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TitleMassive ice control on permafrost coast erosion and sensitivity
AuthorLim, M; Whalen, DORCID logo; Martin, J; Mann, P J; Hayes, S; Fraser, P; Berry, H B; Ouellette, D
SourceGeophysical Research Letters vol. 47, no. 17, e2020GL087917, 2020 p. 1-9, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200448
PublisherBlackwell Publishing Ltd.
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNorthwest Territories
Lat/Long WENS-133.1519 -133.1092 69.4131 69.4028
SubjectsScience and Technology; coastal erosion; massive ice; permafrost
Illustrationslocation maps; graphs; cross-plots
ProgramClimate Change Geoscience Coastal Infrastructure
Released2020 08 21
AbstractHigh 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.

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