A new global mascon solution focused on land ice evolution

A new global mascon solution has been developed with 1-arc-degree spatial and 10-day temporal sampling. The global mascons are estimated directly from the reduction of 8 years of GRACE K-band range-rate data. Temporal and anisotropic spatial constraints have been applied for land, ocean and ice regions. The solution construction and tuning is focused towards the Greenland and Antarctic ice sheets (GIS and AIS) as well as glaciers (e.g. Gulf of Alaska mountain glaciers) and ice caps. Details of the solution development will be discussed, including the mascon parameter definitions, and tuning of constraints. Results will be presented, exploring the spatial and temporal variability of the ice sheets and glacier regions. A detailed error analysis will be discussed, including solution dependence on iteration, constraints, forward modeling, and multi-technique comparisons. We also investigate the fundamental temporal and spatial resolution of the solution and the spatial correlation of ice sheet inter-annual change.