Shoreline change rates and land to sea sediment and soil organic carbon transfer in eastern Parry Peninsula from 1965 to 2020 (Amundsen Gulf, Canada)

• Published in: Arctic Science
• Main Authors: Tanguy, Rodrigue, Whalen, Dustin, Prates, Gonçalo, Vieira, Gonçalo
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 2023
• Subjects: Coastal dynamics; Permafrost; Darnley Bay; Carbon fluxes; Remote sensing; Arctic; Canada; Darnley; Parry; Parry Peninsula; Paulatuk; Amundsen Gulf; Beaufort Sea; Climate change; Ice; permafrost
• Online Access: http://hdl.handle.net/10400.1/19403; https://doi.org/10.1139/AS-2022-0028

As the Arctic is warming, permafrost coasts are eroding faster, threatening coastal communities, habitats, and altering sediment and nutrient budgets. The western Canadian Arctic is eroding at a rapid pace; however, little is known on changes occurring in the Amundsen Gulf area. This study was conducted in the eastern coast of Parry Peninsula, a neglected rock dominated coastal area. We used orthorectified aerial photos of 1965 and 1993 and very high-resolution satellite imagery of 2020 to manually delineate the shoreline according to backshore and foreshore centered approaches. Shoreline change rates were calculated and sediment and organic carbon transfer from land to sea estimated using digital elevation model, the Northern Circumpolar Soil Carbon Database, and ground ice content. The results show a mean erosion rate of 0.12 m/yr for the backshore zone and 0.16 m/yr for the foreshore zone, with increasing erosion in the Paulatuk Peninsula in recent decades. The average sediment transfer from land to sea was 20 m3/m/yr and the soil organic carbon (SOC) flux was 7 kg C/m/yr. We highlight the importance of using the cliff-top as shoreline reference to accurately estimate sediment and SOC transfers, an approach neglected in automatic shoreline delineation techniques based on remote sensing imagery using the waterline. Natural Resources Canada; Canadian Forest Service; Climate Change Geoscience Program, Crown-Indigenous Relations and Northern Affairs Canada (CIRNAC) through the Beaufort Sea; Regional Strategic Environment and Research Assessment (BRSEA); European Union's Horizon 2020 Research and Innovation Program; Community of Paulatuk info:eu-repo/semantics/publishedVersion