IMB 2004A was deployed in the Central Arctic on 25 April 2004 in multiyear ice (NPEO).

From the archive's thermistor depth labels.

Ice mass balance buoy (IMB) from the CRREL/Dartmouth program.

IMB 2004A

Cold Regions Research and Engineering Laboratory

Time of the record in Unix format (seconds since 1970-01-01 UTC).

Derived, not measured directly: the distance between the snow/ice interface, from the acoustic snow sounder (Campbell Scientific SR50) above the ice, and the ice/ocean interface, from the sonar altimeter (Benthos PSA-916) below it, using the fixed distance between the two sounders. Processed by the CRREL/Dartmouth program.

Derived from the acoustic snow sounder (Campbell Scientific SR50) mounted above the surface: snow surface minus the snow/ice interface. Processed by the CRREL/Dartmouth program.

Air temperature (Campbell Scientific CS107 probe) in a radiation shield above the ice.

Snow/ice interface from the acoustic snow sounder (Campbell Scientific SR50); moves down with surface melt. Height relative to the ice surface at installation (0 m, up positive).

Ice/ocean interface from the sonar altimeter (Benthos PSA-916); moves with bottom growth and melt. Height relative to the ice surface at installation (0 m, up positive).

Thermistor 1 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 2 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 3 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 4 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 5 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 6 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 7 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 8 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 9 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 10 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 11 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 12 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 13 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 14 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 15 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 16 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 17 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 18 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 19 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 20 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 21 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 22 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 23 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 24 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 25 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 26 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 27 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 28 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 29 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 30 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 31 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 32 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 33 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 34 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 35 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 36 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 37 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 38 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 39 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 40 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.

Thermistor 41 of 41 on the three thermistor strings, counted down from the top (10 cm spacing). Its height relative to the ice surface depends on the installation: see this deployment's thermistor depths.