FIGURE 1. 10Be flux versus delta18O in ice at Summit. delta18O denotes the relative deviation in per mil of the 18O/16O ratio from the 18O/16O value of SMOW (standard mean ocean water).

From the following article:

Changes in deep-water formation during the Younger Dryas event inferred from 10Be and 14C records

Raimund Muscheler, Jürg Beer, Gerhard Wagner and Robert C. Finkel

Nature 408, 567-570(30 November 2000)



Included in the figure are the 10Be data from 15,000 to 9,300 yr bp. To calculate the 10Be flux, the accumulation rate was averaged to match the temporal resolution of the 10Be data. There are two similar approaches to reconstructing the accumulation rate. One is based on identifying the annual layers and correcting for the thinning of the layers using ice-flow models23. The other method makes use of the relationship between accumulation rate and delta18O measured in the ice core27. We use the second method to calculate the 10Be flux. The 10Be flux at Summit is independent of delta18O, a climate proxy that shows large changes during the last deglaciation28. This independence indicates that climate-related changes in the transport of 10Be to Summit or in the deposition of 10Be are lacking. Even during the rapid increase in delta18O occurring at the Younger Dryas/Holocene transition, the 10Be flux exhibits hardly any change, again indicating only a very small climate effect, if any.