What is the GRACE satellite Pair doing?

What is the GRACE satellite Pair doing?

GRACE – Gravity Recovery and Climate Experiment. GRACE, twin satellites launched in March 2002, are making detailed measurements of Earth’s gravity field which will lead to discoveries about gravity and Earth’s natural systems. These discoveries could have far-reaching benefits to society and the world’s population.

How does GRACE measure groundwater?

NASA’s GRACE mission provides the first opportunity to directly measure groundwater changes from space. By observing changes in the Earth’s gravity field, scientists can estimate changes in the amount of water stored in a region, which cause changes in gravity.

What does the GRACE satellite measure?

GRACE, short for Gravity Recovery and Climate Experiment, is a NASA mission consisting of twin satellites that were launched in 2002. Together, they measure Earth’s gravity field with a precision greater than any previous instrument.

What is GRACE data?

Mission Objectives Launched 17 March 2002, Gravity Recovery and Climate Experiment (GRACE) twin satelliteshe Gravity Recovery and Climate Experiment (GRACE) twin satellites made detailed measurements of Earth’s gravity field and improved investigations about Earth’s water reservoirs, over land, ice and oceans.

How does Grace fo work?

GRACE-FO raw data is a series of measurements showing how far apart two satellites are. The twin GRACE-FO satellites follow each other in orbit around the Earth, separated by about 137 miles (220 km). They constantly send microwave signals to each other to measure the distance between them.

What is water equivalent thickness GRACE?

What is ‘Equivalent Water Thickness’? The mass changes can be thought of as concentrated in a very thin layer of water thickness changes near the Earth’s surface (i.e., in a layer up to several kilometers thick).

What is water equivalent height as measured by GRACE?

When spread over an area of 500 km × 500 km, a typical scale of analysis for GRACE studies, this volume equates to roughly 160 mm of equivalent water height, which is much larger than the estimated uncertainty of the monthly GRACE solutions at that resolution (17–38 mm depending upon whether or not correlated errors …

Where is the highest gravity on Earth?

Mount Nevado Huascarán in Peru has the lowest gravitational acceleration, at 9.7639 m/s2, while the highest is at the surface of the Arctic Ocean, at 9.8337 m/s2.

What is something scientists can do with long time series GRACE data?

From distance measurements between the two satellites, GRACE data can be used to estimate Earth’s gravity field, the force that anchors us to the planet. Gravity is the attraction between two objects. Its strength varies depending on how much mass those objects have and how far apart they are.

What is the twin satellites GRACE able to measure?

Using the microwave ranging system, GRACE can measure the distance between satellites to within one micron — about the diameter of a blood cell. Together, these very precise measurements of location, force and orbital change translate into an observation of gravity with unprecedented accuracy.

Do satellites follow each other?

Trailing formations are formed by multiple satellites orbiting on the same path. Each one follows the previous one separated by a specific time interval to either view a target at different times, or obtain varied viewing angles of the target.

Where can I download the grace Earth data?

Download GRACE data through the anonymous FTP made available by GeoForschungsZentrum Potsdam (GFZ), The data is freely available without registration. On the basis of an agreement with the GeoForschungsZentrum Potsdam (GFZ), external access to following collections is available.

What was the purpose of the GRACE satellite?

GRACE (Gravity Recovery and Climate Experiment) was a gravity study mission, a joint project between NASA and DLR of Germany, and was part of the international Earth Observing System of satellites.The mission cosisted of two idendical satellites GRACE – A and GRACE – B and they were launched together.

How can I get data from GRACE Tellus?

This data browser allows the interactive retrieval of GRACE & GRACE-FO Land data over river basins, as well as the evaluation of long-term trends and mean seasonal amplitudes. Land water storage from GRACE is updated monthly, and is provided on 1-degree global grids.

When was the GRACE mission launched and when did it end?

It was launched on 17 March 2002 and finished on 27 October 2017 when the spacecraft ran out of fuel. GRACE is part of ESA’s Third Party Missions Programme, in which ESA has an agreement with NASA to distribute data products from the mission.