Borsa and his team studied the salar de Uyuni in southwestern Bolivia, which is both a popular tourist destination and a potential calibration site for Earth-orbiting scientific instruments. It had never before been surveyed on this scale using modern techniques.
Although the salar appears to be perfectly flat to the eye, by applying an innovative method of error correction to their data, the team was able to identify broad features ranging in height from a few centimeters to half a meter and extending over distances of tens of kilometers or more.
Earlier maps do not show any surface relief on the salar de Uyuni. By mapping the surface to the accuracy of a few centimeters, the research team uncovered previously hidden features -- hills, ridges and valleys -- and opened the salar for use as a ground reference site for highly accurate satellite-based ranging instruments. “We had no idea these features existed,” said Dr. Borsa, “but they matter to anyone who uses the salt flat to calibrate satellite altimeters.”
The scientists' most unexpected finding was that the broadest topographic features on the salar correlate well with the increase in the strength of gravity at the surface that results from dense rock buried underneath salar sediments. Just as the ocean surface rises over denser seamounts, the salar surface also rises and falls to reflect the subsurface density variations. This effect has never before been observed on land.
Samantha Holford | alfa
NASA sees the end of ex-Tropical Cyclone 02W
21.04.2017 | NASA/Goddard Space Flight Center
New research unlocks forests' potential in climate change mitigation
21.04.2017 | Clemson University
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment...
Glaciers might seem rather inhospitable environments. However, they are home to a diverse and vibrant microbial community. It’s becoming increasingly clear that they play a bigger role in the carbon cycle than previously thought.
A new study, now published in the journal Nature Geoscience, shows how microbial communities in melting glaciers contribute to the Earth’s carbon cycle, a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
21.04.2017 | Physics and Astronomy
21.04.2017 | Health and Medicine
21.04.2017 | Physics and Astronomy