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Using new calculations of 10Be production in the Earths atmosphere which arebased on direct measurements of the 11-year solar modulation effects ongalactic cosmic rays and spacecraft measurements of the cosmic ray energyspectrum, we have calculated the yearly average production of 10Be in theEarths atmosphere by galactic and solar cosmic rays since 1939. During the lastsix 11-year cycles the average amplitude of these production changes is 36%.These predictions are compared with measurements of 10Be concentration in polarice cores in both the Northern and Southern hemisphere over the same timeperiod. We find a large scatter between the predicted and measured yearlyaverage data sets and a low cross correlation ~0.30. Also the normalizedregression line slope between 10Be production changes and 10Be concentrationchanges is found to be only 0.4-0.6; much less than the value of 1.0 expectedfor a simple proportionality between these quantities, as is typically used forhistorical projections of the relationship between 10Be concentration and solaractivity. The distribution of yearly averages in the 10Be concentration levelin the data from the Dye-3 ice core in Greenland for the time period 1939-1985,contains a "spike" of high concentration one year averages which is not seen inthe production calculations. These and other features suggest that galacticcosmic ray intensity changes which affect the production of 10Be in the Earthsatmosphere are not the sole source of the 10Be concentration changes andconfirm the importance of other effects, for example local and regionalclimatic effects, which could be of the same magnitude as the 10Be productionchanges.

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