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Full-Text Articles in Physical Sciences and Mathematics
Cosmogenic 26Al/10Be Surface Production Ratio In Greenland, Lee B. Corbett, Paul R. Bierman, Dylan H. Rood, Marc W. Caffee, Nathaniel A. Lifton, Thomas E. Woodruff
Cosmogenic 26Al/10Be Surface Production Ratio In Greenland, Lee B. Corbett, Paul R. Bierman, Dylan H. Rood, Marc W. Caffee, Nathaniel A. Lifton, Thomas E. Woodruff
College of Arts and Sciences Faculty Publications
The assumed value for the cosmogenic 26Al/10Be surface production rate ratio in quartz is an important parameter for studies investigating the burial or subaerial erosion of long-lived surfaces and sediments. Recent models and data suggest that the production ratio is spatially variable and may be greater than originally thought. Here we present measured 26Al/10Be ratios for 24 continuously exposed bedrock and boulder surfaces spanning ~61–77°N in Greenland. Empirical measurements, such as ours, include nuclides produced predominately by neutron-induced spallation with percent-level contributions by muon interactions. The slope of a York regression line fit to our data is 7.3 ± 0.3 …
Preservation And Sediment Cycling Beneath "Ghost Glaciers": How Cold-Based Ice Dictates Arctic Landscape Evolution, Lee Corbett
Preservation And Sediment Cycling Beneath "Ghost Glaciers": How Cold-Based Ice Dictates Arctic Landscape Evolution, Lee Corbett
Graduate College Dissertations and Theses
Constraining past episodes of climate change and glacial response is critical for understanding future impacts of climate change, especially in the high latitudes where warming is expected to be rapid and most of Earth's glaciers exist. Many studies of past glacier size utilize rare isotopes called cosmogenic nuclides to perform surface exposure dating. Since most areas of Earth's surface that were previously glaciated were covered by erosive ice, which stripped away pre-existing cosmogenic nuclides, surface exposure dating yields the timing of the most recent deglaciation. However, in some high latitude areas where glacial ice is cold-based and non-erosive (so-called 'ghost …