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- W2602733103 abstract "Abstract Eight Ice‐Tethered Profilers were deployed in the Arctic Ocean between 2011 and 2013 to measure vertical distributions of photosynthetically active radiation (PAR) and other bio‐optical properties in ice‐covered water columns, multiple times a day over periods of up to a year. With the radiometers used on these profilers, PAR could be measured to depths of only ∼20–40 m in the central Arctic in late summer under sea ice ∼1 m thick. At lower latitudes in the Beaufort Gyre, late summer PAR was measurable under ice to depths exceeding 125 m. The maximum depths of measurable PAR followed seasonal trends in insolation, with isolumes shoaling in the fall as solar elevation decreased and deepening in spring and early summer after insolation resumed and sea ice diminished. PAR intensities were often anomalously low above 20 m, likely due to a shading effect associated with local horizontal heterogeneity in light transmittance by the overlying sea ice. A model was developed to parameterize these complex vertical PAR distributions to improve estimates of the water column diffuse attenuation coefficient and other related parameters. Such a model is necessary to separate the effect of surface ice heterogeneity on under‐ice PAR profiles from that of the water column itself, so that euphotic zone depth in ice‐covered water columns can be computed using canonical metrics such as the 1% light level. Water column diffuse attenuation coefficients derived from such autonomously‐collected PAR profile data, using this model, agreed favorably with values determined manually in complementary studies." @default.
- W2602733103 created "2017-04-07" @default.
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- W2602733103 date "2017-03-26" @default.
- W2602733103 modified "2023-10-16" @default.
- W2602733103 title "The euphotic zone under Arctic Ocean sea ice: Vertical extents and seasonal trends" @default.
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- W2602733103 doi "https://doi.org/10.1002/lno.10543" @default.
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