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dc.contributor.authorSalganik, Evgenii
dc.contributor.authorKatlein, Christian
dc.contributor.authorLange, Benjamin
dc.contributor.authorMatero, Ilkka
dc.contributor.authorLei, Ruibo
dc.contributor.authorFong, Allison A.
dc.contributor.authorFons, Steven
dc.contributor.authorDivine, Dmitry
dc.contributor.authorOggier, Marc
dc.contributor.authorCastellani, Giulia
dc.contributor.authorBozzato, Deborah
dc.contributor.authorChamberlain, Emelia
dc.contributor.authorHoppe, Clara J. M.
dc.contributor.authorMüller, Oliver
dc.contributor.authorGardner, Jessie
dc.contributor.authorRinke, Annette
dc.contributor.authorSimoes Pereira, Patric
dc.contributor.authorUlfsbo, Adam
dc.contributor.authorMarsay, Christopher
dc.contributor.authorWebster, Melinda
dc.contributor.authorMaus, Sønke
dc.contributor.authorHøyland, Knut Vilhelm
dc.contributor.authorGranskog, Mats
dc.date.accessioned2023-08-28T07:47:51Z
dc.date.available2023-08-28T07:47:51Z
dc.date.issued2023-03-31
dc.description.abstractLow-salinity meltwater from Arctic sea ice and its snow cover accumulates and creates under-ice meltwater layers below sea ice.These meltwater layers can result in the formation of new ice layers, or false bottoms, at the interface of this low-salinity meltwater and colder seawater. As part of the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we used a combination of sea ice coring, temperature profiles from thermistor strings and underwater multibeam sonar surveys with a remotely operated vehicle (ROV) to study the areal coverage and temporal evolution of under-ice meltwater layers and false bottoms during the summer melt season from mid-June until late July. ROV surveys indicated that the areal coverage of false bottoms for a part of the MOSAiC Central Observatory (350 by 200 m2 ) was 21%. Presence of false bottoms reduced bottom ice melt by 7–8% due to the local decrease in the ocean heat flux, which can be described by a thermodynamic model. Under-ice meltwater layer thickness was larger below first-year ice and thinner below thicker second-year ice. We also found that thick ice and ridge keels confined the areas in which under-ice meltwater accumulated, preventing its mixing with underlying seawater. While a thermodynamic model could reproduce false bottom growth and melt, it could not describe the observed bottom melt rates of the ice above false bottoms. We also show that the evolution of under-ice meltwaterlayer salinity below first-year ice is linked to brine flushing from the above sea ice and accumulating in the meltwater layer above the false bottom.The results of this study aid in estimating the contribution of underice meltwater layers and false bottoms to the mass balance and salt budget for Arctic summer sea ice.en_US
dc.identifier.citationSalganik, Katlein, Lange, Matero, Lei, Fong, Fons, Divine, Oggier, Castellani, Bozzato, Chamberlain, Hoppe, Müller, Gardner, Rinke, Simoes Pereira, Ulfsbo, Marsay, Webster, Maus, Høyland, Granskog. Temporal evolution of under-ice meltwater layers and false bottoms and their impact on summer Arctic sea ice mass balance. Elementa: Science of the Anthropocene. 2023;11(1)en_US
dc.identifier.cristinIDFRIDAID 2139832
dc.identifier.doi10.1525/elementa.2022.00035
dc.identifier.issn2325-1026
dc.identifier.urihttps://hdl.handle.net/10037/30456
dc.language.isoengen_US
dc.publisherUniversity of California Pressen_US
dc.relation.journalElementa: Science of the Anthropocene
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/730695/EU/Arctic Research Icebreaker Consortium: A strategy for meeting the needs for marine-based research in the Arctic/ARICE/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.subjectVDP::Matematikk og naturvitenskap: 400::Geofag: 450::Andre geofag: 469en_US
dc.subjectVDP::Mathematics and natural scienses: 400::Geosciences: 450::Other geosciences: 469en_US
dc.subjectPolhavet / Arctic oceanen_US
dc.subjectSjøis / Sea iceen_US
dc.titleTemporal evolution of under-ice meltwater layers and false bottoms and their impact on summer Arctic sea ice mass balanceen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution 4.0 International (CC BY 4.0)