
The ACORN series is a monthly online seminar series by PerCS-Net members on topics related to Arctic coastal research. Become a PerCS-Net member to receive links to join the online conversation. Talks are scheduled for the last Wednesday of the month (September to May) at 1 p.m. Eastern Time.
We are looking for presenters for 2023-24! Please contact us if you would like the opportunity to share your work. We are looking for talks from a broad range of disciplines and career stages. See below for examples of past presentations.
Up Next
27 September 2023 | Watch @1 pm Eastern Time
Thermal phenology of Beaufort Sea Lagoons: 1982-2022
Past Talks
24 May 2023 | Watch Passcode: @D#Sz=?6 (Tip: if pasting the passcode doesn’t work, try typing it in)
Invasive Vaucheria aff. compacta (Xanthophyceae) and its distribution over a high Arctic tidal flat in Svalbard – How microorganisms affect large-scale changes within intertidal systems and protect sea shore ecosystems against erosion
29 March 2023 | Watch passcode: A^B@7×1+ (Tip: if pasting the passcode doesn’t work, try typing it in)
22 February 2023 | Watch (passcode: AVt96%zr)
25 January 2023 | Watch
Glacial isostatic adjustment speeds past and future Arctic subsea permafrost thaw
Roger Creel, Frederieke Miesner,Stiig Wilkenskjeld, Jacqueline Austermann, Pier Paul Overduin
ABSTRACT: Subsea permafrost forms when sea-level rise submerges terrestrial permafrost in the Arctic. Although year-round sea ice has until recently hindered measurement of subsea permafrost distribution, best estimates indicate that over 2.5 million km2 of permafrost exists under the Arctic continental shelf, with some areas of the Laptev and Kara seas underlain by permafrost that is more than 700 meters thick. Understanding subsea permafrost is important because it stores organic carbon and methane, which, if thawed, may reach the atmosphere as greenhouse gasses. Sea-level variations control subsea permafrost distribution. Yet to date, no subsea permafrost model has included local sea level that differs from the global mean due to glacial isostatic adjustment (GIA). Here we present the first model of pan-Arctic subsea permafrost over the last 400,000 years to incorporate GIA. This model allows us to estimate present-day subsea permafrost extent and explore the effect that relative sea level has on permafrost evolution. Additionally, we extend the subsea permafrost simulation 1000 years into the future for the emissions scenarios outlined in the International Panel on Climate Change’s sixth assessment report. Our future projections enable us to map the vulnerability of Arctic subsea permafrost to climate warming.