Table 1.
Description of individual samples in this study by sample subtype.
| Sample subtype | # | Samplea | T(°C)b | S (ppt) | Description | Size fraction (µm)c |
|---|---|---|---|---|---|---|
| Massive ice | 1 | CB4_IW1_17 | –6 | 0 | Ice shavings, upper borehole | > 0.2 |
| 2 | CB4_IW2_17 | –6 | 0 | Ice shavings, lower borehole | > 0.2 | |
| Massive ice with brine | 3 | CBIW_IW3_17 | –6 | 7 | Ice core section, upper borehole | > 0.2 |
| 4 | CBIW_IW7_17 | –6 | 22 | Ice core section, lower borehole | > 0.2 | |
| Intra-ice brine | 5 | CBIW_17 | –6 | 140 | Brine, bottom of borehole | 0.2–1.6 |
| 6 | CBIW_18 | –6 | 121 | Brine, bottom of borehole | > 0.2 | |
| 7 | CBIW_re_18 | –6 | 120 | Recharged brine, 4 days later | > 0.2 | |
| Intra-sediment brine | 8 | CB1_0.2_09 | –6 | 115 | Brine, upper borehole | 0.2–3.0 |
| 9 | CB1_3.0_09 | –6 | 115 | Brine, upper borehole | > 3.0 | |
| 10 | CB1_18 | –6 | 122 | Brine, lower borehole | > 0.2 | |
| Intra-sediment brine (other) | 11 | CBIA_surf_18 | –6 | 120 | Brine, borehole surface seepage | > 0.2 |
| 12 | CBIA_18 | –6 | 112 | Brine, lower borehole, slurried with ice crystals, sulfidic odor | > 0.2 | |
| 13 | G2_18 | –6 | 109 | Brine, lower borehole, slurried with sediment | > 0.2 | |
| 14 | CB4_18 | –6 | 121 | Brine, lower borehole | > 0.2 | |
| Sackhole brine from sea ice | 15 | SB_17 | –4 | 78 | Brine, pooled from sackholes | 0.2–1.6 |
| 16 | SB_0.2_18 | –3 | 75 | Brine, pooled from sackholes | 0.2–3.0 | |
| 17 | SB_3.0_18 | –3 | 75 | Brine, pooled from sackholes | > 3.0 | |
| 18 | SB_18 | –3 | 75 | Brine, pooled from sackholes | > 0.2 | |
| 19 | SB1_18 | –3 | 75 | Brine, sackhole #1 | > 0.2 | |
| 20 | SB2_18 | –3 | 75 | Brine, sackhole #2 | > 0.2 | |
| 21 | SB3_18 | –3 | 75 | Brine, sackhole #3 | > 0.2 | |
| 22 | SB4_18 | –3 | 75 | Brine, sackhole #4 | > 0.2 |
a
CB indicates cryopeg borehole; G, borehole intended for geology; SB, sackhole brine; last two digits of sample name, sampling year (2009, 2017, 2018). See Text S1 (Supporting Information) for details of borehole terminology and drilling circumstances; Fig. 1 for tunnel locations of massive ice, permafrost, boreholes, and encountered brine and cryopeg sediment.
b
Temperature in tunnel recorded at tunnel floor; in sea ice, at sackhole depth.
c
Size fractionation indicates whether the sample was collected directly on a 0.2 µm filter (> 0.2) or first prefiltered with a 3.0 or 1.6 µm filter (0.2–1.6 or 0.2–3.0 µm); > 3.0 indicates the sample material collected on the 3.0 µm prefilter.