Subglacial probes Specification

Jan 2002

 

Measurements

Probe

orientation

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

Precision: 5o (20o 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 5oC

Precision: 0.2 (1oC worst case)

external pressure

Estimated range: (assuming 40-60m depth) 400-600 kPa (57-85 psi, 3.85.8 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 25oC (due to sun?)

Precision: 0.2 (1oC 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