Characterization and absolute calibration of an AERONET-OC radiometer

B. C. Johnson; Giuseppe Zibordi; Steven W. Brown; Michael E. Feinholz; Mikhail G. Sorokin; Mikhail G. Sorokin; Ilya Slutsker; Ilya Slutsker; John T. Woodward; Howard W. Yoon

doi:10.1364/AO.419766

Applied Optics
Vol. 60,
Issue 12,
pp. 3380-3392
(2021)
•https://doi.org/10.1364/AO.419766

Characterization and absolute calibration of an AERONET-OC radiometer

B. C. Johnson, Giuseppe Zibordi, Steven W. Brown, Michael E. Feinholz, Mikhail G. Sorokin, Ilya Slutsker, John T. Woodward, and Howard W. Yoon

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B. C. Johnson, Giuseppe Zibordi, Steven W. Brown, Michael E. Feinholz, Mikhail G. Sorokin, Ilya Slutsker, John T. Woodward, and Howard W. Yoon, "Characterization and absolute calibration of an AERONET-OC radiometer," Appl. Opt. 60, 3380-3392 (2021)

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- Instrumentation and Measurements
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About this Article
History
- Original Manuscript: January 13, 2021
- Revised Manuscript: March 8, 2021
- Manuscript Accepted: March 10, 2021
- Published: April 15, 2021

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Abstract

The Ocean Color component of the global Aerosol Robotic Network (AERONET-OC) utilizes CE-318 sun photometers modified for above-water radiometry from fixed structures such as oil rigs, lighthouses, and service platforms. Primarily, AERONET-OC measurements allow determination of the water-leaving radiance required for the validation of ocean color satellite data products. One instrument from the AERONET–OC network, identified as AERONET #080, was studied in this work. A laser-illuminated integrating sphere of known radiance enabled determination of the linearity with flux and absolute radiance responsivity at multiple wavelengths within seven of the AERONET #080 filter bands. We compared the results to calibrations from the AERONET facility at the Goddard Space Flight Center of the National Aeronautics and Space Administration and from the Joint Research Centre of the European Commission. These results agree within the estimated mean comparison uncertainty of 1.88 % ($k = {{2}}$). We also assessed these results using calibrated lamp-illuminated integrating spheres and observed a spectral dependence to the comparison results that is unexplained.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Condition	Si, Open	Si, Closed	Si, Net	Offset or Correction Factor
$S_{i, f l u x} > B_{i n t}$	$S_{i, f l u x} - B_{i n t}$	$B_{i n t}$	$S_{i, f l u x}$ − $2 B_{i n t}$	$+ 2 B_{i n t}$
$S_{i, f l u x} = 2 B_{i n t}$	$B_{i n t}$	$B_{i n t}$	0	$+ 2 B_{i n t}$
$S_{i, f l u x} = B_{i n t}$	0	$B_{i n t}$	$- B_{i n t}$	$+ 2 B_{i n t}$
$S_{i, f l u x} < B_{i n t}$	$- S_{i, f l u x} + B_{i n t}$	$B_{i n t}$	$- S_{i, f l u x}$	Multiply by $- 1$

SPLV Commanded Position	Gain $n$ SPLV	$λ_{b}$ , nm	PRS Band Number	Gain $n$ PRS	Year ASR Measured
1	5	413.2	6	5	2011, 2013
2	5	936	7	5	2011
3	5	489.9	8	5	2011
4	5	550.7	9	5	2011, 2013
5	5	1020	1	4
6	5	870.0	2	4	2011, 2013
7	5	668.2	3	5	2011, 2013
8	5	440.7	4	5	2011, 2013
9	5	530.6	5	5	2011, 2013

Wavelength	Manufacturer Filter $τ (λ)$		NIST, SIRCUS
$λ_{b}$	$λ_{i}$	$Δ λ_{i}$	$λ_{i}$	$Δ λ_{i}$	Application
413.2	413.24	7.93	413.06	8.08	AERONET OC
440.7	440.85	9.76	440.96	9.90	AERONET OC
489.9	489.95	10.4	489.73	10.4	AERONET OC
530.6	530.65	9.45	530.64	9.54	AERONET OC
550.7	550.75	9.82	550.76	9.91	AERONET OC
668.2	668.00	8.40	667.96	8.45	AERONET OC
870.0	869.95	9.60	869.90	9.79	AERONET OC
936	935.93	9.01	934.57	9.09	AERONET
1020.0	1020.2	10.7	NaN	NaN	AERONET OC

$λ_{i}$ , nm	$C_{i}$ , (DN ${c m}^{2}$ sr nm)/µW	$u (C_{i})$ , %
413.06	5790.9	0.27
440.96	7873.2	0.36
489.73	11,321	0.21
530.64	11,918	0.19
550.76	13,075	0.38
667.96	15,923	0.31
869.90	19,804	0.19^a

Condition	Si, Open	Si, Closed	Si, Net	Offset or Correction Factor
$S_{i, f l u x} > B_{i n t}$	$S_{i, f l u x} - B_{i n t}$	$B_{i n t}$	$S_{i, f l u x}$ − $2 B_{i n t}$	$+ 2 B_{i n t}$
$S_{i, f l u x} = 2 B_{i n t}$	$B_{i n t}$	$B_{i n t}$	0	$+ 2 B_{i n t}$
$S_{i, f l u x} = B_{i n t}$	0	$B_{i n t}$	$- B_{i n t}$	$+ 2 B_{i n t}$
$S_{i, f l u x} < B_{i n t}$	$- S_{i, f l u x} + B_{i n t}$	$B_{i n t}$	$- S_{i, f l u x}$	Multiply by $- 1$

Abstract

Data Availability

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Figures (13)

Tables (4)

Equations (7)

Applied Optics