Assessment of depositional ash loadings from the 2009 eruption of Mt. Redoubt

摘要: Abstract Volcanic ash deposited onto ice and snow in the Arctic has potential to perturb regional radiation balance by altering surface reflectivity. In order determine changes albedo, loading fields of deposits must be quantified. Loading are defined as total mass over an area. We assessed areal extent from 2009 eruption Mt. Redoubt using Eulerian volcanic transport dispersion model, Fall3D, combined with satellite deposit observations. Because direct observations often limited remote regions, we devised a novel method for modeling entire based on best-fit parameters well-studied eruptive event. The major land-depositing events (events 2–6 March 23–24) were chosen analyses. Realistic ranges model selected well-described event 5 (March 23) estimated other events. results validated against NASA A-train data field measurements reported Alaska Volcano Observatory. Overall, good moderate agreement was found. A cumulative area 3.7 × 106 km2 produced, loadings ranged ~ 7000 ± 3000 g m− 2 near vent