Analytic Jacobians for ocean color retrieval: linearization of the coupled atmosphere-ocean discrete ordinate model

Robert J. D. Spurr; Knut H. Stamnes; Hans Arthur Eide; Wei Li; Jakob J. Stamnes

doi:10.1117/12.577855

20 January 2005 Analytic Jacobians for ocean color retrieval: linearization of the coupled atmosphere-ocean discrete ordinate model

Robert J. D. Spurr, Knut H. Stamnes, Hans Arthur Eide, Wei Li, Jakob J. Stamnes

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Proceedings Volume 5656, Active and Passive Remote Sensing of the Oceans; (2005) https://doi.org/10.1117/12.577855
Event: Fourth International Asia-Pacific Environmental Remote Sensing Symposium 2004: Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2004, Honolulu, Hawai'i, United States

Abstract

Recent work has shown the need for accurate treatment of radiative transfer in ocean color retrieval. The plane-parallel coupled atmosphere-ocean discrete ordinate model CAO-DISORT has been used to investigate the validity of current approximative inverse methods and to study new techniques for improved ocean color retrieval. In this paper we show that CAO-DISORT is fully differentiable with respect to its input optical properties, so that we can define analytic Jacobians with respect to any profile element in the atmosphere and ocean. A single call to the linearized model will produce radiances and Jacobians at arbitrary optical depth and viewing geometry in either medium. The model also has a pseudo-spherical treatment for solar beam attenuation in a curved atmosphere. The linearized model can be used directly in iterative least-squares retrievals requiring forward model simulations of backscatter measurements and their parameter derivatives; there is no need for approximations involving an atmospheric correction. We demonstrate the model's new capability by performing closed-loop least squares fitting to simultaneously retrieve the aerosol optical thickness and marine chlorophyll concentration from a set of 6 synthetic measurements at SeaWifs wavelengths.

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Robert J. D. Spurr, Knut H. Stamnes, Hans Arthur Eide, Wei Li, and Jakob J. Stamnes "Analytic Jacobians for ocean color retrieval: linearization of the coupled atmosphere-ocean discrete ordinate model", Proc. SPIE 5656, Active and Passive Remote Sensing of the Oceans, (20 January 2005); https://doi.org/10.1117/12.577855

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KEYWORDS

Atmospheric modeling

Aerosols

Ocean optics

Water

Coastal modeling

Atmospheric particles

Scattering

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