SIMB3 2018A was deployed in the Beaufort Sea on 20 March 2018 (U.S. Navy ICEX).

From the SIMB3 V2 geometry, initial snow distance 0.997 m (V2 pinger 1.08 → −0.08); the one valid cold profile has its surface kink at index 42 (→ −0.07). Low confidence

SIMB3 V2 seasonal ice mass balance buoy (early SIMB3, CRREL/Dartmouth program), 192-sensor Bruncin digital temperature chain at 2 cm spacing.

SIMB3 2018A

Dartmouth College

SIMB3 V2 sensor suite (early SIMB3, 192-sensor Bruncin DTC), imported from the CRREL/Dartmouth Live Data page.

DS18B20 air temperature sensor in a radiation shield at the top of the buoy.

MaxBotix MB7374 downward-looking rangefinder: distance to the snow/ice surface. Mounted about 1.00 m above the initial ice surface (surface height = 1.00 − distance).

Airmar upward-looking underwater rangefinder: distance to the ice/ocean interface. Mounted about 3.37 m below the initial ice surface (ice bottom = distance − 3.37).