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TitleRecent warming impacts in the Mackenzie Delta, Northwest Territories, and northern Yukon Territory coastal areas
AuthorWolfe, S A; Kotler, E; Nixon, F M
SourceGeological Survey of Canada, Current Research (Online) no. 2000-B1, 2000, 9 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; (2000). Current Research 2000, Geological Survey of Canada, Current Research (Online) no. 2000-ABCDE
File formatpdf
ProvinceNorthwest Territories; Yukon
NTS107C/06NW; 107C/06NE; 107C/11; 117D/02SW; 117D/03SE
AreaMackenzie Delta; Richards Island; North Head; North Point
Lat/Long WENS-138.2500 -137.7500 69.1667 69.0000
Lat/Long WENS-135.0000 -134.0000 69.7500 69.4167
Subjectsenvironmental geology; temperature; environmental impacts; ice wedges; paleoclimates; subsidence; Quaternary
Illustrationssketch maps; photographs
Released2000 01 01
AbstractIce wedges on northern Richards Island, Northwest Territories, and along the Yukon Territory coastlands, have responded to increased thaw depths. Observations made in 1999 are compared to those last made in these areas in 1975 and 1984, respectively. Climate data indicate that air temperatures in these areas have been warmer than average since 1978 and that warming in 1998 was an extreme event. Increased thaw in response to this warming has caused a decrease in the number of secondary and tertiary ice wedges, and is attributed to thaw truncation. Depths to the tops of ice wedges on Richards Island have increased, whereas depths have decreased on the Yukon Territory coastlands due to thaw consolidation. Thaw-tube observations indicate that 1998 thaw depths were the greatest since 1991 across the northern Mackenzie Delta region, with increases of as much as 21 cm.