Observations of reflectance distribution around sunglint from a coastal ocean platform

Wenying Su; Thomas P. Charlock; Ken Rutledge

doi:10.1364/AO.41.007369

Applied Optics
Vol. 41,
Issue 35,
pp. 7369-7383
(2002)
•https://doi.org/10.1364/AO.41.007369

Observations of reflectance distribution around sunglint from a coastal ocean platform

Wenying Su, Thomas P. Charlock, and Ken Rutledge

Not Accessible

Your library or personal account may give you access

Get PDF
Email
Share
Get Citation
Copy Citation Text
Wenying Su, Thomas P. Charlock, and Ken Rutledge, "Observations of reflectance distribution around sunglint from a coastal ocean platform," Appl. Opt. 41, 7369-7383 (2002)

Export Citation
- BibTex
- Endnote (RIS)
- HTML
- Plain Text
Citation alert
Save article

Abstract

A scanning spectral photometer is deployed on a rigid coastal ocean platform to measure upwelling solar radiances from the sea surface at nine elevation angles spanning 150° of azimuth. Measured radiance distributions at 500 nm wavelength have been compared with traditional model simulations employing the Cox and Munk distribution of wave slopes. The model captures the general features of the observed angular reflectance distributions, but: (a) the observed peak value of sunglint near the specular direction is larger than simulated, except for a very calm sea; the model-measurement differences increase with wind speed and are largest for low solar elevation; (b) the observed sunglint is wider than simulated. In contrast to some previous studies, our results do not show a clear dependence of the mean square sea-surface slope on stability (air-sea temperature difference).

Full Article | PDF Article

More Like This

Rough ocean surface and sunglint region characteristics

Cesar Monzon, Donald W. Forester, Richard Burkhart, and Jim Bellemare
Appl. Opt. 45(27) 7089-7096 (2006)

Analytical solution of radiative transfer in the coupled atmosphere-ocean system with a rough surface

Zhonghai Jin, Thomas P. Charlock, Ken Rutledge, Knut Stamnes, and Yingjian Wang
Appl. Opt. 45(28) 7443-7455 (2006)

Improving the standard protocol for above-water reflectance measurements: 1. Estimating effective wind speed from angular variation of sunglint

Clémence Goyens and Kevin Ruddick
Appl. Opt. 62(10) 2442-2455 (2023)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (12)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (13)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Elevation Angle	Distance (m)	Diameter (m)
2	663.35	265.58
12	108.98	8.98
22	57.33	2.82
32	37.07	1.42
42	25.73	0.89
52	18.10	0.65
62	12.32	0.52
72	7.53	0.45
90	0.00	0.40

Wind Speed (m/s)	Ref(σ_cm ²)/ Ref(2 × σ_cm ²)			Ref(σ_cm ²)/ Ref(σ_cm ²/2)
	Solar Zenith Angle			Solar Zenith Angle
	58°	68°	78°	58°	68°	78°
0.5	1.93	1.25	0.40	0.53	0.83	5.67
2	1.95	1.60	0.74	0.52	0.76	2.58
4	1.94	1.73	1.05	0.52	0.65	1.61
6	1.94	1.80	1.24	0.52	0.61	1.23
8	1.90	1.82	1.42	0.52	0.58	1.06
10	1.88	1.86	1.46	0.52	0.57	0.87
12	1.85	1.88	1.55	0.52	0.56	0.82
14	1.88	1.86	1.59	0.53	0.55	0.78

DOY-Time	SZA	Wind Speed	Maximum Reflectance	RM	Average RM
Elevation = 12
11-1400	73.7	3.7	10.0	2.04	2.05
11-1330	78.2	4.8	13.1	2.06
6-1330	78.4	5.1	9.78	1.40	2.12
6-1400	74.0	6.1	6.20	1.77
10-1330	78.3	6.1	10.05	1.64
10-1400	73.8	6.4	7.00	1.72
13-1400	73.6	6.7	6.52	4.09
13-1330	78.1	7.1	7.80	3.30	3.30
Elevation = 22
10-1930	67.4	3.7	5.71	1.31	1.28
11-1430	69.7	4.0	4.33	1.25
11-1530	63.2	4.0	2.77	1.29
10-1900	64.2	4.6	4.49	1.25
11-1500	66.1	5.4	2.88	1.49	1.40
6-1500	66.5	6.1	2.35	1.22
6-1530	63.6	6.4	2.29	1.46
6-1430	70.0	6.5	3.35	1.34
10-1430	69.8	6.8	3.12	1.26
10-1500	66.2	6.8	2.27	1.25
10-1530	63.3	6.8	2.26	1.41
13-1430	69.5	6.8	3.03	1.84
13-1500	65.9	7.0	2.41	2.08	2.12
13-1930	66.8	7.2	3.73	2.02
13-1900	63.7	7.5	4.36	2.59
13-1530	62.9	8.1	1.75	1.78
Elevation = 32
11-1730	58.8	0.6	3.80	0.74	0.76
11-1800	59.8	0.8	3.16	0.78
11-1830	61.6	1.6	2.95	1.29	1.17
11-1700	58.6	2.9	1.48	1.04
6-1700	59.3	4.9	1.37	1.23
11-1630	59.3	4.9	1.69	1.58
6-1830	62.4	4.1	1.40	0.95	1.13
10-1800	59.9	4.6	1.39	0.88
6-1800	60.6	4.6	1.55	1.16
11-1600	60.9	4.6	1.48	1.29
10-1730	58.9	4.8	1.16	0.96
10-1700	58.8	4.9	1.13	1.02
6-1730	59.5	5.0	1.05	0.99	1.22
6-1630	60.0	5.1	1.31	1.27
6-1600	61.4	5.4	1.05	1.03
10-1830	61.7	5.4	1.77	1.42
10-1630	59.5	5.8	1.15	1.18
13-1700	58.3	6.8	0.93	1.41
13-1730	58.4	7.4	0.87	1.36	1.42
13-1630	59.0	7.8	0.81	1.37
13-1800	59.4	8.2	1.19	1.69
13-1830	61.2	8.2	1.04	1.44
13-1600	60.6	8.3	0.74	1.25

Elevation Angle	Distance (m)	Diameter (m)
2	663.35	265.58
12	108.98	8.98
22	57.33	2.82
32	37.07	1.42
42	25.73	0.89
52	18.10	0.65
62	12.32	0.52
72	7.53	0.45
90	0.00	0.40

Wind Speed (m/s)	Ref(σ_cm ²)/ Ref(2 × σ_cm ²)			Ref(σ_cm ²)/ Ref(σ_cm ²/2)
	Solar Zenith Angle			Solar Zenith Angle
	58°	68°	78°	58°	68°	78°
0.5	1.93	1.25	0.40	0.53	0.83	5.67
2	1.95	1.60	0.74	0.52	0.76	2.58
4	1.94	1.73	1.05	0.52	0.65	1.61
6	1.94	1.80	1.24	0.52	0.61	1.23
8	1.90	1.82	1.42	0.52	0.58	1.06
10	1.88	1.86	1.46	0.52	0.57	0.87
12	1.85	1.88	1.55	0.52	0.56	0.82
14	1.88	1.86	1.59	0.53	0.55	0.78

Abstract

Cited By

Figures (12)

Tables (3)

Equations (13)

Applied Optics