{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T01:47:56Z","timestamp":1769046476422,"version":"3.49.0"},"reference-count":57,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2024,6,28]],"date-time":"2024-06-28T00:00:00Z","timestamp":1719532800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Geoscience Department at Williams College"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Erosion along the coastline of the Alaskan Arctic poses an existential threat to several communities. Rising air temperatures have been implicated in accelerating erosion rates through permafrost thaw, decreasing sea ice cover (increasing ocean fetch and wave energy), and shortening the duration of a shore-fast ice buffer, which all mean that erosion rates are higher in summer than they are in winter. However, the resolution of available satellite imagery has historically been too low to allow for the quantification of seasonal erosion rates across large areas of the Arctic, and so erosion rates are generally measured at annual to decadal time scales. This study uses PlanetScope high-resolution satellite imagery to calculate seasonal erosion rates in the Alaskan Arctic. Erosion rates as high as 38 cm\/day (equivalent to 140 m\/year) were measured using twice-annual images from 2017\u20132023 on two stretches of Alaska\u2019s Beaufort Sea coast: Drew Point and Cape Halkett. The highest erosion rates are measured in the summer, with winter erosion rates consistently below 10 cm\/day (usually within error margin of zero) and summer erosion rates exceeding 20 cm\/day in three out of the seven years of data. Summer erosion rates are shown to correlate well with local air temperatures in July\u2013September, July sea surface temperatures, and with Beaufort Sea sea ice area in May\u2013August. Wind speeds and number of windy days do not correlate well with summer erosion rates. This study demonstrates the feasibility of using PlanetScope imagery to calculate erosion rates at seasonal time resolution without field measurements and shows the magnitude of difference between summer and winter season erosion rates.<\/jats:p>","DOI":"10.3390\/rs16132365","type":"journal-article","created":{"date-parts":[[2024,6,28]],"date-time":"2024-06-28T06:51:53Z","timestamp":1719557513000},"page":"2365","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Seasonal Coastal Erosion Rates Calculated from PlanetScope Imagery in Arctic Alaska"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9710-0010","authenticated-orcid":false,"given":"Galen","family":"Cassidy","sequence":"first","affiliation":[{"name":"Geoscience Department, Williams College, Williamstown, MA 01267, USA"},{"name":"Department of Psychology, The University of Texas at Austin, Austin, TX 78712, USA"}]},{"given":"Matthew","family":"Wiseman","sequence":"additional","affiliation":[{"name":"Geoscience Department, Williams College, Williamstown, MA 01267, USA"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3230-4358","authenticated-orcid":false,"given":"Kennedy","family":"Lange","sequence":"additional","affiliation":[{"name":"Geoscience Department, Williams College, Williamstown, MA 01267, USA"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-2161-4764","authenticated-orcid":false,"given":"Claire","family":"Eilers","sequence":"additional","affiliation":[{"name":"Geoscience Department, Williams College, Williamstown, MA 01267, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6953-5260","authenticated-orcid":false,"given":"Alice","family":"Bradley","sequence":"additional","affiliation":[{"name":"Geoscience Department, Williams College, Williamstown, MA 01267, USA"}]}],"member":"1968","published-online":{"date-parts":[[2024,6,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"364","DOI":"10.1038\/nclimate3252","article-title":"Managed retreat as a response to natural hazard risk","volume":"7","author":"Hino","year":"2017","journal-title":"Nat. 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