Bio-optical characteristics of a phytoplankton bloom event off Baja California Peninsula (30–31°N)

Barocio-León, Óscar A.; Millán-Núñez, Roberto; Santamaría-del-Ángel, Eduardo; González-Silvera, Adriana; Trees, Charles C.; Orellana-Cepeda, Elizabeth

doi:10.1016/j.csr.2007.12.002

Cited by 8 publications

(2 citation statements)

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“…For these samples the 95 per cent quantile value of a* p (676) turns out to be 0.0412 m 2 (mg Chl-a) 21 . Therefore we take a m (676) ¼ 0.0412 (mg Chl-a)m 22 , and we note that this saturating value of chlorophyll-normalized absorption is consistent with the in situ data reported by Bricaud et al [28] and Barocio-Leon et al [27].…”

Section: Specific Absorption Coefficient Of Chlorophyll a A* Csupporting

confidence: 86%

“…In field samples [9,27], especially at low chlorophyll concentrations, a* p (l) sometimes appears to be greater than 0.028 m 2 (mg Chl-a) 21 , the maximum value for a* c (l) reported from laboratory cultures, suggesting that the absorption by pigments other than chlorophyll a may not always be negligible at 676 nm. Under those circumstances, the total phytoplankton absorption a p (l) at any wavelength l can be expressed as a p ðlÞ ¼ a c ðlÞ þ a u ðlÞ;…”

Section: Specific Absorption Coefficient Of Chlorophyll a A* Cmentioning

confidence: 88%

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Retrieval of phytoplankton size from bio-optical measurements: theory and applications

Roy

Sathyendranath

Platt

2010

J. R. Soc. Interface.

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The absorption coefficient of a substance distributed as discrete particles in suspension is less than that of the same material dissolved uniformly in a medium-a phenomenon commonly referred to as the flattening effect. The decrease in the absorption coefficient owing to flattening effect depends on the concentration of the absorbing pigment inside the particle, the specific absorption coefficient of the pigment within the particle, and on the diameter of the particle, if the particles are assumed to be spherical. For phytoplankton cells in the ocean, with diameters ranging from less than 1 mm to more than 100 mm, the flattening effect is variable, and sometimes pronounced, as has been well documented in the literature. Here, we demonstrate how the in vivo absorption coefficient of phytoplankton cells per unit concentration of its major pigment, chlorophyll a, can be used to determine the average cell size of the phytoplankton population. Sensitivity analyses are carried out to evaluate the errors in the estimated diameter owing to potential errors in the model assumptions. Cell sizes computed for field samples using the model are compared qualitatively with indirect estimates of size classes derived from high performance liquid chromatography data. Also, the results are compared quantitatively against measurements of cell size in laboratory cultures. The method developed is easy-to-apply as an operational tool for in situ observations, and has the potential for application to remote sensing of ocean colour data.

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