| Title | Massive ice control on permafrost coast erosion and sensitivity |
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| Author | Lim, M; Whalen, D ; Martin, J; Mann, P J; Hayes, S; Fraser, P; Berry, H B; Ouellette, D |
| Source | Geophysical Research Letters vol. 47, no. 17, e2020GL087917, 2020 p. 1-9, https://doi.org/10.1029/2020GL087917  Open Access |
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| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200448 |
| Publisher | Blackwell Publishing Ltd. |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Northwest Territories |
| Area | Canada |
| Lat/Long WENS | -133.1519 -133.1092 69.4131 69.4028 |
| Subjects | Science and Technology; coastal erosion; massive ice; permafrost |
| Illustrations | location maps; graphs; cross-plots |
| Program | Climate Change Geoscience Coastal Infrastructure |
| Released | 2020 08 21 |
| Abstract | High overall rates of permafrost cliff retreat, coupled with spatial variability, have been accompanied by increased uncertainty over future landscape dynamics. We map long-term (>80 years) retreat of
the shoreline and photogrammetrically analyze historic aerial imagery to quantify the processes at a permafrost coast site with massive ground ice. Retreat rates have been relatively constant, but topographic changes show that subsidence is a
potentially critical but often ignored component of coastal sensitivity, exceeding landward recession by over three times during the last 24 years. We calibrate novel passive seismic surveys along clear and variable exposures of massive ground ice
and then spatially map key subsurface layers. Combining decadal patterns of volumetric change with new ground ice variation maps enables past trends to be interpreted, future volumetric geomorphic behavior to be better constrained, and improves the
assessment of permafrost coast sensitivity and the release of carbon-bearing material. |
| GEOSCAN ID | 327265 |
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