This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party. This image was taken after the helicopter turned north to return to base camp.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.

This image is part of the outbound sequence of aerial images obtained on the helicopter flight to the Klutlan Glacier study site. The sequence starts from the base camp at the White River crossing on the Alaska Highway and heads south, to a point just upvalley of the debris-covered terminus (approx. 10-15 km from Alaska border), and turning back north to the landing spot on the Generc River floodplain close to the study site (see Fig. 1 in paper).

This image is part of the return trip sequence of aerial images obtained on the helicopter flight leaving the Klutlan Glacier study site. On the return leg at the end of the day, the flight initially went upvalley to pick up another party.