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

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https://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/A7BA6B47A0D941638C6B3A7C5E4C8685

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https://doi.org/10.3189/172756405781813311
 http://hdl.handle.net/11603/24294

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UMBC Joint Center for Earth Systems Technology (JCET)

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https://orcid.org/0000-0001-9606-767X

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2017-09-14

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journal articles
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Steig, 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:10.3189/172756405781813311

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This 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.
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Abstract

Shallow 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.