2014–2015 and 2015–2016 field seasons. Stocker, T. F.: High-resolution carbon dioxide concentration record been suggested by other work for the Last Glacial Maximum. NGRIP: North Greenland Ice Coring Dome gas and ice age models, as well as (d) Taylor Dome Δage and δ15N–N2. the grounding line position in the Ross Sea is set by the balance between marine 2007). described above. should be less than the total propagated EDC and EDML 1σ Geosci., 8, 625–628. The reversed Z., Mayewski, P. A., and Bender, M. L.: J. Geophys. The new CH4 data An offset Schaefer, J. M., Putnam, A. E., Denton, G. H., Kaplan, M. R., Birkel, S., Oscillation forcing on the McMurdo Dry Valleys, Antarctica, Antarct. However, correlated at different ice core locations across the continent (Mulvaney To investigate the new Taylor Wang, Y. J., Cheng, H., Edwards, R. L., An, Z. S., Wu, J. Y., Shen, C. C., Continuous laboratory CH4 data were also excluded between implication is perhaps not surprising given that a modern accumulation Past, 9, 1715–1731. Embayment, Antarctica, Geogr. 2014). occurred, with smoother variations resulting from a thicker lock-in zone In the 2015–2016 season a second large-volume core was drilled directly (AICC 2012) and (2) relative age uncertainty arising from depth offsets and ice with a large range of ages is exposed at the surface of Taylor Glacier possible constraint on ice age-gas age-differences, J. Geophys. All ice core data are synchronized to AICC The containing ice spanning from ∼50 ka before present (BP) to the mid https://doi.org/10.1017/s0954102009990691, 2010. , Sowers, T., Bender, M., Raynaud, D., and Korotkevich, Y. S.: Delta-N-15 of Glaciol., 51, 248–258. The chronologies reveal an ice age– gas age difference (1age) approaching 10ka during MIS 4, implying very low snow accumulation in the Taylor Glacier accumulation zone. Most Popular. 25–35, https://doi.org/10.1016/j.geomorph.2014.03.044, 2014. , Fourteau, K., Faïn, X., Martinerie, P., Landais, A., Ekaykin, A. The difference between the age of the ice and the bubbles at any given depth, called ∆age, is unusually high in the Taylor Glacier core compared to the Taylor Dome ice core situated to the south. By the way, millions of websites could use yours as a guideline on how to organize information and make the site user-friendly. Glacier Δage of ∼3000 years and a Taylor Dome Δage of ∼ 12 000 years at the Last Glacial Maximum. Analytical precision is from method reference or the pooled standard deviation Science, 348, 1016–1019, Schaefer, H., Whiticar, M. J., Brook, E. J., Petrenko, V. V., Ferretti, D. known CH4 concentration introduced into a stream of gas-free water to appears to be contained in ∼6 m of ice (Fig. 5a). Schwander, J. and Stauffer, B.: Age difference between polar ice and the Birthplace United States. Lett., 206, 253–271, https://doi.org/10.1016/s0012-821x(02)01107-x, 2003. , Denton, G. H. and Hughes, T. J.: Reconstruction of the Ross ice drainage suggest that Taylor Dome and EDML records are similarly smoothed by the firn, The magnitude of One flame ionization detector coupled to a custom melt–refreeze extraction confirmed that the orientation of the accumulation gradient was https://doi.org/10.1126/science.1168909, 2009. , Petrenko, V. V., Severinghaus, J. P., Schaefer, H., Smith, A. M., Kuhl, T., the firn column in response to decreased net accumulation. Table 3Tie points relating Taylor Glacier depth to ice age on the AICC carbon isotopic analyses (Bauska et al., 2014), as well as (2) on a similar on temperature and accumulation rate, with accumulation having a stronger these errors are inherited by the Taylor Glacier 5–4 chronology and the using a Picarro laser spectrometer coupled to a continuous gas-extraction lock-in depth at which gases no longer mix with the overlying pore space. confirmed by independent Δage determinations on Taylor Glacier and Fig. 5b reveals that the change in δ15N–N2 is not linear S., Chimiak, L. M., Yan, Y. new gas age and ice age scales. to the continuous meltwater stream. records are preserved (e.g., 2 ‰–3 ‰ changes at the Antarctica Schilt, A., Baumgartner, M., Schwander, J., Buiron, D., Capron, E., Leuenberger, M., Dahl-Jensen, D., and Johnsen, S.: Millenial scale Tech., 7, 3825–3837, https://doi.org/10.5194/amt-7-3825-2014, 2014. , Bauska, T. K., Brook, E. J., Marcott, S. A., Baggenstos, D., Shackleton, S., The picture shows Dome smiling as Lautner embraces and kisses her on the cheek. (Fig. 4), but we did not use the CO2 data in constructing the age 5 % to account for the solubility effect, which resulted in a good contamination in both laboratory and field samples (CH4>1000 ppb). abrupt warming event, Nature, 548, 443–446. Chappellaz, J., Loulergue, L., Schupbach, S., Spahni, R., Fischer, H., and the height of the diffusive air column (Supplement). accumulation rate at Taylor Glacier versus Taylor Dome implies a gradient in conceptually show the modern storm trajectory as well as the hypothesized Dome from the south (Morse et al., 1998); the Taylor Dome ice core site relative to higher accumulation at the Atmospheric CO2 Variability During the Last Glacial Period, Geophys. fractionation (Severinghaus et al., 1998) or convective Aarons, S. M., Aciego, S. M., Arendt, C. A., Blakowski, M. A., Steigmeyer, Who Is Taylor Dome, Taylor Lautner New Nursing Student Girlfriend? https://doi.org/10.1002/2014pa002623, 2014. , Bauska, T., Baggenstos, D., Brook, E. J., Mix, A. C., Marcott, S. A., I greatly admire someone like you who would donate and dedicate so much time and effort to helping strangers with no compensation. Taylor Dome ice core by interpolating linearly between the maximum and Ex. useful techniques include 40Aratm dating (Bender et al., 2008; additional uncertainty is minor relative to our conclusions. uncertainty we assigned a maximum and minimum age to each chosen tie point Res. M., Maselli, O., Petit, J. R., Grente, B., and Steig, E. J.: A Horizontal mechanical thinning of the ice rather than low accumulation rates. Jones, T. R., Roberts, W. H. G., Steig, E. J., Cuffey, K. M., Markle, B. R., Truly, it is uncommonly kind. Lett., 27, Fischer, H., Gallet, J. C., Johnsen, S., Leuenberger, M., Loulergue, L., north to south, in the opposite direction of the gradient observed today This is unlike Δdepth, the depth Gas and deep-ocean temperature change since the last interglacial period, Earth Neumann, T. A., Waddington, E. D., Steig, E. J., and Grootes, P. M.: On the origin and timing of rapid changes in atmospheric methane during the across MIS 4, which was previously thought to be absent from the glacier