Hidden Freshwater Found Under Great Salt Lake Shocks Scientists!

A study published in the journal Scientific Reports reveals a surprising finding: a huge freshwater deposit lies beneath the salty surface of the Great Salt Lake. This discovery contradicts the previous belief that any freshwater presence would be small and limited to the outskirts of the lake, originating from nearby mountains.

The finding suggests that possibly the entire saltwater lake is supported by freshwater. Lead author Michael Zhdanov, a geophysicist at the University of Utah, stated that they were able to determine the depth and spatial extent of this potential reservoir under the eastern margin of the lake. The research used airborne electromagnetic surveys to analyze the electrical conductivity of the subsurface.

Scientists suspected the presence of freshwater due to the sudden appearance of mounds of reeds in dry areas of the lakebed. To investigate, airborne electromagnetic surveys were conducted, using helicopters and equipment that measured the electrical conductivity of the ground. This method allowed for distinguishing between salt and fresh water, as salinity affects the conductivity of the liquid, and also analyzing the composition of rocks and soils.

After 154 miles of flying, the team collected data that revealed spikes of freshwater throughout the lake, indicating a larger reservoir than expected. A sudden drop was observed in the lake's subterranean layer, from a few hundred yards to over 2.5 miles deep.

Bill Johnson, a UT hydrologist and co-author of the study, called the findings “unexpected.” In an interview on KPCW's Cool Science Radio show, he explained that they would normally expect the brine to occupy the entire volume under the lake, as it is denser than freshwater. However, they found that the freshwater is coming in towards the interior of the lake, forming a deep volume under the saline lens.

The aerial survey only covered a fraction of the total area of the lake, so further studies are needed to determine the full size of the reservoir. The discovery has generated great interest in the scientific community, with Zhdanov emphasizing the need for more research throughout the Great Salt Lake.

Traditionally, freshwater, coming from the mountains, was expected to remain on the periphery of the lake. However, the findings suggest a different dynamic, with freshwater infiltrating towards the interior and forming a significant subterranean reservoir. This discovery could have important implications for understanding the region's hydrology and managing water resources.

The research highlights the importance of continuing to explore and map the subsurface of the Great Salt Lake to gain a complete picture of its geological and hydrological characteristics.

The current research provided a preliminary view, but to fully understand the extent of the freshwater reservoir, additional studies are crucial. These studies will help determine the amount of freshwater available and its impact on the lake's ecosystem.

The research team plans to continue their efforts to map the entirety of the Great Salt Lake, with the goal of gaining a more complete understanding of this fascinating geological phenomenon.