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Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N)
Aarhus Univ, Dept Biosci, Aquat Biol, DK-8000 Aarhus C, Denmark.;Aarhus Univ, Arctic Res Ctr, DK-8000 Aarhus C, Denmark..
Aarhus Univ, Marine Ecol, Dept Biosci, DK-4000 Roskilde, Denmark..
Univ So Denmark, Dept Biol, Nordic Ctr Earth Evolut, DK-5230 Odense M, Denmark..
Royal Netherlands Inst Sea Res, Ecosyst Studies, NL-4401 NT Yerseke, Netherlands..
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2015 (English)In: Polar Research, ISSN 0800-0395, E-ISSN 1751-8369, Vol. 34, 23978Article in journal (Refereed) Published
Abstract [en]

This is a study of the optical, physical and biological parameters of sea ice and the water below it at stations (n = 25) in the central (> 88 degrees N) Eurasian sector of the Arctic Ocean during the summer 2012 record low sea-ice minimum extent. Results show that photosynthetically active radiation (PAR) transmittance of the ice was low (0.09) and apparently related to a high degree of backscattering by air-filled brine channels left by brine draining. The under-ice PAR was also low (8.4 +/- 4.5 SD mu mol photons m(-2) s(-1)) and partly related to the low transmittance. There were no significant differences in multi-year and first-year PAR transmittances. In spite of this low under-ice PAR, only 3% of the transmitted PAR through the ice was absorbed by phytoplankton in the water. On average, chlorophyll-a concentrations were low (0.34 +/- 0.69 SD mg chl-a m(-3)) in the water compared to the high (a(375) = 0.52 m(-1)) coloured dissolved organic matter (CDOM) absorption coefficient with a strong terrestrial optical signature. Two distinct clusters of stations with waters of Pacific and North Atlantic origin were identified based on significant differences in temperature, salinity and CDOM absorption coefficient between water masses. The under-ice light field for bare ice was parameterized as follows: I-z = I-o(1 -0.55)*(0.09)* exp ((-0.17*z)).

Place, publisher, year, edition, pages
2015. Vol. 34, 23978
Keyword [en]
Sea ice, transmittance, PAR, CDOM, chl-a, Eurasian sector
National Category
Natural Sciences
Research subject
SWEDARCTIC 2012, LOMROG III
Identifiers
URN: urn:nbn:se:polar:diva-2323DOI: 10.3402/polar.v34.23978ISI: 000360809800001OAI: oai:DiVA.org:polar-2323DiVA: diva2:858366
Available from: 2015-10-02 Created: 2015-10-02 Last updated: 2016-11-11

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