Instruments and Methods
Head of the group
Dr. Thomas Badewien
(Deputy of the Professorship Marine Sensor Systems)
Instruments and Methods
Instruments | Aim |
Hyperspectral light profiler | Hyperspectral measurement of the underwater light field |
Radiometers | Measuring near surface remote sensing reflectance in hyperspectral resolution |
Optical Nitrate sensors | High frequent measurement of nitrate based on the absorption properties of the water in the UV-spectrum |
Bio-optical sensor package | In situ determination of the inherent optical properties of the water (attenuation, absorption, (back)scattering) along with fluorescence-based chl-a and CDOM estimations |
CTD rosette with 24x20-L Niskin bottles | Determination of the vertical hydrographic structure of the water column and providing large volumes of sample water |
Mid-size ROV Falcon (Saab) | Visual inspection and manipulation of underwater objects |
Pocket FerryBox | Continuous measurements of oceanographic and biogeochemical variables in the upper water column |
FlowCam 8400 | Imaging of particles from approx. 2 to 1000 µm |
ADCP (Acoustic Doppler Current Profiler) | Measurement of underwater currents and acoustic backscatter |
Radar | Determination of wave field and wave height |
Surface Drifter | Determination of surface currents based on GPS tracking |
Secchi-Disc / Forel-Ule-Skala | Estimation of water transparency and –color |
Laboratory spectrophotometers and -fluorometers | Hyperspectral determination of absorption coefficients on water samples, creation of fluorescence excitation-emission-matrices |
PSICAM (point-source integrating-cavity absorption meter) | Laboratory determination of hyperspectral absorption coefficients in a water sample |
BGC-Argo floats | Determination of ocean currents and vertical structure of the water column in terms of hydrographic and biogeochemical variables (including underwater light) in remote regions |
Flow cytometer and cell sorter | Determination of abundances of virus like particles, microbes and (phyto-) plankton and their distinct scatter characteristics. Size limited:(≤50µm). Sorting of distinct populations from water samples. |
Methods | Aim |
PARAFAC | Evaluation of excitation-emission spectra for the different fluorescing compounds |
HydroLight | Modeling of underwater light field based on radiative transfer equations |
ROV-Simulation | Training software for ROV deployments |
Optical nitrate determination | Refinement of algorithms that relate UV-absorption to nitrate concentration in various water types |
Lab-based sensor calibration | Various methods to validate and calibrate in situ sensors (e.g. fluorometric chl-a determination, Winkler titration for oxygen concentration, gravimetric suspended matter determination) |