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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 20 — Sep. 26, 2011
  • pp: 18927–18944

Fast light calculations for ocean ecosystem and inverse models

Curtis D. Mobley  »View Author Affiliations


Optics Express, Vol. 19, Issue 20, pp. 18927-18944 (2011)
http://dx.doi.org/10.1364/OE.19.018927


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Abstract

Ocean physical-biological-optical ecosystem models can require light calculations at thousands of grid points and time steps. Implicit inverse models that recover ocean absorption and scattering properties from measured light variables can require thousands of solutions of the radiative transfer equation. An extremely fast radiative transfer code, EcoLight-S(ubroutine), has been developed to address these needs. EcoLight-S requires less than one second on a moderately fast computer to compute spectral irradiances over near-ultraviolet to near-infrared wavelengths with errors in the photosyntheically available radiation (PAR) of no more than ten percent throughout the euphotic zone. It is thus possible to replace simple and often inaccurate analytical PAR or spectral irradiance models with more accurate radiative transfer calculations, with very little computational penalty. EcoLight-S is applicable to Case 2 and optically shallow waters for which no analytical light models exist. EcoLight-S also computes upwelling and downwelling plane irradiances, nadir and zenith radiances, and the remote-sensing reflectance. These quantities allow ecosystem predictions to be validated with optical measurements obtained from in-water instruments or remotely sensed imagery.

© 2011 OSA

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.5620) Atmospheric and oceanic optics : Radiative transfer

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: June 29, 2011
Revised Manuscript: August 11, 2011
Manuscript Accepted: August 23, 2011
Published: September 14, 2011

Virtual Issues
Vol. 6, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Curtis D. Mobley, "Fast light calculations for ocean ecosystem and inverse models," Opt. Express 19, 18927-18944 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-20-18927


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References

  1. C. D. Mobley, Light and Water: Radiative Transfer in Natural Waters (Academic, 1994), http://www.curtismobley.com/lightandwater.zip .
  2. C. D. Mobley and L. K. Sundman, HydroLight User’s Guide (Sequoia Scientific, Inc., 2008), http://www.hydrolight.info .
  3. C. D. Mobley and L. K. Sundman, HydroLight Technical Documentation (Sequoia Scientific, Inc., 2008), http://www.hydrolight.info .
  4. C. D. Mobley, EcoLight-S 1.0 User’s Guide and Technical Documentation (Sequoia Scientific, Inc., 2011), http://www.hydrolight.info . [PubMed]
  5. G. R. Fournier and J. L. Forand, “Analytic phase function for ocean water,” in Ocean Optics XII, J. Jaffe, ed., Proc. SPIE2258 (with corrections), 194–201 (1994). [CrossRef]
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  10. C. D. Mobley, “A new IOP model for Case 1 water,” in Ocean Optics Web Book, http://www.oceanopticsbook.info/view/optical_constituents_of_the_ocean/__level_2/a_new_iop_model_for_case_1_water .
  11. C. D. Mobley, L. K. Sundman, W. P. Bissett, and B. Cahill, “Fast and accurate irradiance calculations for ecosystem models,” Biogeosci. Discuss.6, 10625–10662 (2009), http://www.biogeosciences-discuss.net/6/10625/2009/bgd-6-10625-2009.pdf . [CrossRef]
  12. A. F. Shchepetkin and J. C. McWilliams, “The regional ocean modeling system (ROMS): a split-explicit, free-surface, topography-following-coordinate oceanic model,” Ocean Model.9, 347–404 (2005), https://www.myroms.org/wiki/index.php/Documentation_Portal . [CrossRef]
  13. F. Chai, R. C. Dugdale, T.-H. Peng, F. P. Wilkerson, and R. T. Barber, “One dimensional ecosystem model of the equatorial Pacific upwelling system, part I: model development and silicon and nitrogen cycle,” Deep-Sea Res., Part II 49, (13–14), 2713–2745 (2002).
  14. M. Fujii, E. Boss, and F. Chai, “The value of adding optics to ecosystem models: a case study,” Biogeosciences4, 817–835 (2007), http://www.biogeosciences.net/4/817/2007/ . [CrossRef]
  15. F. Chai, “Incorporating optics into physical and ecosystem modeling,” presented at the Gordon Research Conference on Coastal Ocean Modeling, South Hadley, MA, 26 June–1 July, 2011.
  16. E. Rehm, C. D. Mobley, and J. Smart, “Inverting light with constraints,” presented at Ocean Optics XIX, Barga, Italy, 6–10 Oct. 2008, http://staff.washington.edu/erehm/OOXIX-Rehm-final.pdf .

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