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dc.contributor.authorKjellman, Sofia Elisabeth
dc.contributor.authorThomas, Elizabeth K.
dc.contributor.authorFarnsworth, Wesley R.
dc.contributor.authorCowling, Owen C.
dc.contributor.authorAllaart, Lis
dc.contributor.authorBrynjólfsson, Skafti
dc.contributor.authorSchomacker, Anders
dc.date.accessioned2024-06-04T11:12:18Z
dc.date.available2024-06-04T11:12:18Z
dc.date.issued2024-05-26
dc.description.abstractSvalbard spans large climate gradients, associated with atmospheric circulation patterns and variations in ocean heat content and sea ice cover. Future precipitation increases are projected to peak in the northeast and to mainly occur in winter, but uncertainties underscore the need for reconstructions of long-term spatial and temporal variations in precipitation amounts and seasonality. We use lipid biomarkers from four sedimentary lake records along a climatic gradient from western to northeastern Svalbard to reconstruct Holocene water cycle changes. We measured the leaf wax hydrogen isotopic composition of long-chain (terrestrial) and mid-chain (aquatic) n-alkanoic acids, reflecting δ<sup>2</sup>H of precipitation (δ<sup>2</sup>H<sub>precip</sub>) and lake water (δ<sup>2</sup>H<sub>lake</sub>), respectively. δ<sup>2</sup>H<sub>precip</sub> values mainly reflect summer precipitation δ<sup>2</sup>H and evapotranspiration, whereas δ<sup>2</sup>H<sub>lake</sub> values can reflect various precipitation seasonality due to varying lake hydrology. For one lake, we used the difference between δ<sup>2</sup>H<sub>precip</sub> and δ<sup>2</sup>H<sub>lake</sub> (ε<sub>precip-lake</sub>) to infer summer evapotranspiration changes. Relatively 2H-enriched δ<sup>2</sup>H<sub>precip</sub> values and higher εprecip-lake in the Early and Middle Holocene suggest warm summers with higher evapotranspiration, and/or more proximal summer moisture. After c. 6 cal. ka BP, <sup>2</sup>H-depleted δ<sup>2</sup>H<sub>precip</sub> values and lower εprecip-lake indicate summer cooling, less evapotranspiration, or more distally derived moisture. Early to Middle Holocene decrease in δ<sup>2</sup>H<sub>lake</sub> values in two northern Spitsbergen lakes reflects an increase in the proportion of winter relative to summer precipitation, associated with regional warming and increased moisture supply, which may be due to increased distal moisture supply and/or reduced sea ice cover. Our northern Svalbard δ<sup>2</sup>H<sub>lake</sub> records suggest great Late Holocene climate variability with periodic winter precipitation increases or decreases in summer precipitation inflow to the lakes. We find that Holocene summer precipitation δ<sup>2</sup>H values mainly follow changes in summer insolation and temperature, whereas the seasonal distribution of precipitation is sensitive to catchment hydrology, regional ocean surface conditions, and moisture source changes.en_US
dc.identifier.citationKjellman, Thomas, Farnsworth, Cowling, Allaart, Brynjólfsson, Schomacker. Seasonal precipitation variability on Svalbard inferred from Holocene sedimentary leaf wax δ2H. Boreas. 2024en_US
dc.identifier.cristinIDFRIDAID 2272187
dc.identifier.doi10.1111/bor.12661
dc.identifier.issn0300-9483
dc.identifier.issn1502-3885
dc.identifier.urihttps://hdl.handle.net/10037/33714
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalBoreas
dc.relation.projectIDNorges forskningsråd: 269984en_US
dc.relation.projectIDNational Science Foundation: EAR-IF1652274en_US
dc.relation.projectIDSvalbards miljøvernfond: 20/36en_US
dc.relation.projectIDSvalbards miljøvernfond: 17/101en_US
dc.relation.projectIDSvalbards miljøvernfond: 16/35en_US
dc.relation.projectIDCarlsbergfondet: CF14-0756en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2024 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.titleSeasonal precipitation variability on Svalbard inferred from Holocene sedimentary leaf wax δ2Hen_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)