Table 1: Sample depth (meter water equivalent, m weq.) for the Colle Gnifetti (CG) ice-core samples (upper part), sample name for the Jungfraujoch (JFJ) samples (lower part), age of sample, 87Sr/86Sr and 143Nd/144Nd isotopic compositions with 2σ (2 standard errors of the mean), and Nd isotopic ratios expressed as epsilon units.

Sample depth (m weq.)Apparent agea87Sr/86Sr FCb2σ Sr× 10−6143Nd/144Nd FCc2σ Nd × 10−6 (0)d

10.93–10.471974-19750.71977520.51199821−12.5
11.82–10.931971–19740.713703140.512335199−5.9
12.25–11.821970-19710.709416120.511623262−19.8
12.71–12.251968–19700.717248130.51208168−10.9
13.16–12.711967-19680.714732150.511865203−15.1
17.05–15.521952–19580.71698650.51199319−12.6
18.03–17.051948–19520.712315250.51190874−14.2
20.09–18.031939–19480.712284260.512069197−11.1
21.12–20.091934–19390.718733140.51198625−12.7
22.74–21.121926–19340.712936510.511722139−17.9
23.92–22.741919–19260.72062930.51195751−13.3
24.52–23.921916–19190.716637200.512135103−9.8
26.18–24.521906–19160.70949442
27.14–26.181900–19060.72351370.51192918−13.8
28.38–27.141893–19000.713982200.51211040−10.3
29.61–28.381884–18930.715272120.51199953−12.5
30.89–29.611874–18840.71911720.51201111−12.2
31.50–30.891869–18740.714151210.511907108−14.3
34.04–31.501847–18690.711404180.51200555−12.4
36.55–34.041821–18470.71323590.51209017−10.7
38.43–36.551798–18210.711326100.51191144−14.2
39.10–38.431789–17980.716228150.51195625−13.3
39.62–39.261782–17870.72619040.5119678−13.1
41.57–39.621751–17820.711900150.51196872−13.1
42.81–41.571729–17510.71284260.51238228−5.0
43.43–42.811717–17290.71227720
44.06–43.431704–17170.710148230.511809118−16.2
44.70–44.061690–17040.711321160.51195043−13.4
45.33–44.701675–16900.712921630.51197553−12.9
45.93–45.331660–16750.716865340.51206646−11.2
46.59–45.931642–16600.715511100.51199031−12.6
47.20–46.591624–16420.709537150.51216999−9.1
47.81–47.201605–16240.712651200.51199566−12.6
48.42–47.811585–16050.712811300.51185662−15.2
49.04–48.421563–15850.715854110.51196457−13.2
50.20–49.041514–15630.712714370.512184245−8.9
50.62–50.201495–15140.7148211690.51177143−16.9
51.91–50.621427–14950.71586450.51194935−13.4
54.92–53.731187–13000.71738010.51205114−11.5
A25.06.20080.71031120.51195822−13.3
B07.08.20080.713474240.51208875−10.7
C09.09.20080.71094650.51201210−12.2
D10.09.20080.71085910.5120424−11.6
E12.10.20090.71060050.51206319−11.2
F14.10.20090.71072850.5120089−12.3
G13.05.20090.71074020.51208827−10.7
H24.05.20090.71043010.51206433−11.2
I28.05.20080.70973780.5120408−11.7
J01.06.20080.71057040.51205721−11.3
K11.09.20080.71114030.5120186−12.1
L13.10.20080.71298150.51203620−11.7

aThe apparent age is calculated by the age model and used to plot the results. Difference between absolute and apparent ages is discussed in the text, based on ice core absolute date (e.g., Laki volcanic layer) and radiocarbon dating.
bAll values corrected for internal mass fractionation by normalizing to 86Sr/88Sr = 0.1194 and for external fractionation by normalizing the measured SRM987 values to a SRM987 nominal value of 0.710248.
cAll values corrected for internal mass fractionation by normalizing to 146Nd/144Nd = 0.7219 and for external fractionation by normalizing the measured Jndi-1 values to a Jndi-1 value of 0.512115 [18].
dCalculated for a present-day CHUR value of 143Nd/144Nd = 0.512638 [19].