Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N)
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°N) Eurasian sector of the Arctic Ocean during the summer 2012 record low sea-ice minimum extent. Results show that photosynthetically active radiation (PAR)...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/3226 2024-09-09T19:23:57+00:00 Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) Lund-Hansen, Lars Chresten Markager, Stiig Hancke, Kasper Stratmann, Tanja Rysgaard, Søren Ramløv, Hans Sorrell, Brian K. 2015-09-01 application/pdf text/html application/epub+zip application/xml https://polarresearch.net/index.php/polar/article/view/3226 https://doi.org/10.3402/polar.v34.23978 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3226/pdf_40 https://polarresearch.net/index.php/polar/article/view/3226/html_31 https://polarresearch.net/index.php/polar/article/view/3226/_32 https://polarresearch.net/index.php/polar/article/view/3226/xml_30 https://polarresearch.net/index.php/polar/article/view/3226 doi:10.3402/polar.v34.23978 Polar Research; Vol 34 (2015) 1751-8369 Sea ice transmittance PAR CDOM chl-a Eurasian sector info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftjpolarres https://doi.org/10.3402/polar.v34.23978 2024-06-20T23:33:17Z 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°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 µmol 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 (a375=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: Iz=Io(1−0.55)*(0.09)*exp(−0.17*z).Keywords: Sea ice; transmittance; PAR; CDOM; chl-a; Eurasian sector(Published: 1 September 2015)Citation: Polar Research 2015, 34, 23978,http://dx.doi.org/10.3402/polar.v34.23978 Article in Journal/Newspaper Arctic Arctic Ocean North Atlantic Phytoplankton Polar Research Sea ice Polar Research Arctic Arctic Ocean Pacific Polar Research 34 1 23978 |
institution |
Open Polar |
collection |
Polar Research |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Sea ice transmittance PAR CDOM chl-a Eurasian sector |
spellingShingle |
Sea ice transmittance PAR CDOM chl-a Eurasian sector Lund-Hansen, Lars Chresten Markager, Stiig Hancke, Kasper Stratmann, Tanja Rysgaard, Søren Ramløv, Hans Sorrell, Brian K. Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) |
topic_facet |
Sea ice transmittance PAR CDOM chl-a Eurasian sector |
description |
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°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 µmol 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 (a375=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: Iz=Io(1−0.55)*(0.09)*exp(−0.17*z).Keywords: Sea ice; transmittance; PAR; CDOM; chl-a; Eurasian sector(Published: 1 September 2015)Citation: Polar Research 2015, 34, 23978,http://dx.doi.org/10.3402/polar.v34.23978 |
format |
Article in Journal/Newspaper |
author |
Lund-Hansen, Lars Chresten Markager, Stiig Hancke, Kasper Stratmann, Tanja Rysgaard, Søren Ramløv, Hans Sorrell, Brian K. |
author_facet |
Lund-Hansen, Lars Chresten Markager, Stiig Hancke, Kasper Stratmann, Tanja Rysgaard, Søren Ramløv, Hans Sorrell, Brian K. |
author_sort |
Lund-Hansen, Lars Chresten |
title |
Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) |
title_short |
Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) |
title_full |
Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) |
title_fullStr |
Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) |
title_full_unstemmed |
Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) |
title_sort |
effects of sea-ice light attenuation and cdom absorption in the water below the eurasian sector of central arctic ocean (>88°n) |
publisher |
Norwegian Polar Institute |
publishDate |
2015 |
url |
https://polarresearch.net/index.php/polar/article/view/3226 https://doi.org/10.3402/polar.v34.23978 |
geographic |
Arctic Arctic Ocean Pacific |
geographic_facet |
Arctic Arctic Ocean Pacific |
genre |
Arctic Arctic Ocean North Atlantic Phytoplankton Polar Research Sea ice |
genre_facet |
Arctic Arctic Ocean North Atlantic Phytoplankton Polar Research Sea ice |
op_source |
Polar Research; Vol 34 (2015) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3226/pdf_40 https://polarresearch.net/index.php/polar/article/view/3226/html_31 https://polarresearch.net/index.php/polar/article/view/3226/_32 https://polarresearch.net/index.php/polar/article/view/3226/xml_30 https://polarresearch.net/index.php/polar/article/view/3226 doi:10.3402/polar.v34.23978 |
op_doi |
https://doi.org/10.3402/polar.v34.23978 |
container_title |
Polar Research |
container_volume |
34 |
container_issue |
1 |
container_start_page |
23978 |
_version_ |
1809893904248471552 |