Table 2 In situ 14C concentrations and ice cover simulations

From: Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years

     

Continuous Holocene coverage

Site #

Elevation (m)

14C conc. (at g−1)

± (at g−1)

Max. exposure prior to 4.5 ka (kyr)

Holocene ice thickness (m)

Peak LIA ice thickness (m)

2

1478

7000

1500

0

26 (18–36)

50 (29–70)

3

1478

105,800

4000

0

1 (1–2)

9 (3–11)

7

1522

65,200

3500

0

2 (2–3)

18 (5–24)

11

1255

49,300

3500

0

2 (2–3)

33 (6–49)

12

1389

45,700

3600

0

3 (2–4)

17 (5–70)

13

1588

20,900

3400

0

6 (4–13)

29 (10–70)

21

1390

73,000

3700

0

1 (1–2)

67 (6–70)

23

1436

133,400

6400

5

1 (1–1)

4 (4–4)

25

1526

18,500

3300

0

7 (4–15)

29 (11–70)

aa

1010

368,800

7100

N/A

N/A

N/A

  1. In situ 14C concentrations at 9 of the 30 sites with >40 ka plant ages and the results of the Holocene ice cover simulations. Ice thicknesses are reported as the median and range of values consistent with measured in situ 14C and its analytical error. Sample a is a steep-sided summit that has likely never been glaciated, and so is not included in the ice cover simulations
  2. LIA Little Ice Age
  3. aCoastal summit bedrock under constant exposure (Holocene ice cover simulations inappropriate), reported for comparison.
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