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When Mark Abbott and his team pulled a 300-foot-long mud core from the bottom of a high lake in the Peruvian Andes, he hoped it could provide a glimpse into the last 160,000 years of climate change. Instead, the researchers revealed July 13 in the journal Nature, that the lake floor recorded glacier tides for more than 700,000 years – the longest glacier record for the tropics, and among the longest historical climate records, full point. In the lake’s mud, a multi-agency team found clues about how climate change could shape the modern world. “This is unlike anything we’ve had before,” said Abbott, a professor of geology and environmental sciences at the Kenneth P. Dietrich School of Arts and Sciences at the University of Pittsburgh. “We now have a land-based record of glaciation from the tropics that is in many ways the same as our record from polar ice caps and from the oceans, and it’s really lacking.” Researchers have known for decades that Lake Junin is a rare gem. Located more

Glaciers in tropical mountains are experiencing the same impact of climate change drivers as those in the polar regions of Antarctica and the Northern Hemisphere, according to a study published today in Nature. The paper by an international team of scientists, including Robert Hatfield, assistant professor in the University of Florida’s Department of Geological Sciences, is the first to show that the effects of greenhouse gases and other drivers of Earth’s temperature are impacting glaciers in the South. Hemisphere at the same speed as the northern ice sheet. To derive their findings, the researchers used sediment deposits from Lake Junín, high in the Peruvian Andes, to create a record of glacial changes that stretch back 700,000 years. Hatfield explains that much of what scientists know about past glacial changes comes from records of ice growth and decay occurring in the Northern Hemisphere. “As we try to understand how climate works around the world, we need more than a record of