EXPLORING TIME-DEPENDENT GEOMAGNETIC AND ATMOSPHERIC EFFECTS ON COSMOGENIC NUCLIDE PRODUCTION-RATE SCALING
Scaling predictions are tested empirically using recently published production rate calibration data for both 10Be and 3He. Results for the few calibration sites from geomagnetically sensitive regions suggest that the Pavón-Carrasco et al. (2014) model with an RCAparameterization tends to predict sea level, high latitude production rates more in line with those from calibration sites not affected by geomagnetic variations, suggesting a global resolution of regional production rate differences is possible with additional high-quality calibrations and improved geomagnetic models.
In addition, the effects of a time-dependent atmospheric model (SynTraCE-21, e.g., Liu et al., 2009, Science 325, 310–314) on LSD scaling predictions are evaluated from 0-21 ka. Given the dominance of altitudinal over latitudinal (geomagnetic) scaling effects on CN production, incorporating such transient global simulations of atmospheric structure into scaling frameworks may contribute to improved understanding of long-term production rate variations and their implications for surficial process studies.