Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters

The optical chain and logger (OptiCAL) is an autonomous ice-tethered observatory equipped with multiple light sensors for mapping the variation of light with depth. We describe the instrument and present an ensemble calibration for downwelling irradiance EPAR in [µmolm−2s−1]. Results from a long-ter...

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Bibliographic Details
Published in:Applied Optics
Main Authors: Schartmüller, Bernhard, Anderson, Philip, Mckee, David, Connan-Mcginty, Stacey, Kopec, Tomasz p., Daase, Malin, Johnsen, Geir, Berge, Jørgen
Format: Article in Journal/Newspaper
Language:English
Published: 2023
Subjects:
Arctic
Arctic Ocean
ice covered waters
Online Access:https://pure.uhi.ac.uk/en/publications/ae0cfe1f-5e6a-428f-b040-b6b22e363cef
https://doi.org/10.1364/AO.502437
https://pureadmin.uhi.ac.uk/ws/files/49032108/ao-62-31-8308.pdf
https://opg.optica.org/abstract.cfm?URI=ao-62-31-8308
Description
Summary:The optical chain and logger (OptiCAL) is an autonomous ice-tethered observatory equipped with multiple light sensors for mapping the variation of light with depth. We describe the instrument and present an ensemble calibration for downwelling irradiance EPAR in [µmolm−2s−1]. Results from a long-term deployment in the Arctic Ocean demonstrate that the OptiCAL can cover the high dynamic range of under-ice light levels from July to November and produce realistic values in terms of magnitude when compared to modeled surface irradiance. Transient features of raised light levels at specific depths associated with nearby leads in the ice underline the importance of depth-resolved light measurements.

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