摘要：We present a 1986 through 2017 estimate of Greenland Ice Sheet ice discharge.Our data include all discharging ice that flows faster than 100myr−1and are generated through an automatic and adaptable method, as opposed toconventional hand-picked gates. We position gates near the present-yeartermini and estimate problematic bed topography (ice thickness) values wherenecessary. In addition to using annual time-varying ice thickness, our timeseries uses velocity maps that begin with sparse spatial and temporalcoverage and end with near-complete spatial coverage and 6d updates tovelocity. The 2010 through 2017 average ice discharge through the flux gatesis ∼488±49Gtyr−1. The 10% uncertainty stems primarilyfrom uncertain ice bed location (ice thickness). We attribute the ∼50Gtyr−1 differences among our results and previous studies to ouruse of updated bed topography from BedMachine v3. Discharge is approximatelysteady from 1986 to 2000, increases sharply from 2000 to 2005, and then isapproximately steady again. However, regional and glacier variability is morepronounced, with recent decreases at most major glaciers and in all but oneregion offset by increases in the NW (northwestern) region. As part of thejournal's living archive option, all input data, code, and results from thisstudy will be updated when new input data are accessible and made freelyavailable at https://doi.org/10.22008/promice/data/ice_discharge.
