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dc.contributor.authorBailey, Hannah L.
dc.contributor.authorKaufman, Darrell S.
dc.contributor.authorSloane, Hilary J.
dc.contributor.authorHubbard, Alun Lloyd
dc.contributor.authorHenderson, Andrew C.G.
dc.contributor.authorLeng, Melanie J.
dc.contributor.authorMeyer, Hanno
dc.contributor.authorWelker, Jeffrey M.
dc.date.accessioned2018-08-13T12:34:36Z
dc.date.available2018-08-13T12:34:36Z
dc.date.issued2018-07-02
dc.description.abstractThe North Pacific is a zone of cyclogenesis that modulates synoptic-scale atmospheric circulation, yet there is a paucity of instrumental and paleoclimate data to fully constrain its long-term state and variability. We present the first Holocene oxygen isotope record (δ<sup>18</sup>O<sub>diatom</sub>) from the Aleutian Islands, using siliceous diatoms preserved in Heart Lake on Adak Island (51.85° N, 176.69° W). This study builds on previous work demonstrating that Heart Lake sedimentary δ<sup>18</sup>O<sub>diatom</sub> values record the δ<sup>18</sup>O signal of precipitation, and correlate significantly with atmospheric circulation indices over the past century. We apply this empirical relationship to interpret a new 9.6 ka δ<sup>18</sup>O<sub>diatom</sub> record from the same lake, supported by diatom assemblage analysis. Our results demonstrate distinct shifts in the prevailing trajectory of storm systems that drove spatially heterogeneous patterns of moisture delivery and climate across the region. During the early-mid Holocene, a warmer/wetter climate prevailed due to a predominantly westerly Aleutian Low that enhanced advection of warm 18O-enriched Pacific moisture to Adak, and culminated in a δ<sup>18</sup>O<sub>diatom</sub> maxima (33.3‰) at 7.6 ka during the Holocene Thermal Maximum. After 4.5 ka, relatively lower δ<sup>18</sup>O<sub>diatom</sub> indicates cooler/drier conditions associated with enhanced northerly circulation that persisted into the 21st century. Our analysis is consistent with surface climate conditions inferred from a suite of terrestrial and marine climate-proxy records. This new Holocene dataset bridges the gap in an expanding regional network of paleoisotope studies, and provides a fresh assessment of the complex spatial patterns of Holocene climate across Beringia and the atmospheric forces driving them.en_US
dc.description.sponsorshipNSF award EAR 0823522 NERC grants NERC CASE award Lloyds of London Fulbright Fellowshipen_US
dc.descriptionAccepted manuscript version. Published version available at <a href=https://doi.org/10.1016/j.quascirev.2018.06.027> https://doi.org/10.1016/j.quascirev.2018.06.027</a>. Accepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0.</a>en_US
dc.identifier.citationBailey, H.L., Kaufman, D.S., Sloane, H.J., Hubbard, A.L., Henderson, A.C.G., Leng, M.J., ... Welker, J.M. (2018). Holocene atmospheric circulation in the central North Pacific: A newterrestrial diatom and δ18O dataset from the Aleutian Islands. Quaternary Science Reviews, 194, 27-38. https://doi.org/10.1016/j.quascirev.2018.06.027en_US
dc.identifier.cristinIDFRIDAID 1595345
dc.identifier.doi10.1016/j.quascirev.2018.06.027
dc.identifier.issn0277-3791
dc.identifier.issn1873-457X
dc.identifier.urihttps://hdl.handle.net/10037/13385
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalQuaternary Science Reviews
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi, glasiologi: 465en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology, glaciology: 465en_US
dc.subjectHoloceneen_US
dc.subjectPaleoclimateen_US
dc.subjectNorth Pacificen_US
dc.subjectLimnologyen_US
dc.subjectStable isotopesen_US
dc.subjectDiatomsen_US
dc.titleHolocene atmospheric circulation in the central North Pacific: A new terrestrial diatom and d18O dataset from the Aleutian Islandsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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