WAIS Divide Deep ice core 0-68 ka WD2014 chronology

Sigl, Michael; Buizert, Christo; Fudge, Tyler J; Winstrup, Mai; Cole-Dai, Jihong; McConnell, Joseph R; Ferris, David G; Rhodes, Rachael H; Taylor, Kendrick C; Welten, Kees C; Woodruff, Thomas E; Adolphi, Florian; Baggenstos, Daniel; Brook, Edward J; Caffee, Mark W; Clow, Gary D; Cheng, Hai; Cuffey, Kurt M; Dunbar, Nelia W; Edwards, Ross L; ... (2019). WAIS Divide Deep ice core 0-68 ka WD2014 chronology [Dataset]. In: PANGAEA Data Publisher for Earth & Environmental Science. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research (AWI) and the Center for Marine Environmental Sciences, University of Bremen (MARUM) 10.1594/PANGAEA.902577

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The West Antarctic Ice Sheet (WAIS) Divide deep ice core WD2014 chronology, consisting of ice age, gas age, delta-age and uncertainties therein. The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ~68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP; Sigl et al., 2015, Sigl et al., 2016) have been dated using annual-layer counting based on counting of annual layers observed in the chemical, dust and electrical conductivity records. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing of the cosmogenic isotope records of 10Be from WAIS Divide and 14C for IntCal13. We demonstrated that over the Holocene WD2014 was consistently accurate to better than 0.5% of the age. The chronology for the deep part of the core (below 2850m; 67.8-31.2 ka BP; Buizert et al., 2015) is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age-ice age difference (Delta age) using a combination of firn densification modeling, ice-flow modeling, and a data set of d15N-N2, a proxy for past firn column thickness. The largest Delta age at WD occurs during the Last Glacial Maximum, and is 525 +/- 120 years. We synchronized the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard-Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record.

Item Type:

Dataset

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Sigl, Michael and Baggenstos, Daniel

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry
500 Science > 550 Earth sciences & geology

Publisher:

Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research (AWI) and the Center for Marine Environmental Sciences, University of Bremen (MARUM)

Submitter:

Michael Sigl

Date Deposited:

08 Apr 2020 11:45

Last Modified:

08 Apr 2020 11:45

Publisher DOI:

10.1594/PANGAEA.902577

Uncontrolled Keywords:

annual-layer-counting Antarctica Greenland ice-core Methane WAIS

BORIS DOI:

10.7892/boris.142491

URI:

https://boris.unibe.ch/id/eprint/142491

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