Visible infrared spin–scan radiometer atmospheric sounder radiometric calibration: an inflight evaluation from intercomparisons with HIRS and radiosonde measurements

W. Paul Menzel; William L. Smith; Leroy D. Herman

doi:10.1364/AO.20.003641

Applied Optics
Vol. 20,
Issue 20,
pp. 3641-3644
(1981)
•https://doi.org/10.1364/AO.20.003641

Visible infrared spin–scan radiometer atmospheric sounder radiometric calibration: an inflight evaluation from intercomparisons with HIRS and radiosonde measurements

W. Paul Menzel, William L. Smith, and Leroy D. Herman

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W. Paul Menzel, William L. Smith, and Leroy D. Herman, "Visible infrared spin–scan radiometer atmospheric sounder radiometric calibration: an inflight evaluation from intercomparisons with HIRS and radiosonde measurements," Appl. Opt. 20, 3641-3644 (1981)

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Abstract

The Visible IR spin–scan radiometer Atmospheric Sounder (VAS) is the first sounding instrument placed in geostationary orbit. The calibration procedure for determining VAS radiances requires modeling the contributions of the telescope foreoptics components to the background radiation. A simple relation between target radiance and detector output voltage is derived. The calibration procedure is successfully tested by comparisons with HIRS and radiosonde data. After removing a negative offset of up to 3°C in three of the upper atmospheric CO₂ bands of VAS, the capability to produce accurate soundings (within 2°C of radiosonde) was demonstrated.

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				[ $B^{- 1} (R_{V}^{est}) - (B^{- 1} (R_{V})$ ]

VAS bands		HIRS bandsa		11 Oct.b		9 Dec.b		19 Jan.b
#	ν (cm⁻¹)	#	ν (cm⁻¹)	abs (°C)	rel (°C)c	abs (°C)	rel (°C)	abs (°C)	rel (°C)
1	679	2	679	0.72	1.54	0.13	1.22	0.94	1.38
2	691	3	691	1.59	1.42	1.11	0.74	0.82	1.01
3	702	4	704	2.17	0.57	2.05	0.44	1.65	0.77
4	714	5	716	1.64	0.55	0.81	0.64	1.28	0.40
5	750	7	748	1.86	0.54	−0.49	0.72	−1.03	0.45
6	2210	14	2212	1.30	0.52	−0.47	0.70	−0.33	0.60
7	790	10	1217d	−2.93	1.11	−3.95	0.80	−5.61	0.61
8	895	8	900	0.43	1.28	−1.98	0.84	−3.61	0.92
9	1377	11	1363	−1.58	1.00	−2.05	0.84	−1.21	1.29
10	1487	12	1484	−0.09	0.99	−0.64	1.27	0.12	0.99
11	2250	15	2240	1.92	0.60	0.84	0.80	0.95	1.39
12	2535	18	2511	−1.90	1.43	2.48	1.94	−0.52.	1.84

	[B⁻¹(R_rad) − B⁻¹(R_V)]a

Band	abs (°C)	rel (°C)b
1	1.3	4.6
2	3.2	3.1
3	2.8	1.6
4	1.7	1.4
5	0.3	0.8
6	1.1	0.7
7	—	—
8	—	—
9	0.8	3.1
10	1.9	1.4
11	2.1	2.5
12	—	—

Band	[B⁻¹(R_nominal) − B⁻¹(R_−25mV)]a (°C)
1	1.5
2	3.3
3	2.2
4	1.8
5	1.0
6	1.1
7	0.8
8	0.6
9	1.0
10	1.5
11	3.6
12	0.5

				[ $B^{- 1} (R_{V}^{est}) - (B^{- 1} (R_{V})$ ]

VAS bands		HIRS bandsa		11 Oct.b		9 Dec.b		19 Jan.b
#	ν (cm⁻¹)	#	ν (cm⁻¹)	abs (°C)	rel (°C)c	abs (°C)	rel (°C)	abs (°C)	rel (°C)
1	679	2	679	0.72	1.54	0.13	1.22	0.94	1.38
2	691	3	691	1.59	1.42	1.11	0.74	0.82	1.01
3	702	4	704	2.17	0.57	2.05	0.44	1.65	0.77
4	714	5	716	1.64	0.55	0.81	0.64	1.28	0.40
5	750	7	748	1.86	0.54	−0.49	0.72	−1.03	0.45
6	2210	14	2212	1.30	0.52	−0.47	0.70	−0.33	0.60
7	790	10	1217d	−2.93	1.11	−3.95	0.80	−5.61	0.61
8	895	8	900	0.43	1.28	−1.98	0.84	−3.61	0.92
9	1377	11	1363	−1.58	1.00	−2.05	0.84	−1.21	1.29
10	1487	12	1484	−0.09	0.99	−0.64	1.27	0.12	0.99
11	2250	15	2240	1.92	0.60	0.84	0.80	0.95	1.39
12	2535	18	2511	−1.90	1.43	2.48	1.94	−0.52.	1.84

	[B⁻¹(R_rad) − B⁻¹(R_V)]a

Band	abs (°C)	rel (°C)b
1	1.3	4.6
2	3.2	3.1
3	2.8	1.6
4	1.7	1.4
5	0.3	0.8
6	1.1	0.7
7	—	—
8	—	—
9	0.8	3.1
10	1.9	1.4
11	2.1	2.5
12	—	—

Abstract

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Applied Optics