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Development and application of an algorithm for detecting Phaeocystis globosa blooms in the Case 2 Southern North Sea waters Astoreca, R.; Rousseau, V.; Ruddick, K.; Knechciak, C.; Van Mol, B.; Parent, J.-Y.; Lancelot, C. (2009). Development and application of an algorithm for detecting Phaeocystis globosa blooms in the Case 2 Southern North Sea waters. J. Plankton Res. 31(3): 287-300. dx.doi.org/10.1093/plankt/fbn116 In: Journal of Plankton Research. Oxford University Press: New York,. ISSN 0142-7873; e-ISSN 1464-3774, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 226108 [ download pdf ]

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Trefwoorden

Absorption (physics) > Light absorption Algal blooms Algorithms Aquatic communities > Plankton > Phytoplankton Chemical compounds > Organic compounds > Carbohydrates > Glycosides > Pigments Data processing Environmental effects > Light effects Mapping Models > Mathematical models Organic compounds > Carbohydrates > Glycosides > Pigments > Photosynthetic pigments > Chlorophylls Remote sensing Water > Sea water Phaeocystis globosa Scherffel, 1899 [WoRMS] ANE, Noordzee [Marine Regions] Marien/Kust

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Auteurs		Top
Astoreca, R. Rousseau, V. Ruddick, K. Knechciak, C.	Van Mol, B. Parent, J.-Y. Lancelot, C.

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Abstract

While mapping algal blooms from space is now well-established, mapping undesirable algal blooms in eutrophicated coastal waters raises further challenge in detecting individual phytoplankton species. In this paper, an algorithm is developed and tested for detecting Phaeocystis globosa blooms in the Southern North Sea. For this purpose, we first measured the light absorption properties of two phytoplankton groups, P. globosa and diatoms, in laboratory-controlled experiments. The main spectral difference between both groups was observed at 467 nm due to the absorption of the pigment chlorophyll c3 only present in P. globosa, suggesting that the absorption at 467 nm can be used to detect this alga in the field. A Phaeocystis-detection algorithm is proposed to retrieve chlorophyll c3 using either total absorption or water-leaving reflectance field data. Application of this algorithm to absorption and reflectance data from Phaeocystis-dominated natural communities shows positive results. Comparison with pigment concentrations and cell counts suggests that the algorithm can flag the presence of P. globosa and provide quantitative information above a chlorophyll c3 threshold of 0.3 mg m-3 equivalent to a P. globosa cell density of 3 × 106 cells L-1. Finally, the possibility of extrapolating this information to remote sensing reflectance data in these turbid waters is evaluated.

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