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Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Kjellman, Sofia E.
dc.contributor.author Schomacker, Anders
dc.contributor.author Thomas, Elizabeth K.
dc.contributor.author Håkansson, Lena
dc.contributor.author Duboscq, Sandrine
dc.contributor.author Cluett, Allison A.
dc.contributor.author Farnsworth, Wesley
dc.contributor.author Allaart, Lis
dc.contributor.author Cowling, Owen C.
dc.contributor.author McKay, Nicholas P.
dc.contributor.author Brynjólfsson, Skafti
dc.contributor.author Ingolfsson, Olafur
dc.date.accessioned 2020-12-11T14:11:41Z
dc.date.available 2020-12-11T14:11:41Z
dc.date.issued 2020-07-15
dc.identifier.citation Kjellman, S.E., Schomacker, A., Thomas, E.K., Håkansson, L., Duboscq, S., Cluett, A.A., Farnsworth, W.R., Allaart, L., Cowling, O.C., Mckay, N.P., Brynjólfsson, S., Ingólfsson, Ó., 2020. Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions. Quaternary Science Reviews. doi:10.1016/j.quascirev.2020.106388
dc.identifier.issn 0277-3791
dc.identifier.uri https://hdl.handle.net/20.500.11815/2290
dc.description Publisher's version (útgefin grein)
dc.description.abstract Arctic precipitation is predicted to increase in the coming century, due to a combination of enhanced northward atmospheric moisture transport and local surface evaporation from ice-free seas. However, large model uncertainties, limited long-term observations, and high spatiotemporal variability limit our understanding of these mechanisms, emphasizing the need for paleoclimate records of precipitation changes. Here we use lipid biomarkers in lake sediments to reconstruct precipitation seasonality in northern Spitsbergen, Svalbard. We measured the hydrogen isotopic ratios (δ2H) of n-alkanoic acids (C20–C30) from sedimentary leaf waxes in lake Austre Nevlingen, Spitsbergen. We interpret δ2H values of mid-chain (C22) and long-chain (C28) n-alkanoic acids to represent δ2H of lake and soil water, respectively. Austre Nevlingen lake water δ2H reflects amount-weighted mean annual precipitation δ2H. In contrast, soil water is mostly recharged by summer rainfall, and therefore reflects δ2H values of summer precipitation. Austre Nevlingen leaf wax δ2H values are 2H-depleted in the Early Holocene, suggesting high winter precipitation amounts. This coincides with high summer insolation, strong Atlantic water advection and reduced spring sea-ice cover in surrounding waters. Winter precipitation continued to dominate until c. 6 cal. kyr BP. After 6 cal. kyr BP, the trend in the biomarker record is not as clear. This could be related to colder conditions causing longer duration of seasonal lake-ice cover, thereby influencing the precipitation seasonality registered by the lake water. The Austre Nevlingen record suggests a close relationship between precipitation seasonality and regional ocean surface conditions, consistent with simulations suggesting that Arctic winter sea-ice loss will lead to increased local evaporation.
dc.description.sponsorship Fieldwork, radiocarbon dates, and laboratory analyses were funded by the Carlsberg Foundation (grant number CF14-0756 to AS), the Nansen Foundation (to AS), and the Svalbard Environmental Protection Fund (grant number 17/101 to AS and 17/114 to LA). The 2015 fieldwork was partly funded by the University Centre in Svalbard (UNIS) Research Fund (grant to ÓI). Laboratory analyses and technician support were also funded by National Science Foundation Grant (grant number 1652274 to EKT) and a UB Center for Undergraduate Research and Creative Activities Grant (to SD). We thank Sveinn Brynjólfsson and Sara Mollie Cohen for field assistance, Mike Retelle for providing field equipment, Marie-Louise Siggaard-Andersen for assistance with the ITRAX-scanning, and Alexandra Rouillard for macrofossil identification and data discussion. Finally, we thank Willem van der Bilt and one anonymous reviewer for constructive comments that improved this manuscript.
dc.format.extent 106388
dc.language.iso en
dc.publisher Elsevier BV
dc.relation.ispartofseries Quaternary Science Reviews;240
dc.rights info:eu-repo/semantics/openAccess
dc.subject Arctic
dc.subject Biomarkers
dc.subject Hydrogen isotopes
dc.subject Lake sediment
dc.subject n-alkanoic acids
dc.subject Paleoclimatology
dc.subject Precipitation seasonality
dc.subject Quaternary
dc.subject Sea ice
dc.subject Norður-heimskautið
dc.subject Fornveðurfræði
dc.subject Kvartertímabilið
dc.title Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions
dc.type info:eu-repo/semantics/article
dcterms.license This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.description.version Peer Reviewed
dc.identifier.journal Quaternary Science Reviews
dc.identifier.doi 10.1016/j.quascirev.2020.106388
dc.relation.url https://www.sciencedirect.com/science/article/pii/S0277379120303504?via%3Dihub
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.department Jarðvísindadeild (HÍ)
dc.contributor.department Faculty of Earth Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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