Herschel Island and the neighboring Mackenzie Delta is a secondary field site in PAGE21. The island is located at 69°34'N and 138°55'W and is the northernmost point of the Yukon Territory, approximately 60 km east of the Alaska border. Herschel Island is part of an ice-push structure formed by the westward advance of a lobe of the Laurentide Ice Sheet during the last glaciation.
Permafrost is relatively thick and, in places along the Yukon Coastal Plain, reaches depths of 600+ m (Smith and Burgess, 2000). Massive ground ice is widespread and underlies most of Herschel Island, except for beaches and spits (Pollard, 1990; Fritz et al., 2011). The mean long-term annual air temperature is -10°C and permafrost temperature at -15 m depth is −8°C (Burn and Zhang, 2009).
The area is characterized by Arctic tundra. There are over 200 species of plants on Herschel Island, which occur in a diversity of habitats. Most of the island is composed of level to gently sloping stable uplands, vegetated by cottongrass, ground shrubs and wildflowers.
The island is the focus of the investigations of the Alfred Wegener Institute for Polar and Marine Research since 2006 in a cooperation with McGill University and the Geological Survey of Canada. These studies have looked at coastal erosion, paleogeography, thermokarst and soil microbiology.
A large number of background documents and data have been acquired about the island and the area, including high resolution satellite imagery, DEMs, archive airphotos, meteorological measurements and soil maps.
The island can be accessed by helicopter, float plane or twin otter from Inuvik. The Twin otter flight lasts approximately one hour. The number of researchers on site varies between a few to fifteen at the same time during the summer period. The island is a territorial park and is being managed by two rangers on site between April and August.