Hyperspectral absorption coefficient measurements during the cruise HE516 with RV HEINCKE

• Main Authors: Wollschläger, Jochen, Voß, Daniela, Zielinski, Oliver
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: absorption coefficient; 400 nm; 402 nm; 404 nm; 406 nm; 408 nm; 410 nm; 412 nm; 414 nm; 416 nm; 418 nm; 420 nm; 422 nm; 424 nm; 426 nm; 428 nm; 430 nm; 432 nm; 434 nm; 436 nm; 438 nm; 440 nm; 442 nm; 444 nm; 446 nm; Alfred Wegener Institute
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.928542; https://doi.org/10.1594/PANGAEA.928542

This dataset was collected during the cruise HE516 (17.07.2018 - 16.08.2018) with RV HEINCKE from Bremerhaven, Germany to Bremerhaven, Germany. It contains absorption coefficients [m-1] from water constituents in a range of 400 to 710 nm (2 nm resolution). In total, 75 stations have been sampled. Where the water column was mixed, one sample was taken from approx. 5 m. In case of stratified water or chlorophyll-a maxima present, additional samples from greater depths were taken. The water samples were fractionated by filtration to investigate the absorption with respect to size classes. Thus, data from unfiltered samples are available as well as data from water that passed a 20 µm, 2 µm, and 0.2 µm filter, respectively (denoted as a_tot, a_20µm, a_2µm, and a_cdom). The absorption coefficient measurements were performed with a point-source integrating-cavity absorption meter (PSICAM) with a sample volume of approx. 400 ml. The specifications of the PSICAM, relevant publications, information regarding the measurements, calibration of the instrument, and data correction are provided in a separate document. Raw data are available on request from the authors. Supplementary Information attached. Chief Scientist of HE516: Dr. Bernd Krock, Alfred-Wegener-Institute, Helmholtz Centre for Polar and Marine Research. Work related to Coastal ocean darkening - Light availability in the past and future marine environment (COD).