Table 1.

Isotopic composition of Ar in ice core trapped gases

CoreDepth, meters below surfaceAge, kaδ38/36Ar. ‰δ40/38Ar − δ38/36Ar, ‰
Vostok BH-5140.320.977−0.008
Siple36050.4590.002
Vostok BH-5158.130.981−0.018
GISP2138.500.627−0.035
Vostok BH-5174.930.990−0.009
MCI-04–011000.038−0.010
Vostok BH-5152.430.932−0.024
Vostok BH-5152.430.9160.009
Vostok BH-5134.120.985−0.005
Vostok BH-5134.120.926−0.004
Vostok BH-5134.120.934−0.002
Vostok BH-5134.120.929−0.019
Vostok 5G1275, 1300860.890−0.001
Vostok 5G1300, 1313870.826−0.022
Vostok 5G1407, 1540, 1560, 15801051.001−0.023
Vostok 5G19751340.912−0.021
Vostok 5G3206, 32093700.963−0.033
Vostok 5G3248, 3252, 32543951.015−0.037
Vostok 5G3306, 33094091.101−0.036
Vostok 5G3315, 33214091.078−0.033
Vostok 5G3330, 33364091.092−0.038
EPICA Dome C3081.19, 3082.24, 3084.476890.848−0.049
EPICA Dome C3095.47, 3097.67, 3098.796980.899−0.053
EPICA Dome C3102.07, 3103.19, 3104.277020.883−0.051
EPICA Dome C3106.54, 3107.54, 3408.747050.876−0.067
EPICA Dome C3110.97, 3111.94, 3113.087090.869−0.074
EPICA Dome C3146.14, 3147.14, 3148.347500.733−0.045
EPICA Dome C3170.34, 3172.55, 3173.54, 3174.747590.926−0.066
EPICA Dome C3150.55, 3151.54, 3152.76, 3169.147790.751−0.059
  • Units: ‰ with respect to air.