What is GRACE?

In my new novel, Threshold, Dr. Carla Conner is a climate scientist who is part of the GRACE team.

GRACE consists of two identical spacecraft that fly about 220 kilometers (137 miles) apart in a polar orbit 500 kilometers (310 miles) above Earth. GRACE maps Earth’s gravity field by making accurate measurements of the distance between the two satellites, using GPS and a microwave ranging system. It is providing scientists from all over the world with an efficient and cost-effective way to map Earth’s gravity field with unprecedented accuracy. The results from this mission are yielding crucial information about the distribution and flow of mass within Earth and its surroundings.

The gravity variations studied by GRACE include: changes due to surface and deep currents in the ocean; runoff and ground water storage on land masses; exchanges between ice sheets or glaciers and the ocean; and variations of mass within Earth.

Dr. Connor is also a member of the Colorado River Research Group.

In these two capacities she is aware of the shrinking reservoirs for Colorado River water which supplies 40% of Tucson’s water supply. She is very concerned that the “powers that be” react sufficiently to avoid a water crisis.

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