Note that the DYE-3 data has been corrected for upstream depletion of d18O. The upstream correction is based on a linear approximation to results from a flow model (Reeh et al., 1985). This approximation yields a correction of 0.0229 per mil per century. Annual data are calculated as averages between subsequent winter minima. Note that winter data are from year of January. The seasonal data have been calculated from forward diffused d18O data.