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

Bernhard Schartmüller; Philip Anderson; David Mckee; Stacey Connan-Mcginty; Tomasz p. Kopec; Malin Daase; Geir Johnsen; Jørgen Berge

doi:10.1364/AO.502437

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

Bernhard Schartmüller, Philip Anderson, David Mckee, Stacey Connan-Mcginty, Tomasz p. Kopec, Malin Daase, Geir Johnsen, Jørgen Berge

SAMS UHI

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Abstract

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.

Original language	English
Article number	8308
Number of pages	8
Journal	Applied Optics
Volume	62
Issue number	31
DOIs	https://doi.org/10.1364/AO.502437
Publication status	Published - 23 Oct 2023

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ao-62-31-8308Final published version, 18.7 MBLicence: CC BY

https://opg.optica.org/abstract.cfm?URI=ao-62-31-8308

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

abstract = "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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AU - Schartmüller, Bernhard

AU - Anderson, Philip

AU - Mckee, David

AU - Connan-Mcginty, Stacey

AU - Kopec, Tomasz p.

AU - Daase, Malin

AU - Johnsen, Geir

AU - Berge, Jørgen

N1 - Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. https://doi.org/10.1364/AO.502437

PY - 2023/10/23

Y1 - 2023/10/23

N2 - 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.

AB - 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.

U2 - 10.1364/AO.502437

DO - 10.1364/AO.502437

M3 - Article

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VL - 62

JO - Applied Optics

JF - Applied Optics

IS - 31

M1 - 8308

ER -

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

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