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Calibrating a long-term meteoric <sup>10</sup>Be accumulation rate in soil
Reusser, Lucas Graly, Joseph Bierman, Paul Rood, Dylan
Reusser, Lucas
Graly, Joseph
Bierman, Paul
Rood, Dylan
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© 2009. American Geophysical Union. All Rights Reserved.
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Abstract
Using 13 samples collected from a 4.1 meter profile in a well-dated and stable New Zealand fluvial terrace, we present the first long-term accumulation rate for meteoric 10Be in soil (1.68 to 1.72 × 106 at/(cm2yr)) integrated over the past ∼18 ka. Site-specific accumulation data, such as these, are prerequisite to the application of meteoric 10Be in surface process studies. Our data begin the process of calibrating long-term meteoric 10Be delivery rates across latitude and precipitation gradients. Our integrated rate is lower than contemporary meteoric 10Be fluxes measured in New Zealand rainfall, suggesting that long-term average precipitation, dust flux, or both, at this site were less than modern values. With accurately calibrated long-term delivery rates, such as this, meteoric 10Be will be a powerful tool for studying rates of landscape change in environments where other cosmogenic nuclides, such as in situ 10Be, cannot be used. Copyright 2010 by the American Geophysical Union.
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2010-10-01
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Reusser, L., Graly, J., Bierman, P., and Rood, D. (2010), Calibrating a long‐term meteoric 10Be accumulation rate in soil, Geophys. Res. Lett., 37, L19403, doi:10.1029/2010GL044751.