Midnight sun to polar night : a model of seasonal light in the Barents Sea
Connan-McGinty, Stacey and Banas, Neil S. and Berge, Jørgen and Cottier, Finlo and Grant, Stephen and Johnsen, Geir and Kopec, Tomasz P. and Porter, Marie and McKee, David (2022) Midnight sun to polar night : a model of seasonal light in the Barents Sea. Journal of Advances in Modeling Earth Systems, 14 (10). e2022MS003198. ISSN 1942-2466 (https://doi.org/10.1029/2022MS003198)
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Abstract
Arctic marine ecosystems are strongly influenced by the extreme seasonality of light in the region. Accurate determination of light is essential for building a comprehensive understanding of the dynamics of animal and aquatic algae populations. Current approaches to underwater light field parameterisations rely upon shortwave radiation (300–3000 nm) estimates from satellites or surface radiometry measurements to populate full radiative transfer software. Due to the inaccessibility of many regions in the Arctic, measured data is not widely available. This study presents a model of spectrally resolved underwater light in ice-free conditions in the Barents Sea. Given a location and time, the model accounts for downwelling spectral irradiance in the photosynthetically active radiation (PAR, 400–700 nm) range (E D PAR) at the ocean surface from solar, lunar, and galactic light sources, modulated by local cloud cover. We demonstrate the ability to extend over the full year into the period of Polar Night, validated in both broadband PAR and spectral domains. Using a bio-optical model of diffuse attenuation developed for the Barents Sea, we show accurate calculations to depth for inhomogeneous water columns over a spatial-temporal range, validated against time series irradiance data from the ArcLight observatory in Ny-Ålesund, Svalbard and in-situ irradiance sensors deployed in the Barents Sea. Finally, in comparison to state-of-the-art radiative transfer models, averaged over the water column we demonstrate a typical mean absolute error of <1 μmol m −2 s −1 in E D PAR for overcast conditions (<6 μmol m −2 s −1 for clear-sky) and reduced execution time of factor 20.
ORCID iDs
Connan-McGinty, Stacey ORCID: https://orcid.org/0000-0001-8661-8984, Banas, Neil S. ORCID: https://orcid.org/0000-0002-1892-9497, Berge, Jørgen, Cottier, Finlo, Grant, Stephen, Johnsen, Geir, Kopec, Tomasz P., Porter, Marie and McKee, David ORCID: https://orcid.org/0000-0001-8023-5923;-
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Item type: Article ID code: 82532 Dates: DateEvent31 October 2022Published20 September 2022Published Online15 September 2022Accepted18 May 2022SubmittedSubjects: Science > Physics > Optics. Light
Geography. Anthropology. Recreation > Oceanography
Geography. Anthropology. Recreation > Environmental SciencesDepartment: Faculty of Science > Physics
Strategic Research Themes > Ocean, Air and Space
Faculty of Science > Mathematics and StatisticsDepositing user: Pure Administrator Date deposited: 04 Oct 2022 10:41 Last modified: 23 Sep 2024 00:53 URI: https://strathprints.strath.ac.uk/id/eprint/82532