Table 1 Radiocarbon dates from sediment cores discussed in the text

From: Ocean driven retreat of the Northeast Greenland Ice Stream following the Last Glacial Maximum

Lab code

Depth (cm)

Material

14C age ± 1σ (yrs BP)

Calibrated Age using (cal yrs BP)(2σ upper and lower range)

ΔRGS20

Calibrated Age GS (cal yrs BP) (2σ upper and lower range)

Calibrated age combined range and median

PS100-144

UCIAMS-210585

72–73

Mixed benthic foraminifera

9370 ± 70

10,003 (9663–10,271)

   

SUERC-76494

104–105

Mixed benthic foraminifera

13,622 ± 44

15,586 (15,284–15,887)

832 ± 66

14,361 (14,046–14,771)

14,966 (14,046–15,887)

UCIAMS-210586

174–175

Mixed benthic foraminifera

16,520 ± 120

19,042 (18705–19420)

832 ± 66

18,184 (17,800–18,572)

18,610 (17,800–19,420)

PS100-146

UCIAMS-216441

72–73

Mixed benthic foraminifera

10,005 ± 30

10,896 (10,698–11,086)

   

SUERC-79058

288–289

Mixed benthic foraminifera

13,453 ± 46

15,365 (15,081–15,656)

832 ± 66

14076 (13,779–14,418)

14,718 (13,779–15,656)

UCIAMS-211064

333–334

Mixed benthic foraminifera

13,790 ± 50

15,810 (15,508–16,114)

832 ± 66

14,653 (14,265–15,001)

15190 (14,265–16,114)

  1. Estimation of marine reservoir correction follows the approach outlined for polar regions in Heaton et al. (2023). The local reservoir correction (ΔR) and error (ΔRerror) for marine reservoir correction used in calibrating Holocene-aged samples is estimated based on average of 8 nearest points from the radiocarbon reservoir correction database (Reimer and Reimer, 2001) giving a value for the local Holocene reservoir correction (ΔRHol20) of 2 ± 66. For pre-Holocene samples the maximal 14C glacial depletion is taken from Heaton et al. (2023) and added to ΔRHol20 to produce the glacial correction (ΔRGS20). We then use the combined range and median age of that range in the discussion.
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