Paper No. 4
Presentation Time: 9:00 AM
THE CONTRIBUTION OF GROUNDWATER DEPLETION TO GLOBAL MEAN SEA LEVEL RISE
The contribution of groundwater depletion to Global Mean Sea Level Rise (GMSLR) is an important topic and source of great uncertainty in the GMSLR budget. This research uses gridded GRACE Tellus satellite data to quantify changes in total land water storage, including those of groundwater. Global Land Data Assimilation System land components such as soil moisture, canopy moisture, and snow, are subtracted from the GRACE data to isolate the groundwater component. The resulting trends show that most continents are gaining in groundwater storage, which is consistent with GRACE-based estimates of zero-to-increasing changes in total land water. Results indicate a negative contribution to current rates of GMSLR for the GRACE time period, which is in contrast to the long term, positive contribution identified in recent studies.