Dynamic (in)stability of Thwaites Glacier, West Antarctica

摘要: [1] Thwaites Glacier, West Antarctica, has the potential to directly contribute ∼1 m sea level and currently is losing mass thinning rapidly. Here, we report on regional results for Sea-level Response Ice Sheet Evolution (SeaRISE) experiments investigate impact of i) spatial resolution within existing data sets, ii) grounding-zone processes, iii) till rheology dynamics this outlet glacier. In addition SeaRISE use detailed aerogeophysical satellite from Thwaites Glacier as input a coupled ice stream/ice-shelf/ocean-plume model that includes oceanic influences across several kilometers wide grounding zone suggested by new, high-resolution data. Our indicate tongue provides limited stability, while future atmospheric warming will likely add surface glacier, strong stream stabilization bedrock highs narrower than length may be ephemeral if circulating waters substantially reduce basal resistance enhance melting beneath grounded zone. However, find stability significantly enhanced effectively plastic beds. Accurate projections change relies correct understanding well local processes near line.