File:Ngrip deltao18 12000 0 1.svg

Summary[edit]

This graph is made with SciDavis from NGRIP oxygen istope data.

http://www.gfy.ku.dk/~www-glac/data/GICC05_NGRIP_GRIP_20y_27nov2006.txt

% Greenland Ice Core Chronology 2005 (GICC05) released 27 November 2006 % File name GICC05_NGRIP_GRIP_20y_27nov2006 % 0-14.7 ka b2k part of time scale released March 10, 2006. This file released November 27, 2006. % % NGRIP d18O values on GICC05 time scale back to 41.76 ka b2k (years relative to A.D. 2000). % GRIP d18O values on GICC05 time scale back to 32.44 ka b2k (years relative to A.D. 2000). % Holocene data for NGRIP1, NGRIP2, GRIP, and DYE-3 can be found in a separate file, named % GICC05_Holocene_20y_27nov2006.txt obtainable form www.icecores.dk. % % The concept of maximum counting error (right column) is introduced in Rasmussen et al., 2006 (see below). % In a standard deviation context, the maximum counting error should be regarded as 2 sigma as % discussed in Andersen et al. (see below). % % Age and depth values refer to the bottom of each interval. % Thus the depth interval 14.15-20.4 m corresponds to the time interval 40 - 60 b2k. % % The NGRIP1 core reaches down to a depth of 1372 m. The NGRIP2 core (drilled 20 meters away from the % NGRIP1 core) reaches from surface to bedrock, but high-resolution measurements have only been carried % out downwards from 1346 m. In the 26 m overlap zone, the cores are offset by 0.43 m on average, % probably due to uncertainties in the logging procedure (see Sch�tt Hvidberg et al., Ann. Glac. 35, 2002). % Thus, the same features appear at larger depths in the NGRIP1 than in the NGRIP2 core. % In this file, NGRIP1 depths are used until 9820 b2k, and NGRIP2 depths are used below this. % % In the Holocene, GRIP is dated year by year. Below 11700 b2k the NGRIP based time scale % has been transferred to GRIP depths by linear interpolation between volcanic match points (markers shown % on Fig. 10 in Rasmussen et al. (2006) down to 14.7 ka b2k and in Rasmussen et al. (2007) below this). % These matchpoints are available for download at http://www.icecores.dk. % The maximum counting error in the right-most column does not include uncertainty from this interpolation. % % (*) Note that GRIP d18O data for the period 11700-14760 b2k have been revised as compared to the % March 10 release (filename: GICC05_20y_10march2006.txt). GRIP d18O data in the March 10 release % suffered a computational age-offset. % % % REFERENCES % % The dating of the 0-7.9 ka b2k part is described in the paper: % B.M. Vinther, H.B. Clausen, S.J. Johnsen, S.O. Rasmussen, K.K. Andersen, S.L. Buchardt, % D. Dahl-Jensen, I.K. Seierstad, M.-L. Siggaard-Andersen, J.P. Steffensen, A.M. Svensson, % J. Olsen, and J. Heinemeier % A synchronized dating of three Greenland ice cores throughout the Holocene % Journ. Geophys. Res., vol. 111, D13102, 2006, doi:10.1029/2005JD006921 % % The dating of the 7.9-14.7 ka b2k part is described in the paper: % S.O. Rasmussen, K.K. Andersen, A.M. Svensson, J.P. Steffensen, B.M. Vinther, H.B. Clausen, % M.-L. Siggaard-Andersen, S.J. Johnsen, L.B. Larsen, D. Dahl-Jensen, M. Bigler, R. R�thlisberger, % H. Fischer, K. Goto-Azuma, M.E. Hansson, and U. Ruth % A new Greenland ice core chronology for the last glacial termination % Journ. Geophys. Res., vol. 111, D06102, 2006, doi:10.1029/2005JD006079 % % The dating of the part below 14.7 ka b2k is described in the two papers: % K.K. Andersen, A. Svensson, S.J. Johnsen, S.O. Rasmussen, M. Bigler, R. R�thlisberger, U. Ruth, % M.-L. Siggaard-Andersen, J.P. Steffensen, D. Dahl-Jensen, B.M. Vinther, and H.B. Clausen % The Greenland Ice Core Chronology 2005, 15-42 ka. Part 1: Constructing the time scale % Quaternary Science Reviews, vol. 25, Shackleton special issue 24, 2006 % % A. Svensson, K.K. Andersen, M. Bigler, H.B. Clausen, D. Dahl-Jensen, S.M. Davies, S.J. Johnsen, % R. Muscheler, S.O. Rasmussen, R. R�thlisberger, J.P. Steffensen, and B.M. Vinther % The Greenland Ice Core Chronology 2005, 15-42 ka. Part 2: Comparison to other records % Quaternary Science Reviews, vol. 25, Shackleton special issue 24, 2006 % % The transferal of GICC05 to the GRIP ice core in the 14.7-32.4 ka part is described in the paper: % Synchronization of the NGRIP, GRIP, and GISP2 ice cores across MIS 2 and palaeoclimatic implications % S.O. Rasmussen, I.K. Seierstad, K.K. Andersen, M. Bigler, D. Dahl-Jensen, and S.J. Johnsen % Accepted, Quat. Sci. Rev., INTIMATE special issue, 2007 % % For more data downloads, go to www.icecores.dk % % Age NGRIP NGRIP GRIP GRIP Max. counting % (yrs depth d18O depth d18O(*) error % b2k) (m) (�) (m) (�) (yrs) 20 7.35 -35.16 5.43 NaN 1 40 14.15 -35.82 13.60 -35.13 1 60 20.40 -35.11 21.43 -35.55 1

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