Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'ee' buoy deployed during MOSAiC in the Sea Ice Ridge Observatory area ...

• Main Authors: Anderson, Philip, Berge, Jørgen, Granskog, Mats A, Divine, Dmitry V, Katlein, Christian, Itkin, Polona, Raphael, Ian, Johnsen, Geir, Vogedes, Daniel, Kopec, Tomasz, Zolich, Artur, Geoffroy, Maxime, Cottier, Finlo, De La Torre, Pedro R
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Autonomous buoy; Light; optical; sub-surface; Buoy, drifting; PS122/2; Polarstern; Arctic Ocean ecosystems - Applied technology, Biological interactions and Consequences in an era of abrupt climate change ArcticABCDevelopment; Arctic Research Icebreaker Consortium A strategy for meeting the needs for marine-based research in the Arctic ARICE; Multidisciplinary drifting Observatory for the Study of Arctic Climate MOSAiC; Ridges - Safe HAVens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic OCean HAVOC; Arctic; Arctic Ocean; Climate change; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.928495; https://doi.pangaea.de/10.1594/PANGAEA.928495

Three ice-tethered / floating systems measuring sub - sea-ice Photosynthetic Active Radiation (PAR) were deployed within the MOSAiC ice camp from February 2020, and recorded hourly data through to later summer 2020. These Optical Chain And Logger (OptiCAL) systems capture PAR-like data at 12 logarithmically-spaced levels down to 50 m depth, and, along with positional data, transmit these data hourly via Iridium. The PAR sensors have a wide dynamic range, able to detect PAR from 5x10⁻⁵ µMol s⁻¹ m⁻² to 100 µMol s⁻¹ m⁻² and thereby graph a wide range of light behaviour from winter to summer and from surface to depth. Sampling at the 12 levels is accomplished by resin-containment 'nodes' located along a power and communication cable that hangs vertically from the underside of the surface spar-buoy. The nodes are at nominal depths of 1, 2, 3, 4, 5, 6, 7, 9, 14, 21, 32, and 50m. Each node has six 'PAR' sensors, three detecting downwelling light and three upwelling light. Two of each set of three sensor sets have ...