Subglacial probes – Specification

Jan 2002

Measurements

Probe

orientation

Estimated range: 0^o /day to 45^o /day (unknown!)

Precision: ±5^o (±20^o worst case)

position

Estimated movement: 10cm/day in summer max, possibly 1cm/day in winter.

Precision: ±15cm (±30cm worst case)

temperature

Estimated range -5 to 5^oC

Precision: ±0.2 (±1^oC worst case)

external pressure

Estimated range: (assuming 40-60m depth) 400-600 kPa (57-85 psi, 3.8–5.8 atm)

Precision: 1psi (?)

stress

Used as a guide only this time – needs estimating

Surface reference point – ie base station

Position- relative to rock base

Estimated movement: 30cm/day summer, possibly 13m / year

Precision: 10cm worst case?

Temperature

Estimated range: -20 (?) to 25^oC (due to sun?)

Precision: ±0.2 (±1^oC worst case)

Light

Non-calibrated level – to indicate snow-cover (and solar power potential?)

DGPS

Ground

station

Ice

Sediment

13m

10m

7m

3m

Movement in a year

Base Station