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. We describe new Last Glacial Maximum (LGM) icethickness constraints for three locations spanning the Weddell Sea Embayment(WSE) of Antarctica. Samples collected from the Shackleton Range, PensacolaMountains, and the Lassiter Coast constrain the LGM thickness of the SlessorGlacier, Foundation Ice Stream, and grounded ice proximal to the modernRonne Ice Shelf edge on the Antarctic Peninsula, respectively. Previousattempts to reconstruct LGM-to-present ice thickness changes around the WSEused measurements of long-lived cosmogenic nuclides, primarily 10Be . Anabsence of post-LGM apparent exposure ages at many sites led to LGMthickness reconstructions that were spatially highly variable andinconsistent with flow line modelling. Estimates for the contribution of theice sheet occupying the WSE at the LGM to global sea level sincedeglaciation vary by an order of magnitude, from 1.4 to 14.1 m of sea levelequivalent. Here we use a short-lived cosmogenic nuclide, in situ-produced 14C , which is less susceptible to inheritance problems than 10Be and other long-lived nuclides. We use in situ 14C to evaluate thepossibility that sites with no post-LGM exposure ages are biased bycosmogenic nuclide inheritance due to surface preservation by cold-based iceand non-deposition of LGM-aged drift. Our measurements show that the SlessorGlacier was between 310 and up to 655 m thicker than present at the LGM. TheFoundation Ice Stream was at least 800 m thicker, and ice on the LassiterCoast was at least 385 m thicker than present at the LGM. With evidence forLGM thickening at all of our study sites, our in situ 14C measurementsindicate that the long-lived nuclide measurements of previous studies wereinfluenced by cosmogenic nuclide inheritance. Our inferred LGMconfiguration, which is primarily based on minimum ice thickness constraintsand thus does not constrain an upper limit, indicates a relatively modestcontribution to sea level rise since the LGM of < 4.6 m, andpossibly as little as

New Last Glacial Maximum ice thickness constraints for the Weddell Sea Embayment, Antarctica