In situ and remote-sensed chlorophyll fluorescence as indicator of the physiological state of phytoplankton near the Isles Kerguelen (Southern Ocean)
2008
Sligting, Merijn, | Wernand, Marcel R., | Woerd, Hendrik J. van der, | Timmermans, Klaas R., | Uitz, Julia, | Baar, Hein J.W. de,
Shipboard and remote-sensed Chlorophyllfluorescence were determined in the natural phytoplanktonassemblage above the iron-enriched Kerguelen Plateau andthe adjacent high-nutrient, low-Chlorophyll open SouthernOcean. The variance between fluorescence yield and photosyntheticefficiency was determined in combination withChlorophyll a concentrations, irradiance and phytoplanktonspecies distribution. A co-variance between thefluorescence measurements would allow the refinement ofremote-sensing primary production algorithms. Distinctdifferences were found in photosynthetic efficiency andwater-leaving fluorescence, with relatively high values forthe Kerguelen Plateau and low values in the open ocean,reflecting the differences in Chlorophyll a concentrations.The co-variance of the fluorescence properties suggestedthat remote-sensed fluorescence measurements could beused to infer differences in the physiological state of thephytoplankton, hence primary production. Fluorescenceyield, however, did not show the differences in the researcharea, most likely due to the low signal and the diurnalvariation in water-leaving fluorescence.
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