A research project put together in part by San Diego researchers achieved something never before done. KPBSErik says the research team recovered lake-bed sediment samples buried under a 15-meter-deep lake located under 3,500 feet of Antarctica ice.
“When we accessed Mercer subglacial lake, the water column was about 15 meters thick, so that’s a pretty deep lake,” said Ryan Venturelli, a researcher at the Colorado School of Mines.
Those samples had layers of sediment. Much like tree rings, the sediment layers reveal what has been happening in this hidden body of water. When it fills and when it drains.“In this subglacial environment we have never seen something like this before,” Venturelli said. “But we have thought, since we initially observed these lakes underneath the ice sheet, that they should reflect something of the overlying ice.”which was produced in 2022.
“It’s a pancake,” Siegfried said. “ It’ll deposit one type of sediment. Then another layer goes on top of that that’ll be a different kind of sediment. And on and on we go. And that’s how we draw paleo climate conclusions every day in ocean cores for example.”
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