期刊
INTERNATIONAL JOURNAL OF REMOTE SENSING
卷 28, 期 3-4, 页码 497-516出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/01431160600821036
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资金
- Natural Environment Research Council [pml010007, NE/C516079/1, pml010001] Funding Source: researchfish
- NERC [pml010007, pml010001] Funding Source: UKRI
We measured water leaving reflectance, phytoplankton pigments, optical properties and photosynthetic parameters in the southern Benguela ecosystem in October 2002. These data were used to validate MERIS standard products: reflectance (MERIS wavelengths) and Case 1 Chlorophyll- a. In this heterogeneous area, accurate validation required sampling within a few minutes of the satellite overpass. Inter-pigment relationships e. g. Total Chlorophyll (TChla) to Total Pigment (TP) were robust (R-2 similar to 0.99) yet pigment ratios (TChla/TP) were not constant (range 0.44 to 0.62) increasing log-linearly with biomass (R-2 similar to 0.7). Photosynthetic parameters (e. g. Photosynthetic Quantum Efficiency, PQE) and optical ratios (a(676)/a(440)) also increased log-linearly with biomass (R-2 similar to 0.8). PQE, pigment and optical ratios were linearly inter-correlated (R-2 similar to 0.7 to 0.8). From these data we derived the bio-optical traits for several phytoplankton functional types (PFTs): micro-plankton (diatoms and dinoflagellates) had high biomass, pigment ratios and PQE; nano-flagellates had low to intermediate biomass, pigment ratios and PQE; prokaryotes had very low biomass, pigment ratios and PQE. We present MERIS data analysed for PFTs and new products (PQE).
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