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De in zeewater aanwezige zwevende materie zoals sedimenten, fytoplankton, zooplankton, bacteriën, virussen en detritus, worden collectief "suspended particulate matter" (SPM) genoemd. In kustwateren varieert SPM sterk in ruimte en tijd door wind- of getijdenwerking.
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Particles suspended in seawater include sediments, phytoplankton, zooplankton, bacteria, viruses and detritus, and are collectively referred to as suspended particulate matter, SPM. In coastal waters, SPM varies strongly in time and space due to tides and winds. The dry mass concentration of SPM [SPM], can be estimated from optical sensors deployed in situ or from space, allowing to cover large temporal and spatial scales. So called polar-orbiting ocean colour satellites, for example, have been used for mapping of [SPM] on a global scale since the late 1970s with a frequency of one image per day for the North Sea area. This sampling frequency is, however, too low to resolve the strong spatio-temporal variations of [SPM]. This work aims to advance in situ and space-based optical techniques for [SPM] retrieval by investigating the natural variability in the relationship between [SPM] and light scattering by particles and by investigating whether the European geostationary meteorological SEVIRI sensor, which provides imagery every 15 minutes, can be used for the mapping of [SPM] in the southern North Sea.
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