Characteristics of the sea-ice (sackhole) brine samples used for choline experiments
aRecorded at time of sackhole drilling
bRange of temperatures recorded for the upper sections of the “physical” ice core corresponding with the potential brine drainage zone
cMean of duplicate samples
dThese ice temperatures appear anomalously warm relative to sackhole brine salinity as the ice cores were collected later in the day (after sackhole drilling) when air temperature was −3.5°C on 18 March and −7.3°C on 21 March.
eThis site had been cleared of snow 3 days prior (note highest brine salinity in the absence of an insulating snow cover), although wind had created snow drifts (10–35 cm) on a portion of the drilling site.