Skip Navigation
Navigation Close Modal

Related

One of the GRACE satellites undergoes thermal testing at IABG in Germany.
More
Light shines on a GRACE satellite seen in a thermal chamber at IABG.
Thermal Testing for GRACE Satellite
The original GRACE satellites in a clean room in Germany.
More
Two GRACE satellites are next to each other in a clean room.
GRACE Satellites Under Construction
This animation shows the annual water storage changes over the U.S. from GRACE from 2003 - 2013.
More
Annual water storage changes over the U.S. From GRACE
Annual water storage changes over the U.S. From GRACE
This animation illustrates the movements of the two GRACE-FO satellites as they orbit Earth.
More
This animation illustrates the movements of the two GRACE-FO satellites as they orbit Earth. As the satellites pass over topographic or mass anomaly features, the relative distance between the satellites changes. This distance change is precisely tracked with the two ranging interferometers: the Microwave Instrument (MWI), as well as the technology-demonstration Laser Ranging Instrument (LRI). Every 30 days, the polar-orbiting satellites gather enough data to derive a global map of the surface mass distribution. The differences in this mass distribution from one month to the next provide fundamental indicators of the large-scale dynamics of the planet as mass (mostly in the form of water) is constantly redistributed within and between Earth’s atmosphere, oceans, groundwater and ice sheets. Since 2018, GRACE Follow-On (GRACE-FO) continues the legacy of GRACE (2002-2017), tracking Earth’s water movement and surface mass changes across the planet. Monitoring changes in ice sheets and glaciers, near-surface and underground water storage, the amount of water in large lakes and rivers, as well as changes in sea level and ocean currents provides an integrated global view of how Earth’s water cycle and energy balance are evolving—measurements that have important applications for everyday life.
GRACE-FO: from range observations to global mass change
The force of gravity not only keeps us from floating away, it also lets NASA study Earth’s water and ice from space. Using a pair of twin satellites named "GRACE," we can monitor our planet’s water.
More
The force of gravity not only keeps us from floating away, it also lets NASA study Earth’s water and ice from space. Using a pair of twin satellites named "GRACE," we can monitor where our planet’s water is going, even when it is underground.
Scale in the Sky
GPS signal occultation by the atmosphere, and the resulting useful data is explained.
More
GPS signal occultation explanation.
Occult.mov
GRACE satellites are mounted belly to belly at an IABG testing facility in Germany.
More
GRACE satellites are mounted belly to belly at an IABG testing facility in Germany.
GRACE Satellites at IABG
One of the twin GRACE satellites, Flight Model 1, is seen on a trolley during construction in Germany.
More
Empty shell of GRACE satellite during construction.
GRACE Satellite Under Construction
These images show the changes in gravity anomalies from GRACE over the Amazon Basin for each month of 2004. 
More
Amazon Basin seasonal hydrology
Amazon Basin seasonal hydrology
GRACE on orbit
More
GRACE on orbit
GRACE on orbit
GRACE mission pre-launch poster
More
GRACE mission pre-launch poster
GRACE mission pre-launch poster
Between 2002 and 2020, Antarctica shed approximately 150 gigatons of ice per year, causing global sea level to rise by 0.4 millimeters per year.
More
Between 2002 and 2020, Antarctica shed approximately 150 gigatons of ice per year, causing global sea level to rise by 0.4 millimeters per year.
Antarctic Ice Loss 2002-2020
This visualization of a gravity model was created with data from NASA's Gravity Recovery and Climate Experiment (GRACE) and shows variations in Earth’s gravity field.
More
GRACE global gravity animation
GRACE global gravity animation
The GRACE satellites are seen at an IABG testing facility in Germany.
More
Two GRACE satellites are seen belly to belly in a testing clean room.
GRACE Satellite Testing
The GRACE satellites during component integration in a German clean room.
More
The GRACE satellites are shown without solar panels during component integration in a German clean room.
GRACE Component Integration
NASA’s Gravity Recovery and Climate Experiment (GRACE) has measured significant groundwater depletion around the world in recent years. These animations show trends in total water storage from Jan....
More
GRACE Sees Groundwater Losses Around the World
GRACE Sees Groundwater Losses Around the World
One of the twin GRACE spacecraft is seen during construction in Germany.
More
One of the twin GRACE spacecraft is seen during construction in Germany.
GRACE Satellite Build
The twin GRACE satellites are seen in a clean room in Germany in 2002.
More
Two satellites are seen next to each other.
GRACE Satellites in Clean Room
GRACE being readied for launch - 1
More
GRACE being readied for launch - 1
GRACE being readied for launch - 1
GRACE on orbit - 1
More
GRACE on orbit - 1
GRACE on orbit - 1
Global ocean conveyor belt of warm and cold water is explained.
More
