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
2015
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ftdoajarticles:oai:doaj.org/article:dbc31896146c463382aff1bf34c469e2 2023-05-15T15:00:01+02:00 Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N) Lars Chresten Lund-Hansen Stiig Markager Kasper Hancke Tanja Stratmann Søren Rysgaard Hans Ramløv Brian K. Sorrell 2015-09-01T00:00:00Z https://doi.org/10.3402/polar.v34.23978 https://doaj.org/article/dbc31896146c463382aff1bf34c469e2 EN eng Norwegian Polar Institute http://www.polarresearch.net/index.php/polar/article/view/23978/pdf_40 https://doaj.org/toc/1751-8369 1751-8369 doi:10.3402/polar.v34.23978 https://doaj.org/article/dbc31896146c463382aff1bf34c469e2 Polar Research, Vol 34, Iss 0, Pp 1-12 (2015) Sea ice transmittance PAR CDOM chl-a Eurasian sector Environmental sciences GE1-350 Oceanography GC1-1581 article 2015 ftdoajarticles https://doi.org/10.3402/polar.v34.23978 2022-12-31T06:59:19Z 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 (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). Article in Journal/Newspaper Arctic Arctic Ocean North Atlantic Phytoplankton Polar Research Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Pacific Polar Research 34 1 23978 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Sea ice transmittance PAR CDOM chl-a Eurasian sector Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Sea ice transmittance PAR CDOM chl-a Eurasian sector Environmental sciences GE1-350 Oceanography GC1-1581 Lars Chresten Lund-Hansen Stiig Markager Kasper Hancke Tanja Stratmann Søren Rysgaard Hans Ramløv Brian K. Sorrell 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 Environmental sciences GE1-350 Oceanography GC1-1581 |
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 (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). |
format |
Article in Journal/Newspaper |
author |
Lars Chresten Lund-Hansen Stiig Markager Kasper Hancke Tanja Stratmann Søren Rysgaard Hans Ramløv Brian K. Sorrell |
author_facet |
Lars Chresten Lund-Hansen Stiig Markager Kasper Hancke Tanja Stratmann Søren Rysgaard Hans Ramløv Brian K. Sorrell |
author_sort |
Lars Chresten Lund-Hansen |
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://doi.org/10.3402/polar.v34.23978 https://doaj.org/article/dbc31896146c463382aff1bf34c469e2 |
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, Iss 0, Pp 1-12 (2015) |
op_relation |
http://www.polarresearch.net/index.php/polar/article/view/23978/pdf_40 https://doaj.org/toc/1751-8369 1751-8369 doi:10.3402/polar.v34.23978 https://doaj.org/article/dbc31896146c463382aff1bf34c469e2 |
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_ |
1766332122496237568 |