GRIP Depth Age by Stratigraphy

REFERENCES:

Hammer, C.U., K.K. Andersen, H.B. Clausen, D. Dahl-Jensen, C.S. Hvidberg,
and P. Iversen. 1997. The stratigraphic dating of the GRIP ice core.
Special Report of the Geophysical Department, Niels Bohr Institute for
Astronomy, Physics and Geophysics, University of Copenhagen.

Johnsen, S.J., H.B. Clausen, W. Dansgaard, N.S. Gundestrup, C.U. Hammer, U.
Andersen, K.K. Andersen, C.S. Hvidberg, D. Dahl-Jensen, J.P. Steffensen, H.
Shoji, A.E. Sveinbjörnsdóttir, J.W.C. White, J. Jouzel, and D. Fisher.
1997. The d18O record along the Greenland Ice Core Pproject deep ice core
and the problem of possible Eemian climatic instability. Journal of
Geophysical Research 102:26397-26410.

Johnsen, S.J., H.B. Clausen, W. Dansgaard, N.S. Gundestrup, C.U. Hammer,
and H. Tauber. 1995. The Eem stable isotope record along the GRIP ice core
and its interpretation. Quaternary Research 43:117-124.

Dahl-Jensen, D., S.J. Johnsen, C.U. Hammer, H.B. Clausen, and J. Jouzel.
1993. Past accumulation rates derived from observed annual layers in the
GRIP ice core from Summit, Central Greenland. NATO Advanced Sciences
Institutes Series 1:12. Springer-Verlag, Berlin, Heidelberg.

DATA DESCRIPTION:

This file shows ages and depths and average accumulation rates related to
significant climatic changes over the past 60 ka in the GRIP ice core. 
The ages and the names of climate intervals are based on stratigraphy
(Hammer et al., 1997), rather than the flow-model of Johnsen et al.
(1997).  The latter timescale is presented in gripage.dat.  Ages are BP
1950. 

DATA:

depth	depth	average accumulation	length of	age	age	name of interval
top (m)	bottom (m)	rate (cm/yr)	interval (yr)	top (m)	bottom (m)	

1616.45	1623.60	6.79	109	11402	11511	Preboreal
1623.60	1662.65	3.27	1194	11511	12705	Younger Dryas
1662.65	1718.20	3.88	1432	12705	14137	Allerod
1718.20	1752.85	4.71	736	14137	14873	Bolling (IS1)
1752.85	1940.40	2.15	8743	14873	23616	C1
1940.40	1951.95	2.44	474	23616	24090	IS2 (a+b)
1951.95	2017.95	1.63	4041	24090	28131	C2
2017.95	2025.65	2.11	365	28131	28496	IS3
2025.65	2037.75	1.33	912	28496	29408	C3
2037.75	2046.00	2.10	392	29408	29800	IS4
2046.00	2090.00	1.19	3691	29800	33491	C4
2090.00	2099.90	2.14	463	33491	33954	IS5
2099.90	2111.45	1.17	983	33954	34937	C5
2111.45	2118.60	2.29	312	34937	35249	IS6
2118.60	2131.80	1.46	904	35249	36153	C6
2131.80	2149.40	2.17	812	36153	36965	IS7
2149.40	2162.60	1.16	1134	36965	38099	C7
2162.60	2200.55	2.17	1748	38099	39847	IS8
2200.55	2220.90	1.28	1596	39847	41443	C8
2220.90	2223.65	1.95	141	41443	41584	IS9
2223.65	2234.10	1.35	775	41584	42359	C9
2234.10	2243.45	1.89	496	42359	42855	IS10
2243.45	2252.25	1.38	638	42855	43493	C10
2252.25	2270.95	1.89	990	43493	44483	IS11
2270.95	2297.35	1.02	2590	44483	47073	C11
2297.35	2324.30	1.33	2029	47073	49102	IS12
2324.30	2343.55	0.95	2024	49102	51126	C12
2343.55	2350.70	1.23	581	51126	51707	IS13
2350.70	2380.95	1.13	2676	51707	54383	C13
2380.95	2421.10	1.37	2937	54383	57320	IS14
2421.10	2431.00	0.92	1081	57320	58401	C14
2431.00	2435.95	1.22	407	58401	58808	IS15
2435.95	2441.45	0.82	667	58808	59475	C15