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dc.contributor.authorDybwad, Christine
dc.contributor.authorAssmy, Philipp
dc.contributor.authorOlsen, Lasse Mork
dc.contributor.authorPeeken, Ilka
dc.contributor.authorNikolopoulos, Anna
dc.contributor.authorKrumpen, Thomas
dc.contributor.authorRandelhoff, Achim
dc.contributor.authorTatarek, Agnieszka
dc.contributor.authorWiktor, Józef M.
dc.contributor.authorReigstad, Marit
dc.date.accessioned2021-07-13T08:29:21Z
dc.date.available2021-07-13T08:29:21Z
dc.date.issued2021-01-21
dc.description.abstractPhytoplankton blooms in the Arctic Ocean's seasonal sea ice zone are expected to start earlier and occur further north with retreating and thinning sea ice cover. The current study is the first compilation of phytoplankton bloom development and fate in the seasonally variable sea ice zone north of Svalbard from winter to late summer, using short-term sediment trap deployments. Clear seasonal patterns were discovered, with low winter and pre-bloom phytoplankton standing stocks and export fluxes, a short and intense productive season in May and June, and low Chl <i>a</i> standing stocks but moderate carbon export fluxes in the autumn post-bloom conditions. We observed intense phytoplankton blooms with Chl <i>a</i> standing stocks of >350 mg m<sup>−2</sup> below consolidated sea ice cover, dominated by the prymnesiophyte <i>Phaeocystis pouchetii</i>. The largest vertical organic carbon export fluxes to 100 m, of up to 513 mg C m<sup>−2</sup> day<sup>−1</sup>, were recorded at stations dominated by diatoms, while those dominated by <i>P. pouchetii</i> recorded carbon export fluxes up to 310 mg C m<sup>−2</sup> day<sup>−1</sup>. Fecal pellets from krill and copepods contributed a substantial fraction to carbon export in certain areas, especially where blooms of <i>P. pouchetii</i> dominated and Atlantic water advection was prominent. The interplay between the taxonomic composition of protist assemblages, large grazers, distance to open water, and Atlantic water advection was found to be crucial in determining the fate of the blooms and the magnitude of organic carbon exported out of the surface water column. Previously, the marginal ice zone was considered the most productive region in the area, but our study reveals intense blooms and high export events in ice-covered waters. This is the first comprehensive study on carbon export fluxes for under-ice phytoplankton blooms, a phenomenon suggested to have increased in importance under the new Arctic sea ice regime.en_US
dc.identifier.citationDybwad, Assmy, Olsen, Peeken, Nikolopoulos, Krumpen, Randelhoff, Tatarek, Wiktor, Reigstad. Carbon export in the seasonal sea ice zone north of Svalbard from winter to late summer. Frontiers in Marine Science. 2021;7en_US
dc.identifier.cristinIDFRIDAID 1876258
dc.identifier.doi10.3389/fmars.2020.525800
dc.identifier.issn2296-7745
dc.identifier.urihttps://hdl.handle.net/10037/21865
dc.language.isoengen_US
dc.publisherFrontiers Mediaen_US
dc.relation.ispartofDybwad, C. (2023). Vertical Carbon Export in a Changing Arctic Seasonal Ice Zone: Composition and seasonality in the area north of Svalbard and in an Arctic glacial fjord. (Doctoral thesis). <a href=https://hdl.handle.net/10037/31883>https://hdl.handle.net/10037/31883</a>
dc.relation.journalFrontiers in Marine Science
dc.relation.projectIDNorges forskningsråd: 226415en_US
dc.relation.projectIDNorges forskningsråd: 244646en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/244646/Norway/Ice-algal and under-ice phytoplankton bloom dynamics in a changing Arctic icescape//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/226415/Norway/Bridging marine productivity regimes: How Atlantic advection affects productivity, carbon cycling and export in a melting Arctic Ocean//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titleCarbon export in the seasonal sea ice zone north of Svalbard from winter to late summeren_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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