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dc.contributor.authorJohnsen, Geir
dc.contributor.authorNorli, Marit
dc.contributor.authorMoline, Mark A.
dc.contributor.authorRobbins, Ian
dc.contributor.authorQuillfeldt, Cecilie von
dc.contributor.authorSørensen, Kai
dc.contributor.authorCottier, Finlo Robert
dc.contributor.authorBerge, Jørgen
dc.date.accessioned2018-12-14T12:18:23Z
dc.date.available2018-12-14T12:18:23Z
dc.date.issued2018-02-13
dc.description.abstractUnder-ice blooms of phytoplankton in the Chukchi Sea have been observed, with strong implications for our understanding of the production regimes in the Arctic Ocean. Using a combination of satellite remote sensing of phytoplankton biomass, in situ observations under sea ice from an autonomous underwater vehicle (AUV), and in vivo photophysiology, we examined the composition, magnitude and origin of a bloom detected beneath the sea ice Northwest of Svalbard (Southern Yermak Plateau) in May 2010. In situ concentration of up to 20 mg chlorophyll a [Chl a] m<sup>−3</sup>, were dominated by the northern planktonic spring species of diatoms, <i>Thalassiosira nordenskioeldii</i>, <i>T. antarctica</i> var. <i>borealis, Chaetoceros socialis species complex</i> and <i>Fragilariopsis oceanica</i>. These species were also found south of the marginal ice zone (MIZ). Cells in the water column under the sea ice were typically high-light acclimated, with a mean light saturation index (E<sub>k</sub>) of 138 μmol photons m<sup>−2</sup> s<sup>−1</sup> and a ratio between photoprotective carotenoids (PPC) and Chl a (w:w) of 0.2. Remotely sensed data of [Chl a] showed a 32,000 km<sup>2</sup> bloom developing south of the MIZ. In effect, our data suggest that the observed under-ice bloom was in fact a bloom developed in open waters south of the ice edge, and that a combination of northward-flowing water masses and southward drifting sea ice effectively positioned the bloom under the sea ice. This have implications for our general understanding of under-ice blooms, suggesting that their origin and connection with open water may be different in different regions of the Arctic.en_US
dc.description.sponsorshipNERCen_US
dc.descriptionSource at <a href=https://doi.org/10.1007/s00300-018-2278-5> https://doi.org/10.1007/s00300-018-2278-5</a>.en_US
dc.identifier.citationJohnsen, G., Norli, M., Moline, M., Robbins, I., Quillfeldt, C. von, Sørensen, K., ... Berge, J. (2018). The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms. <i>Polar Biology</i>, 41(6), 1197-1216. https://doi.org/10.1007/s00300-018-2278-5en_US
dc.identifier.cristinIDFRIDAID 1570375
dc.identifier.doi10.1007/s00300-018-2278-5
dc.identifier.issn0722-4060
dc.identifier.issn1432-2056
dc.identifier.urihttps://hdl.handle.net/10037/14336
dc.language.isoengen_US
dc.publisherSpringer Verlag (Germany)en_US
dc.relation.journalPolar Biology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/244319/Norway/Arctic Ocean ecosystems - Applied technology, Biological interactions and Consequences in an era of abrupt climate change//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223254/Norway/Centre for Autonomous Marine Operations and Systems/AMOS/en_US
dc.relation.urihttps://doi.org/10.1007/s00300-018-2278-5
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectSea-ice algaeen_US
dc.subjectUnder-ice bloomen_US
dc.subjectphytoplanktonen_US
dc.subjectPhotoacclimationen_US
dc.subjectAdvection of cellsen_US
dc.subjectArcticen_US
dc.subjectSatelliteen_US
dc.subjectAutonomous underwater vehicleen_US
dc.subjectChlorophyll aen_US
dc.subjectPulse amplitude modulated fluorescence (PAM)en_US
dc.titleThe advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platformsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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