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Depth profiles of chemical impurities found in snow and ice have usually been interpreted simply in terms of temporal changes in atmospheric concentrations of the species of interest. Measurements of pH and conductivity from individual snow stratigraphic layers sampled above 2,600 metres indicate local spatial variation sufficiently large to potentially mask temporal changes inferred from depth profiles. A method is presented for calculating the number of samples of a given stratigraphic layer necessary to achieve the required precision about the mean pH in a vertical ice profile

Difficulties in Deducing Temporal Changes in Precipitation Chemistry from Snow and Ice Cores: The Spatial Variability Problem