High-resolution ice cores from US ITASE (West Antarctica): development and validation of chronologies and determination of precision and accuracy

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dc.contributor.authorSteig, Eric J.
dc.contributor.authorMayewski, Paul A.
dc.contributor.authorDixon, Daniel A.
dc.contributor.authorKaspari, Susan D.
dc.contributor.authorFrey, Markus M.
dc.contributor.authorSchneider, David P.
dc.contributor.authorArcone, Steven A.
dc.contributor.authorHamilton, Gordon S.
dc.contributor.authorSpikes, V. Blue
dc.contributor.authorAlbert, Mary
dc.contributor.authorMeese, Deb
dc.contributor.authorGow, Anthony J.
dc.contributor.authorShuman, Christopher
dc.contributor.authorWhite, James W.C.
dc.contributor.authorSneed, Sharon
dc.contributor.authorFlaherty, Joseph
dc.contributor.authorWumkes, Mark
dc.date.accessioned2022-02-21T15:10:05Z
dc.date.available2022-02-21T15:10:05Z
dc.date.issued2017-09-14
dc.description.abstractShallow ice cores were obtained from widely distributed sites across the West Antarctic ice sheet, as part of the United States portion of the International Trans-Antarctic Scientific Expedition (US ITASE) program. The US ITASE cores have been dated by annual-layer counting, primarily through the identification of summer peaks in non-sea-salt sulfate (nssSO₄²⁻) concentration. Absolute dating accuracy of better than 2 years and relative dating accuracy better than 1 year is demonstrated by the identification of multiple volcanic marker horizons in each of the cores, Tambora, Indonesia (1815), being the most prominent. Independent validation is provided by the tracing of isochronal layers from site to site using high-frequency ice-penetrating radar observations, and by the timing of mid-winter warming events in stable-isotope ratios, which demonstrate significantly better than 1 year accuracy in the last 20 years. Dating precision to ±1 month is demonstrated by the occurrence of summer nitrate peaks and stable-isotope ratios in phase with nssSO₄²⁻, and winter-time sea-salt peaks out of phase, with phase variation of <1 month. Dating precision and accuracy are uniform with depth, for at least the last 100 years.en_US
dc.description.sponsorshipWe gratefully acknowledge the support of the US Antarctic Research Program, the New York Air National Guard 109th Airborne Division, the staff of Raytheon Polar Services and A. Zielinski at the University of Maine for help in, and getting to, the field. The first author was supported by grant OPP 0196105 from the US National Science Foundation. Suggestions by R. Mulvaney and two anonymous reviewers led to improvements to the manuscript.en_US
dc.description.urihttps://www.cambridge.org/core/journals/annals-of-glaciology/article/highresolution-ice-cores-from-us-itase-west-antarctica-development-and-validation-of-chronologies-and-determination-of-precision-and-accuracy/A7BA6B47A0D941638C6B3A7C5E4C8685en_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2u2qs-in8e
dc.identifier.citationSteig, E., Mayewski, P., Dixon, D., Kaspari, S., Frey, M., Schneider, D., . . . Wumkes, M. (2005). High-resolution ice cores from US ITASE (West Antarctica): Development and validation of chronologies and determination of precision and accuracy. Annals of Glaciology, 41, 77-84. doi:10.3189/172756405781813311en_US
dc.identifier.urihttps://doi.org/10.3189/172756405781813311
dc.identifier.urihttp://hdl.handle.net/11603/24294
dc.language.isoen_USen_US
dc.publisherCambridge Coreen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleHigh-resolution ice cores from US ITASE (West Antarctica): development and validation of chronologies and determination of precision and accuracyen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9606-767Xen_US

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