Terrestrial Water Storage Anomalies

Terrestrial Water Storage (TWS) variability as observed by GRACE/GRACE-FO is an integrated signal from a number of different processes. The GravIS TWS Level-3 products represent anomalies relative to the long-term mean over the period 2002/04 through 2020/03, provided in terms of cm of equivalent water height.

Gridded TWS Level-3 products are displayed in the spatial plot. These products contain several individual variables which can be selected by clicking on the respective name of a particular variable next to the spatial plot, or by using the corresponding pulldown menu in the spatial plot. The gridded products, provided in NetCDF format, can be downloaded from the ISDC archive, either based on gravity field time series from GFZ or COST-G .

For each selected variable, globally averaged anomalies as well as averaged anomalies for certain regions are displayed in the time series plot. Use the corresponding pulldown menu in the spatial plot to select between two types of predefined regions: river basins or climatically similar regions (regions with similar precipitation properties). Click on the spatial plot to select a particular region. Note that TWS uncertainty estimates for regional averages (except global average) are not simply derived from the grid point uncertainties, but modelled according to Boergens et al. (2022). All available regional averaged TWS time series, provided as CSV files, can be directly downloaded from this site by clicking on the download button above the time series plot.

Further information on the TWS data products and the applied processing scheme is available here as technical note.

GRACE: Water storage

Water mass anomalies expressed in terms of equivalent water height from all water storage compartments including snow, surface water, soil moisture, and deep groundwater; not corrected for spatial leakage.

GRACE: Water storage uncertainty

Time-variable component of the uncertainty estimate for the GRACE-based water storage variability, given as standard deviation per grid point.

GRACE: Spatial leakage

Terrestrial water storage variations likely caused by spatial leakage; intended as optional correction for the water storage component.

Model: Atmospheric mass

Atmospheric mass variability as represented in the non-tidal de-aliasing model AOD1B expressed in terms of equivalent water height.


Eva Boergens (boergens (at) gfz-potsdam.de)

Citation of Data:

Level-3 products based on GFZ RL06:

Boergens, Eva; Dobslaw, Henryk; Dill, Robert, 2019:
GFZ GravIS RL06 Continental Water Storage Anomalies. V. 0005
GFZ Data Services, https://doi.org/10.5880/GFZ.GRAVIS_06_L3_TWS

Level-3 products based on COST-G RL01:

Boergens, Eva; Dobslaw, Henryk; Dill, Robert, 2020:
COST-G GravIS RL01 Continental Water Storage Anomalies. V. 0005
GFZ Data Services, https://doi.org/10.5880/COST-G.GRAVIS_01_L3_TWS


Boergens, E., Kvas, A., Eicker, A., Dobslaw, H., Schawohl, L., Dahle, C., Murböck, M., Flechtner, F., 2022:
Uncertainties of GRACE-Based Terrestrial Water Storage Anomalies for Arbitrary Averaging Regions
Journal of Geophysical Research: Solid Earth, 127, 2, e2021JB022081, https://doi.org/10.1029/2021JB022081