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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 19 — Sep. 10, 2012
  • pp: 21532–21551

Particulate optical scattering coefficients along an Atlantic Meridional Transect

G. Dall’Olmo, E. Boss, M.J. Behrenfeld, and T.K. Westberry  »View Author Affiliations


Optics Express, Vol. 20, Issue 19, pp. 21532-21551 (2012)
http://dx.doi.org/10.1364/OE.20.021532


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Abstract

The particulate optical backscattering coefficient (bbp) is a fundamental optical property that allows monitoring of marine suspended particles both in situ and from space. Backscattering measurements in the open ocean are still scarce, however, especially in oligotrophic regions. Consequently, uncertainties remain in bbp parameterizations as well as in satellite estimates of bbp. In an effort to reduce these uncertainties, we present and analyze a dataset collected in surface waters during the 19th Atlantic Meridional Transect. Results show that the relationship between particulate beam-attenuation coefficient (cp) and chlorophyll-a concentration was consistent with published bio-optical models. In contrast, the particulate backscattering per unit of chlorophyll-a and per unit of cp were higher than in previous studies employing the same sampling methodology. These anomalies could be due to a bias smaller than the current uncertainties in bbp. If that was the case, then the AMT19 dataset would confirm that bbp:cp is remarkably constant over the surface open ocean. A second-order decoupling between bbp and cp was, however, evident in the spectral slopes of these coefficients, as well as during diel cycles. Overall, these results emphasize the current difficulties in obtaining accurate bbp measurements in the oligotrophic ocean and suggest that, to first order, bbp and cp are coupled in the surface open ocean, but they are also affected by other geographical and temporal variations.

© 2012 OSA

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.4458) Atmospheric and oceanic optics : Oceanic scattering
(010.1350) Atmospheric and oceanic optics : Backscattering

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: June 20, 2012
Revised Manuscript: August 31, 2012
Manuscript Accepted: August 31, 2012
Published: September 5, 2012

Virtual Issues
Vol. 7, Iss. 11 Virtual Journal for Biomedical Optics

Citation
G. Dall’Olmo, E. Boss, M.J. Behrenfeld, and T.K. Westberry, "Particulate optical scattering coefficients along an Atlantic Meridional Transect," Opt. Express 20, 21532-21551 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-19-21532


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