Publication :
Extreme warming and regime shift toward amplified variability in a far northern lake

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bul.description.provenancelf spbfr
bul.rights.dateAccepPubl2020-07-24fr
bul.rights.periodeEmbargoP1Yfr
bul.rights.typeDatedatePublicationfr
dc.contributor.authorBégin, Paschale Noël
dc.contributor.authorTanabe, Yukiko
dc.contributor.authorVincent, Warwick F.
dc.contributor.authorKumagai, Michio
dc.contributor.authorSarrazin, Denis
dc.contributor.authorCulley, Alexander
dc.contributor.authorPaquette, Michel
dc.contributor.authorUchida, Masaki
dc.coverage.spatialNunavut -- Ward Hunt, Îlefr
dc.date.accessioned2020-08-06T13:22:07Z
dc.date.available2021-07-24T00:00:00Z
dc.date.issued2020-07-24
dc.description.abstractMean annual air temperatures in the High Arctic are rising rapidly, with extreme warming events becoming increasingly common. Little is known, however, about the consequences of such events on the ice‐capped lakes that occur abundantly across this region. Here, we compared 2 years of high‐frequency monitoring data in Ward Hunt Lake in the Canadian High Arctic. One of the years included a period of anomalously warm conditions that allowed us to address the question of how loss of multi‐year ice cover affects the limnological properties of polar lakes. A mooring installed at the deepest point of the lake (9.7 m) recorded temperature, oxygen, chlorophyll a (Chl a ) fluorescence, and underwater irradiance from July 2016 to July 2018, and an automated camera documented changes in ice cover. The complete loss of ice cover in summer 2016 resulted in full wind exposure and complete mixing of the water column. This mixing caused ventilation of lake water heat to the atmosphere and 4°C lower water temperatures than under ice‐covered conditions. There were also high values of Chl a fluorescence, elevated turbidity levels and large oxygen fluctuations throughout fall and winter. During the subsequent summer, the lake retained its ice cover and the water column remained stratified, with lower Chl a fluorescence and anoxic bottom waters. Extreme warming events are likely to shift polar lakes that were formerly capped by continuous thick ice to a regime of irregular ice loss and unstable limnological conditions that vary greatly from year to year.fr
dc.identifier.doi10.1002/lno.11546fr
dc.identifier.issn0024-3590fr
dc.identifier.urihttp://hdl.handle.net/20.500.11794/39977
dc.languageengfr
dc.publisherWileyfr
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.subjectClimate changefr
dc.subjectPolarfr
dc.subjectOxygenfr
dc.subjectWinter limnologyfr
dc.subjectIce coverfr
dc.subject.rvmClimat -- Changementsfr
dc.subject.rvmInlandsisfr
dc.subject.rvmLimnologiefr
dc.subject.rvmLacs sous-glaciairesfr
dc.titleExtreme warming and regime shift toward amplified variability in a far northern lakefr
dc.typearticle de recherche
dc.type.legacyCOAR1_1::Texte::Périodique::Revue::Contribution à un journal::Article::Article de recherchefr
dcterms.bibliographicCitationLimnology and oceanography, 1-13 (2020)fr
dspace.accessstatus.time2023-05-24 18:00:48
dspace.entity.typePublication
relation.isAuthorOfPublication0e30a766-22a1-421d-adf4-f78ae2bf83fb
relation.isAuthorOfPublication4b69be55-bb70-443d-ac11-9d860ca6d356
relation.isAuthorOfPublication52bd8ccf-99b7-4127-8cc7-dee212a7b35a
relation.isAuthorOfPublication.latestForDiscovery0e30a766-22a1-421d-adf4-f78ae2bf83fb
relation.isResourceTypeOfPublication4c433ef5-3937-4530-8252-cca17d715747
relation.isResourceTypeOfPublication.latestForDiscovery4c433ef5-3937-4530-8252-cca17d715747
rioxxterms.project.funder-nameMinistry of Education, Culture, Sports, Science and Technologyfr
rioxxterms.project.funder-nameSentinel North programfr
rioxxterms.project.funder-nameArcticNetfr
rioxxterms.project.funder-nameUniversité Laval. Centre d'études nordiquesfr
rioxxterms.project.funder-nameFonds de Recherche du Québec - Nature et Technologiesfr
rioxxterms.project.funder-nameNatural Sciences and Engineering Research Council of Canadafr
rioxxterms.project.funder-nameNorthern Scientific Training Programfr
rioxxterms.versionAccepted Manuscript (AM)fr
rioxxterms.version-of-recordhttps://doi.org/10.1002/lno.11546fr
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