viernes, 20 de enero de 2017

Caves in central China show history of natural flood patterns


Scanned image of a polished stalagmite showing growth layers... Credit: Becky Strauss (Minnesota Ph.D. 2016)

Researchers use cave structures to identify historical precipitation

Researchers at the University of Minnesota have found that major flooding and large amounts of precipitation occur on 500-year cycles in central China. These findings shed light on the forecasting of future floods and improve understanding of climate change over time and the potential mechanism of strong precipitation in monsoon regions.

The research is published in the published in the Proceedings of the U.S. National Academy of Sciences (PNAS).

"To predict how climate change will impact the future, it's important to know what has happened in the past," said Joshua Feinberg, a University of Minnesota associate professor of Earth Sciences and associate director of the Institute for Rock Magnetism, who supervised the research.

"As the variability and intensity of storms increase in the world, we need to reevaluate what the frequency of these major storms could be," Feinberg said. "We didn't have the potential to develop these kinds of precipitation records for most of the world, until now. These speleothems provide more than 8,000 years of data that led us to identify with strong confidence the presence of a 500-year cycle," he added [...] ScienceDaily