Rainfall controls cascade mountains’ erosion and bedrock uplift patters
The pattern of rainfall in the Washington Cascades strongly affects long-term erosion rates in the mountain range and may cause bedrock to be pulled up towards the Earths surface faster in some places than others, according to a National Science Foundation (NSF)-funded study published in this weeks issue of the journal Nature. The results are the first convincing evidence of such effects, on mountain-range scales.
“The data strongly suggest that precipitation controls erosion rates across the Cascades, and that the regional climate may also exert a strong control on the distribution and scale of tectonic rock uplift and deformation of the range,” said Peter Reiners, lead author of the study and a geologist at Yale University.
“Geologists usually think of erosion wearing away mountains,” says David Fountain, program director in NSFs division of earth sciences, which funded the research. “These results, however, show us that erosion can be an important player in uplift of mountain ranges, especially in mountainous regions that receive heavy precipitation.”
Using a dating method that determines when and how fast erosion brings bedrock toward the surface of the Earth, Reiners and his co-researchers found evidence to support long-standing theories about the interplay of climate, erosion and tectonics.
“People have thought the scale and pattern of rock uplift is mostly controlled by deep, plate-tectonic forces,” he said. “Based on our findings, the pattern of bedrock uplift is closely tied to climate through erosion.”
Rainfall is heavy in parts of the Pacific Northwest because mountains in the region cast enormous rain shadows. Moist air moving east from the Pacific rises and cools as it encounters the ranges, dumping large amounts of rain and snow on the west side of the Cascades, where it rains about 10 times more than in most places in Washington. The east sides and the summits are relatively dry.
Co-authors of the paper include Todd Ehlers of the University of Michigan and Sara Mitchell and David Montgomery of the University of Washington.
Media Contacts:
NSF: Cheryl Dybas, 703-292-7734, cdybas@nsf.gov
Yale University: Jacqueline Weaver, 203-432-8555, jacqueline.weaver@yale.edu
NSF Program Contact: David Fountain, dfountai@nsf.gov
The National Science Foundation is an independent federal agency that supports fundamental research and education across all fields of science and engineering, with an annual budget of nearly $5 billion. National Science Foundation funds reach all 50 states through grants to nearly 2,000 universities and institutions. Each year, NSF receives about 30,000 competitive requests for funding, and makes about 10,000 new funding awards. The National Science Foundation also awards over $200 million in professional and service contracts yearly.
Receive official National Science Foundation news electronically through the e-mail delivery system, NSFnews. To subscribe, send an e-mail message to join-nsfnews@lists.nsf.gov In the body of the message, type “subscribe nsfnews” and then type your name. (Ex.: “subscribe nsfnews John Smith”)
Media Contact
All latest news from the category: Earth Sciences
Earth Sciences (also referred to as Geosciences), which deals with basic issues surrounding our planet, plays a vital role in the area of energy and raw materials supply.
Earth Sciences comprises subjects such as geology, geography, geological informatics, paleontology, mineralogy, petrography, crystallography, geophysics, geodesy, glaciology, cartography, photogrammetry, meteorology and seismology, early-warning systems, earthquake research and polar research.
Newest articles
Bringing bio-inspired robots to life
Nebraska researcher Eric Markvicka gets NSF CAREER Award to pursue manufacture of novel materials for soft robotics and stretchable electronics. Engineers are increasingly eager to develop robots that mimic the…
Bella moths use poison to attract mates
Scientists are closer to finding out how. Pyrrolizidine alkaloids are as bitter and toxic as they are hard to pronounce. They’re produced by several different types of plants and are…
AI tool creates ‘synthetic’ images of cells
…for enhanced microscopy analysis. Observing individual cells through microscopes can reveal a range of important cell biological phenomena that frequently play a role in human diseases, but the process of…