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Groundwater Drought Indicator

While the GRACE mission was active, scientists at NASA’s Goddard Space Flight Center generated groundwater and soil moisture drought indicators like this every week from GRACE data on terrestrial water storage and other observations, using a numerical model of land surface water and energy processes.

This map from September 2015 shows deep drought in California, Nevada and Texas. While the GRACE mission was active, scientists at NASA’s Goddard Space Flight Center generated groundwater and soil moisture drought indicators like this every week from GRACE data on terrestrial water storage and other observations, using a numerical model of land surface water and energy processes. They will resume producing maps when GRACE-FO data are available.

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NDMC

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The GRACE Intermediate Field 48 (GIF48 from UT-CSR) field model is an improved mean gravity field that combines GRACE observations and terrestrial gravity information The terrestrial gravity information was taken from the DTU10 global gravity field. Shown here are the so-called free air gravity deviations from an ideal ellipsoidal Earth model, in units of milli-gal. Areas colored yellow, orange, or red are areas where the actual gravity field is larger than the featureless-Earth model predicts, while the progressively darker shades of blue indicate places where the gravity field is less.
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The GRACE-FO satellites are nearly identical. The Microwave Interferometer (MWI) will measure the minute variations in distance between the spacecraft.
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The GRACE-FO satellites are nearly identical. The Microwave Interferometer (MWI) will measure the minute variations in distance between the spacecraft.
GRACE-FO Instruments
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GRACE-FO will measure Atlantic Ocean bottom pressure as an indicator of deep ocean current speed, as GRACE did. This pattern of above-average (blue) and below-average (red) seafloor pressure in 2009 GRACE data revealed a temporary slowing of deep ocean currents.
Ocean Bottom Pressure
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Video for the GRACE-FO mission.
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Changes in Australia's mass observed by GRACE in 2010 and 2011. Areas in greens and blues had the greatest increases in mass, caused by unusually high precipitation connected with a large La Niña e...
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Changes in Australia's mass observed by GRACE in 2010 and 2011. Areas in greens and blues had the greatest increases in mass, caused by unusually high precipitation connected with a large La Niña event.
Changes in Australia's Mass Observed by GRACE in 2010 and 2011
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GRACE data over the United States, 2003-2012
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Gravity variations studied by GRACE can be used to determine ground water storage on land masses. 
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Gravity variations studied by GRACE can be used to determine ground water storage on land masses. By comparing current data to an average over time, scientists can generate an anomaly map to see where ground water storage has been depleted or increased.
Global Terrestrial Water Storage Anomaly
Research based on GRACE observations indicates that between 2002 and 2016, Greenland shed approximately 280 gigatons of ice per year.
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Greenland Ice Loss 2002-2016
Gravity anomaly map using GRACE data.
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Gravity anomaly map using GRACE data.
Gravity Anomaly Map Using GRACE Data
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The signal of the December 2004 earthquake in the Indian Ocean in GRACE observations of Earth's gravity field. 
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The signal of the December 2004 earthquake in the Indian Ocean in GRACE observations of Earth's gravity field.
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Between 2002 and 2016, Antarctica shed approximately 125 gigatons of ice per year, causing global sea level to rise by 0.35 millimeters per year.
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Antarctic Ice Loss 2002-2016
An animation showing “sea level fingerprints,” or patterns of rising and falling sea levels across the globe in response to changes in Earth’s gravitational and rotational fields. 
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Monthly changes in ocean bottom pressure data obtained by the GRACE satellites from November 2002 to January 2012. 
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Monthly changes in ocean bottom pressure data obtained by the GRACE satellites from November 2002 to January 2012.
Ocean Bottom Pressure 2002-2012
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This visualization displays monthly GRACE data in the Amazon basin. GRACE (Gravity Recovery and Climate Experiment) measures mass distribution and in this instance is used to demonstrate water storage and movement in the basin.
Amazon Basin Monthly GRACE Data
Variations in water storage in the Tigris and Euphrates river basins from 2003 to 2009, measured by GRACE. Reds represent drier conditions, while blues represent wetter conditions. The majority of ...
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Variations in water storage in the Tigris and Euphrates river basins from 2003 to 2009, measured by GRACE. Reds represent drier conditions, while blues represent wetter conditions. The majority of the water lost was due to reductions in groundwater caused by human activities.
Tigris and Euphrates Water Storage, 2003 to 2009
GRACE observed Earth’s surface mass changes nearly every month from 2002 to mid-2017. GRACE Follow-On will provide crucial continuity to these observations for the next five years or more.
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Image of the spacecraft in orbit over Earth, with the black of space.
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The GRACE mission launched in 2002, changing our understanding of Earth.
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The rainy and dry seasons in the Amazon Basin in 2004, revealed by gravity anomalies observed by GRACE. Reds and pinks show where and when mass was higher than average, a sign that more water was p...
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The rainy and dry seasons in the Amazon Basin in 2004, revealed by gravity anomalies observed by GRACE. Reds and pinks show where and when mass was higher than average, a sign that more water was present, and blues show months when mass was lower.
Rainy and Dry Seasons in the Amazon (2004)

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