Global ocean conveyor belt explanation.
Conveyor.mov
This visualization shows extremes of the water cycle — droughts and pluvials — over a twenty-year period (2002-2021) based on observations from the GRACE and GRACE-FO satellites. Dry events are sho...
More
This visualization shows extremes of the water cycle — droughts and pluvials — over a twenty-year period (2002-2021) based on observations from the GRACE and GRACE-FO satellites. Dry events are shown as red spheres and wet events as blue spheres, with earlier years being shown as lighter shades and later years as darker shades. The volume of the sphere is proportional to the intensity of the event, a quantity measured in cubic kilometer months. A total of 1,056 extreme wet and dry events appear over the course of the visualization. The plots at the bottom of the figure show that the total intensity of extreme events increased as global temperatures increased. The most intense event was a 2019 pluvial (excessive, persistent rain) in central Africa. In a study of 20 years of data from the NASA/German GRACE and GRACE-FO satellites, two NASA scientists confirmed that major droughts and pluvials — periods of excessive precipitation and water storage on the landscape — have been occurring more often. They also found that the worldwide intensity of these extreme wet and dry events – a metric that combines extent, duration, and severity — is closely linked to global warming. Floods and droughts account for more than 20% of the economic losses caused by extreme weather events in the U.S. each year, ranked second after hurricanes among major disasters. The economic impacts are similar around the world, though the human toll tends to be most devastating in poor and developing nations. From 2015-2021 — seven of the warmest years in the modern record — the frequency of extreme wet and dry events was four per year, compared with three per year in the previous 13 years. This makes sense, say the authors, because warmer air causes more moisture to evaporate from Earth's surface during dry events; warm air can also hold more moisture to fuel severe snow- and rainfall events.
Water Cycle Extremes: Droughts and Pluvials
NASA’s Gravity Recovery and Climate Experiment (GRACE, 2002 - 2017) mission, and its successor GRACE Follow-On (launched in 2018), map month-to-month changes in Earth's gravity field resulting from...
More
NASA’s Gravity Recovery and Climate Experiment (GRACE, 2002 - 2017) mission, and its successor GRACE Follow-On (launched in 2018), map month-to-month changes in Earth's gravity field resulting from the movement of mass, such as water, near the surface of the planet. This animation shows how the total amount of water (snow, surface water, soil moisture, and groundwater) varies in space and time, with the passage of dry seasons and wet seasons as well as with flooding, drought, and transport due to water management. Blue colors represent wetter than average conditions (relative to 2004-2010), while red colors represent drier than average conditions. The yellow line in the graph on the left shows the evolution of the long-term inter-annual variations for the area outlined in yellow on the map (note: the average seasonal cycle has been removed). The Sacramento and San Joaquin River basins are outlined in yellow, and rivers and tributaries are shown as blue lines. The basins include California's Central Valley, the most productive agricultural region in the U.S. Repeated drought conditions and increased water use in California have led to a long-term decline of terrestrial water, interspersed with above-average precipitation periods (e.g., 2015/2016; 2022/2023) that have allowed some recovery of the land water storage.
GRACE and GRACE-FO track California's land water changes
GRACE logo
More
GRACE logo
GRACE logo
Research based on GRACE observations indicates that between 2002 and 2021, Greenland shed approximately 280 gigatons of ice per year.
More
Research based on GRACE & GRACE-FO observations indicates that between 2002 and 2021, Greenland shed approximately 280 gigatons of ice per year.
Greenland Ice Loss 2002-2021

You Might Also Like

Click for more
More
NASA Satellites Reveal Abrupt Drop in Global Freshwater Levels
NASA Satellites Reveal Abrupt Drop in Global Freshwater Levels
Click for more
More
Data in Action: GRACE and GRACE-FO are used by California's Department of Water Resources for Groundwater Management Information
Data in Action: GRACE and GRACE-FO are used by California's Department of Water Resources for Groundwater Management Information
Click for more
More
US, Germany Partnering on Mission to Track Earth's Water Movement
US, Germany Partnering on Mission to Track Earth's Water Movement
Click for more
More
Google's ‘A Passage of Water' Brings NASA's Water Data to Life
Google's ‘A Passage of Water' Brings NASA's Water Data to Life
Click for more
More
US-German Satellites Show California Water Gains After Record Winter
US-German Satellites Show California Water Gains After Record Winter
Click for more
More
Warming Makes Droughts, Extreme Wet Events More Frequent, Intense
Warming Makes Droughts, Extreme Wet Events More Frequent, Intense