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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; Edwards, Larry; Geng, Lei; Iverson, Nels; Koffman, Bess G; Layman, Larry; Markle, Bradley R; Maselli, Olivia J; McGwire, Kenneth C; Muscheler, Raimund; Nishiizumi, Kunihiko; Pasteris, Daniel R; Severinghaus, Jeffrey P; Sowers, Todd A; Steig, Eric J (2019): WAIS Divide Deep ice core 0-68 ka WD2014 chronology. PANGAEA, https://doi.org/10.1594/PANGAEA.902577

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Abstract:
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.
Keyword(s):
annual-layer-counting; Antarctica; chronology; Greenland; ice-core; Methane; WAIS
Related to:
Buizert, Christo; Cuffey, Kurt M; Severinghaus, Jeffrey P; Baggenstos, Daniel; Fudge, Tyler J; Steig, Eric J; Markle, Bradley R; Winstrup, Mai; Rhodes, Rachael H; Brook, Edward J; Sowers, Todd A; Clow, Gary D; Cheng, Hai; Edwards, Ross L; Sigl, Michael; McConnell, Joseph R; Taylor, Kendrick C (2015): The WAIS Divide deep ice core WD2014 chronology - Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference. Climate of the Past, 11(2), 153-173, https://doi.org/10.5194/cp-11-153-2015
Sigl, Michael; Fudge, Tyler J; Winstrup, Mai; Cole-Dai, Jihong; Ferris, David G; McConnell, Joseph R; Taylor, Kendrick C; Welten, Kees C; Woodruff, Thomas E; Adolphi, Florian; Bisiaux, Marion M; Brook, Edward J; Buizert, Christo; Caffee, Mark W; Dunbar, Nelia W; Edwards, Ross L; Geng, Lei; Iverson, Nels; Koffman, Bess G; Layman, Lawrence; Maselli, Olivia J; McGwire, Kenneth C; Muscheler, Raimund; Nishiizumi, Kunihiko; Pasteris, Daniel R; Rhodes, Rachael H; Sowers, Todd A (2016): The WAIS Divide deep ice core WD2014 chronology – Part 2: Annual-layer counting (0–31 ka BP). Climate of the Past, 12(3), 769-786, https://doi.org/10.5194/cp-12-769-2016
Sigl, Michael; Winstrup, Mai; McConnell, Joseph R; Welten, Kees C; Plunkett, Gill; Ludlow, F; Büntgen, Ulf; Caffee, Mark W; Chellman, Nathan J; Dahl-Jensen, Dorthe; Fischer, H; Kipfstuhl, Sepp; Kostick, C; Maselli, Olivia J; Mekhaldi, Florian; Mulvaney, Robert; Muscheler, Raimund; Pasteris, Daniel R; Pilcher, John R; Salzer, Matthew W; Schüpbach, Simon; Steffensen, J P; Vinther, Bo M; Woodruff, Thomas E (2015): Timing and climate forcing of volcanic eruptions for the past 2,500 years. Nature, 523(7562), 543-549, https://doi.org/10.1038/nature14565
Coverage:
Latitude: -79.480000 * Longitude: -112.110000
Minimum DEPTH, ice/snow: 0.360 m * Maximum DEPTH, ice/snow: 3392.936 m
Event(s):
WDC-06A (WAIS Divide) * Latitude: -79.480000 * Longitude: -112.110000 * Elevation: 1766.0 m * Location: Antarctica, west * Device: Ice drill (ICEDRILL)
Comment:
Citing the timescales:
for 0.2.4 ka BP use Sigl et al., (2015);
for 2.4-31.2 ka use Sigl et al., (2016);
for 31.2-68 ka BP use Buizert et al., (2015).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, ice/snowDepth ice/snowmSigl, MichaelGeocode
2Calendar ageCal ageka BPSigl, Michaelice age
3Calendar age, errorCal age e±Sigl, Michaelice age uncertainty due to annual layer count (2 sigma)
4Calendar age, errorCal age e±Sigl, Michaelice age uncertainty due to CH4 synchronization (2 sigma)
5Gas ageGas ageka BPSigl, Michaelgas age
6Age, errorAge e±Sigl, Michaelgas age uncertainty (2 sigma)
7Age, differenceAge diffkaSigl, Michaelgas age-ice age difference (delta age)
8Age, difference errorAge diff e±Sigl, Michaeldelta age uncertainty (2 sigma)
Size:
392326 data points

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