{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,3,16]],"date-time":"2025-03-16T04:04:13Z","timestamp":1742097853415,"version":"3.38.0"},"posted":{"date-parts":[[2025,3,15]]},"group-title":"display","reference-count":0,"publisher":"Copernicus GmbH","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Climate warming is driving widespread changes in Arctic permafrost coasts, which comprise about 1\/3 of global coastal areas. The Tuktoyaktuk Peninsula registered average shoreline retreat rates of -0.77 m\/yr from 1950 to 2020, with a 31% increase since 1985. Coastal morphology significantly controlled shoreline evolution trends, with low-lying tundra flats retreating at higher rates. Permafrost-thaw subsidence, coastal erosion, and sea level rise are driving high land loss rates in low-lying permafrost areas. This study uses field and remote sensing methods to assess the factors contributing to permafrost subsidence and degradation on regional and local scales. UAS surveys were conducted in 2023 and 2024 in target low-lying coastal sites along the Tuktoyaktuk Peninsula such as Reindeer Point, Toker Point, Tuft Point and Warren Point. The UAS DSMs were used to derive very high-resolution digital surface models and to quantify short-term changes in target low-lying coastal sites. Sentinel-1-based D-InSAR analysis for the summers of 2019 to 2024 allowed for assessing regional scale and local surface deformations. We analysed the spatial variability of each summer and the interannual differences between them. Results show prevailing regional subsidence in all summers, with the highest values in 2021, where shoreline retreat hotspots such as Tuktoyaktuk Island, Toker Point, and Warren Point displayed more than 40 cm of subsidence. Warren Point registered the highest surface deformation patterns of the UAV surveyed areas between 2023 and 2024, likely due to coastal inundation events that degraded the permafrost and caused thaw subsidence.<\/jats:p>","DOI":"10.5194\/egusphere-egu25-19325","type":"posted-content","created":{"date-parts":[[2025,3,15]],"date-time":"2025-03-15T05:26:19Z","timestamp":1742016379000},"source":"Crossref","is-referenced-by-count":0,"title":["Spatial analysis of summer subsidence in Tuktoyaktuk Peninsula (2019 &amp;#8211; 2024): linking Sentinel-1 D-InSAR and in-situ observations"],"prefix":"10.5194","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4853-1129","authenticated-orcid":false,"given":"Bernardo","family":"Costa","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7611-3464","authenticated-orcid":false,"given":"Gon\u00e7alo","family":"Vieira","sequence":"additional","affiliation":[]},{"given":"Michael","family":"Lim","sequence":"additional","affiliation":[]},{"given":"Dustin","family":"Whalen","sequence":"additional","affiliation":[]}],"member":"3145","container-title":[],"original-title":[],"deposited":{"date-parts":[[2025,3,15]],"date-time":"2025-03-15T05:52:48Z","timestamp":1742017968000},"score":1,"resource":{"primary":{"URL":"https:\/\/meetingorganizer.copernicus.org\/EGU25\/EGU25-19325.html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,3,15]]},"references-count":0,"URL":"https:\/\/doi.org\/10.5194\/egusphere-egu25-19325","relation":{},"subject":[],"published":{"date-parts":[[2025,3,15]]},"subtype":"other"}}