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A Comparison of New Calculations of 10Be Production in the Earths Polar Atmosphere by Cosmic Rays with 10Be Concentration Measurements in Polar Ice Cores Between 1939-2005 - a Troubling Lack of Concordance Paper #1 by Webber, W. R.; Higbie, P. R. is a scholarly article available to read on EtoBox.

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Using new calculations of 10Be production in the Earths atmosphere which are based on direct measurements of the 11-year solar modulation effects on galactic cosmic rays and spacecraft measurements of the cosmic ray energy spectrum, we have calculated the yearly average production of 10Be in the Earths atmosphere by galactic and solar cosmic rays since 1939. During the last six 11-year cycles the average amplitude of these production changes is 36%. These predictions are compared with measurements of 10Be concentration in polar ice cores in both the Northern and Southern hemisphere over the same time period. We find a large scatter between the predicted and measured yearly average data sets and a low cross correlation ~0.30. Also the normalized regression line slope between 10Be production changes and 10Be concentration changes is found to be only 0.4-0.6; much less than the value of 1.0 expected for a simple proportionality between these quantities, as is typically used for historical projections of the relationship between 10Be concentration and solar activity. The distribution of yearly averages in the 10Be concentration level in the data from the Dye-3 ice core in Greenland for

Author

Webber, W. R.; Higbie, P. R.

Published

2010

Language

EN