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Groundwater and Soil Moisture Conditions from GRACE Data Assimilation L4 7-days 0.125 x 0.125 degree V2.0 (GRACEDADM_CLSM0125US_7D) at GES DISC

Scientists at NASA Goddard Space Flight Center generate groundwater and soil moisture drought indicators each week. They are based on terrestrial water storage observations derived from GRACE satellite data and integrated with other observations, using a sophisticated numerical model of land surface water and energy processes. GRACE Data Assimilation for Drought Monitoring (GRACE-DA-DM) Version 2.0 data product is based on the Catchment Land Surface Model (CLSM) Fortuna 2.5 version simulation that was created by the Land Information System (LIS) data assimilation framework, using the latest gridded GRACE solutions of the University of Texas at 0.5 degree resolution. On the other hand, Version 1.0 was created by the stand alone CLSM (an older version) using the GRACE-Tellus 1 degree data from the Center for Space Research at University of Texas. The GRACE data assimilation (DA) is executed on grid-to-grid basis in Version 2.0 (Kumar et al. 2016), while basin scale average was used in Version 1.0 (Zaitchik et al. 2008). The simulation upgrades includes fixes in the DA and increased bedrock depth by 3 meters to enhance the drought indicator calculations. This data set contains three drought indicator variables: Groundwater Percentile, Root Zone Soil Moisture Percentile, and Surface Soil Moisture Percentile, which are derived from the outputs of the GRACE Catchment Land Surface Model Data Assimilation. The wetness percentiles are relative to the period 1948-2009. The drought indicator data are daily, but available only one-day (Monday) per week, in 0.125 x 0.125 degree over North America, from April 1, 2002 to present (with 3-6 months latency). The data files are in NetCDF format.

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