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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 19 — Sep. 10, 2012
  • pp: 20920–20933

Under the hood of satellite empirical chlorophyll a algorithms: revealing the dependencies of maximum band ratio algorithms on inherent optical properties

Michael J. Sauer, C. S. Roesler, P. J. Werdell, and A. Barnard  »View Author Affiliations


Optics Express, Vol. 20, Issue 19, pp. 20920-20933 (2012)
http://dx.doi.org/10.1364/OE.20.020920


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Abstract

Empirically-based satellite estimates of chlorophyll a [Chl] (e.g. OC3) are an important indicator of phytoplankton biomass. To correctly interpret [Chl] variability, estimates must be accurate and sources of algorithm errors known. While the underlying assumptions of band ratio algorithms such as OC3 have been tacitly hypothesized (i.e. CDOM and phytoplankton absorption covary), the influence of component absorption and scattering on the shape of the algorithm and estimated [Chl] error has yet to be explicitly revealed. We utilized the NOMAD bio-optical data set to examine variations between satellite estimated [Chl] and in situ values. We partitioned the variability into (a) signal contamination and (b) natural phytoplankton variability (variability in chlorophyll-specific phytoplankton absorption). Not surprisingly, the OC3 best-fit curve resulted from a balance between these two different sources of variation confirming the bias by detrital absorption on global scale. Unlike previous descriptions of empirical [Chl] algorithms, our study (a) quantified the mean detrital:phytoplankton absorption as ~1:1in the global NOMAD data set, and (b) removed detrital (CDOM + non-algal particle) absorption in radiative transfer models directly showing that the scale of the remaining variability in the band ratio algorithm was dominated by phytoplankton absorption cross section.

© 2012 OSA

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(280.4991) Remote sensing and sensors : Passive remote sensing
(010.1030) Atmospheric and oceanic optics : Absorption
(010.1350) Atmospheric and oceanic optics : Backscattering
(010.1690) Atmospheric and oceanic optics : Color

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: February 22, 2012
Revised Manuscript: July 11, 2012
Manuscript Accepted: July 11, 2012
Published: August 29, 2012

Citation
Michael J. Sauer, C. S. Roesler, P. J. Werdell, and A. Barnard, "Under the hood of satellite empirical chlorophyll a algorithms: revealing the dependencies of maximum band ratio algorithms on inherent optical properties," Opt. Express 20, 20920-20933 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-19-20920


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