Abstract

The self-shading measurement error of the upwelling irradiance caused by the presence of a typical cylindrical housing of an optical instrument was calculated with the 3-D Monte-Carlo code as a function of the housing dimensions and of the optical parameters of seawater. The resulting values were compared to the self-shading error for a flat disk of the same diameter, originally used to establish self-shading error estimations universally used in marine optics. The results show that the self-shading of upwelling irradiance is underestimated by up to 25% producing a significant underestimation of the measured upwelling irradiance, and therefore reflectance, especially in turbid waters.

© 2004 Optical Society of America

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References

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  1. H.R. Gordon and K. Ding, ???Self-shading of in-water optical instruments,??? Limnol. Oceanogr. 37, 491-500 (1992).
    [CrossRef]
  2. G. Zibordi and G. M. Ferrari, ???Instrument self-shading in underwater optical measurements:experimental data,??? Appl. Opt. 34, 2750???2754 (1995).
    [CrossRef] [PubMed]
  3. E. Aas and B. Korsbo, ???Self-shading effect by radiance meters on upward radiance observed in coastal waters,??? Limnol. Oceanogr. 42, 968???974 (1997).
    [CrossRef]
  4. J. Piskozub, A.R. Weeks, J.N. Schwarz, and I.S. Robinson, ???Self-shading of upwelling irradiance for an instrument with sensors on a sidearm,??? Appl. Opt. 39, 1872-1878 (2000).
    [CrossRef]
  5. R.A. Leathers, T.V. Downes and C.D Mobley, ???Self-shading correction for upwelling sea-surface radiance measurements made with buoyed instruments,??? Opt. Express 8, 561-570 (2001), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-8-10-561">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-8-10-561</a.>
    [CrossRef] [PubMed]
  6. J. Piskozub, ???Effects of surface waves and sea-bottom on self-shading of in-water optical instruments,??? in Ocean Optics XII, Proc. SPIE 2258, 300-308 (1994).
  7. J. Piskozub, ???Influence of instrument casing shape on self-shading of in-water radiation,??? paper presented at Ocean Optics XIV Conference, Kailua-Kona, Hawaii, USA, Nov 10-13 1998.
  8. J. Piskozub, P.J. Flatau and J.R.V. Zaneveld, ???Monte Carlo study of the scattering error of a quartz reflective absorption tube,??? J. Atmos. Ocean. Technol. 18, 438-445 (2001).
    [CrossRef]
  9. D. Stramski and J. Piskozub, ???Estimation of scattering error in spectrophotometric measurements of light absorption by aquatic particles from 3-D radiative transfer simulations,??? Appl. Opt. 42, 3634-3646 (2003).
    [CrossRef] [PubMed]
  10. J. Piskozub, ???Effect of ship shadow on in-water irradiance measurements,??? Oceanologia 46, 103-112 (2004).
  11. T.J. Petzold, ???Volume scattering functions for selected ocean waters,??? SIO Ref. 72-78, Scripps Institute of Oceanography, U. California, San Diego (1972).
  12. C. Cox and W. H. Munk, ???Slopes of the sea surface deduced from photographs of sun glitter,??? Scripps. Inst. Oceanogr. Bul. 6, 401-488 (1956).

Appl. Opt. (3)

J. Atmos. Ocean. Technol. (1)

J. Piskozub, P.J. Flatau and J.R.V. Zaneveld, ???Monte Carlo study of the scattering error of a quartz reflective absorption tube,??? J. Atmos. Ocean. Technol. 18, 438-445 (2001).
[CrossRef]

Limnol. Oceanogr. (2)

H.R. Gordon and K. Ding, ???Self-shading of in-water optical instruments,??? Limnol. Oceanogr. 37, 491-500 (1992).
[CrossRef]

E. Aas and B. Korsbo, ???Self-shading effect by radiance meters on upward radiance observed in coastal waters,??? Limnol. Oceanogr. 42, 968???974 (1997).
[CrossRef]

Ocean Optics XII, Proc. SPIE (1)

J. Piskozub, ???Effects of surface waves and sea-bottom on self-shading of in-water optical instruments,??? in Ocean Optics XII, Proc. SPIE 2258, 300-308 (1994).

Ocean Optics XIV Conference (1)

J. Piskozub, ???Influence of instrument casing shape on self-shading of in-water radiation,??? paper presented at Ocean Optics XIV Conference, Kailua-Kona, Hawaii, USA, Nov 10-13 1998.

Oceanologia (1)

J. Piskozub, ???Effect of ship shadow on in-water irradiance measurements,??? Oceanologia 46, 103-112 (2004).

Opt. Express (1)

Scripps. Inst. Oceanogr. Bul. (1)

C. Cox and W. H. Munk, ???Slopes of the sea surface deduced from photographs of sun glitter,??? Scripps. Inst. Oceanogr. Bul. 6, 401-488 (1956).

SIO Ref. (1)

T.J. Petzold, ???Volume scattering functions for selected ocean waters,??? SIO Ref. 72-78, Scripps Institute of Oceanography, U. California, San Diego (1972).

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Figures (6)

Fig. 1.
Fig. 1.

The self-shading error dependance on absorption a for instruments with two radii, a flat disk and cylindrical shape (b=0.3 m-1 see text for other input data details)

Fig 2.
Fig 2.

The self shading error dependance on photon survival ratio ω0 for instrument with a flat disk and cylindrical shape (c=0.5 m-1 see text for other input data details)

Fig. 3.
Fig. 3.

The self-shading error of upwelling vector irradiance as a function of the sun zenith angle for flat disk shading and cylindrical housing of two radii (c=0.6 m-1, ω 0=0.8).

Fig. 4.
Fig. 4.

The self-shading error of upwelling vector irradiance as a function of the cylindrical housing height h, for two instrument radii and two values of attenuation c (ω0 =0.8).

Fig. 5.
Fig. 5.

The self-shading error of upwelling vector irradiance as a function of the instrument radius r, for a flat disk shading and a cylindrical housing where height h=1 m (c=0.6 m-1, ω0 =0.8).

Fig. 6.
Fig. 6.

The self shading error of upwelling vector irradiance as a function of instrument height for cylindrical housing of a constant volume V=πr2 h (c=0.6 m-1, ω0 =0.8)

Equations (1)

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δ ( E u ) E u = A r a

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