Installation of sampler network (prior to experiment, since
associated with hydraulic disturbance)
Release of fluorescent tracers (point or layer source) and
sampling of liquid phase and solid ice at regular intervals
Fluorometric detection (over >6 orders of magnitude in
concentration) or direct mapping of tracer
front
Tracers employed: Fluoresceine
(low detection limit, non-adsorptive, decay in UV light on scale
of days), Sulforhodamine (medium DL,
non-adsorptive, stable), Rhodamine
(medium DL, adsorptive, stable)
"Passive"
tracers
Contrast between stable-isotopic composition of snow and
sea-ice (d18O of -24.1+/-4.0
‰ and -1.9+/-0.5 ‰, resp.) may allow for detection of
transient snow-melt
signal in melt ponds and within the ice matrix
Derivation of linear mixing model based on snow and ice/water
isotopic measurements; sampling of liquid phase and solid ice
Ancillary
measurements
In-situ permeability measurements
Measurements of ice temperature, salinity (and rudimentary
structural stratigraphy)
Determination of ice surface morphology and associated
hydraulic gradients
Non-invasive ice thickness measurements (in collaboration with
W. B. Tucker, CRREL, Hanover, NH)
Ice ablation measurements (as part of SHEBA sea-ice
program)