In the Curonian Lagoon a two-day field campaign was performed from 22 to 23 July 2021 to collect water samples and radiometric measurements, synchronous with Sentinel-2, Sentinel-3 and PRISMA satellite acquisitions.
Continuous radiometric measurements from TriOS Hyperspectral Radiometer (University of Stirling) and ROX (CNR) instruments were collected along two different transects into the Lagoon and on a fixed position on a long jetty, respectively. These measure the reflectance of the water which gives an indication of water colour which can be associated with features such as phytoplankton biomass, suspended solids and dissolved organic matter concentration, thus giving an insight into the water quality. These measurements will be used to validate the observations from the synchronous satellite acquisitions.
Above left: TriOS spectroradiometer installed on a boat to collect reflectance measurements of the Curonian Lagoon water. Above right: Hyperspectral ROX spectroradiometer measuring water reflectance every 5 minutes.
The Satlantic and WISP-3 (CNR) instruments were also used for radiometric measurements in different sampling stations inside and outside the water column. Water samples were collected for chlorophyll-a, absorbance, total suspended matter, coloured dissolved inorganic matter, turbidity and phycocyanin determination. The samples collected will be further analysed in the laboratory at Klaipeda University.
Martinas Buscas from Klaipeda University collecting the spectral signature with a hyperspectral Satlantic instrument.