Bylot Island IcefieldThe 120km-long icefield is an undulating elongate plateau feeding most of the valley glaciers on the island. It is sustained by snowfall at the unusually high altitude. Several nunataks pierce the icefield, comprising frost-shattered rock rather than steep cliffs. Overall, there are few visible crevasses, and along with the state of health of its outlet glaciers, it is no longer in equilibrium with the warming climate. |
 Aerial view of a small segment of the icefield, illustrating ice-draped mountains that in a few places reveal bedrock. |  A ridge line separating two glacier basins, with the influence of wind on deposition of snow being obvious – the prevailing wind was towards the right in this photo. |  The icefield feeds many glacier basins, bounded by prominent peaks forming a relatively mild ‘alpine’ topography. |  Some peaks project through the icefield as nunataks. The highest reach around 2000 metres, and these areas are sustaining the outlet glaciers from the icefield, albeit at a declining rate. |
 Brian Moorman approaches his meteorological station which he established to monitor the state of health of the glaciers at high altitude. |  Heavy snowfall during the previous winter has raised the surface to near-instrument level, and some digging out was required. |  Richard Waller digging for buried instruments. |  A nunatak projects above the icefield and the gneiss bedrock here has been subject to long exposure to weathering, notably frost-action. |