	133–17.94 W	40.4	076.4	38.7	163.0
2	33–20.06 N	133–38.40 W	33.8	075.9	43.4	164.6
3	34–16.90 N	137–51.64 W	40.0	074.2	38.9	158.0
4	30–02.39 N	132–54.68 W	09.4	078.6	46.8	173.5
5	30–50.50 N	130–53.28 W	05.1	259.9	47.5	176.2
6	31–23.17 N	132–36.63 W	42.3	074.9	53.0	165.5
7	33–43.69 N	128–13.83 W	16.9	077.2	54.6	171.0
8	35–17.89 N	131–26.95 W	45.4	101.2	21.1	134.3
9	36–31.55 N	131–13.27 W	43.0	103.3	21.8	137.1
10	32–25.08 N	127–49.58 W	42.5	105.6	17.8	121.8
11	32–57.77 N	130–24.59 W	29.0	129.3	27.2	154.4
12	35–57.19 N	128–57.78 W	23.5	158.5	29.4	159.8
13	33–29.00 N	127–09.77 W	21.6	108.7	38.3	165.5
14	33–56.22 N	129–48.73 W	33.1	094.9	39.3	161.6
15	37–44.01 N	129–52.54 W	31.5	087.2	48.0	164.2
16	29–32.04 N	134–39.24 W	42.3	075.5	46.2	164.5
17	33–05.22 N	131–18.22 W	20.0	077.6	49.0	169.8
18	30–05.49 N	130–04.43 W	25.8	077.1	49.0	169.3
19	32–37.95 N	134–50.71 W	43.2	074.4	52.4	164.3

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