Polarization discrimination fluorescence retrieval from reflectance spectra of algae in seawater: Comparison of multicomponent Mie scattering and polarized radiative transfer models with laboratory and field tests

A. Gilerson; M. Oo; J. Chowdhary; B.M. Gross; F. Moshary; S. A. Ahmed

doi:10.1117/12.627723

19 October 2005 Polarization discrimination fluorescence retrieval from reflectance spectra of algae in seawater: comparison of multicomponent Mie scattering and polarized radiative transfer models with laboratory and field tests

A. Gilerson, M. Oo, J. Chowdhary, B.M. Gross, F. Moshary, S. A. Ahmed

Author Affiliations +

Proceedings Volume 5977, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2005; 597708 (2005) https://doi.org/10.1117/12.627723
Event: SPIE Remote Sensing, 2005, Bruges, Belgium

Abstract

Previously, it was shown that it is possible to separate the elastic scattering from the chlorophyll fluorescence signal using a polarization discrimination technique. The separation procedure depends however fundamentally on the degree of polarization of the water leaving radiance. In this paper, we compare polarization effects and efficiency of the fluorescence retrieval by simulating the total and polarized reflectance of waterleaving radiances originating from elastic scattering in case 1 and case 2 waters using radiative transfer and multiple component Mie scattering programs. This is done by superimposing upon these reflectances the contribution of known fluorescence spectra, and by using our polarization discrimination procedure to invert the resulting data back into fluorescence spectra. It is shown that a Mie scattering code which does not take into account multiple scattering effects can strongly overestimate the degree of polarization for case 1 and case 2 waters as well as reflectances in the green part of the spectra. Making use of these results we propose and evaluate an improvement for the traditional height over baseline fluorescence extraction method which strongly overestimates fluorescence value for case 2 waters. For our approach we use inverse absorption spectra of water and chlorophyll a scaled up and fitted to the reflectance spectra in the red and near IR bands with the subsequent retrieval of the fluorescence spectrum and chlorophyll a concentration. Results and potential of this approach are discussed.

Citation Download Citation

A. Gilerson, M. Oo, J. Chowdhary, B.M. Gross, F. Moshary, and S. A. Ahmed "Polarization discrimination fluorescence retrieval from reflectance spectra of algae in seawater: comparison of multicomponent Mie scattering and polarized radiative transfer models with laboratory and field tests", Proc. SPIE 5977, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2005, 597708 (19 October 2005); https://doi.org/10.1117/12.627723

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available