Photosynthetically active radiation during POLARSTERN cruise ANT-XVIII/2 ...

• Main Author: Riebesell, Ulf
• Format: Dataset
• Language: English
• Published: PANGAEA 2009
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; DEPTH, water; Type; Diffuse attenuation coefficient, downward; Diffuse attenuation coefficient, downward, standard deviation; Radiation, photosynthetically active; Depth of the euphotic zone; Comment; CTD/Rosette; Multiple investigations; Quantum Cosine Deep Profiling Sensor QCD-900L; Calculated; ANT-XVIII/2; Polarstern; European Iron Enrichment Experiment in the Southern Ocean EisenEx; Gonzalez; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.727593; https://doi.pangaea.de/10.1594/PANGAEA.727593

The following data are based on PAR measurements made with the Biospherical Instruments QCD-900L Quantum Cosine Deep Profiling Sensor of Santiago Gonzalez. The sensor was fixed to the frame of the bottle sampler from cast 9 onwards. 1 meter mean values of the downcasts were made available by Volker Strass. All calculations leading to the data below were made by Frank Gervais. Missing casts were made during the night or did not give reliable results.The vertical attenuation coefficient (kd) of photosynthetically active radiation (PAR) was calculated as the slope of an ln-plot of PAR versus depth for the water layer between 10 and 40 m. (Calculations were also done for deeper water layers.) From the resulting regression parameters the subsurface PAR (PAR 0m) was calculated. The depth of the euphotic zone (Zeu) is the depth were PAR was 1 % of subsurface PAR.Below the table with all CTD casts there is a table comprising only the data for the Bio-stations (which might be most interesting for most of you). These ...