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The impact of landuse on stream salinity is currently difficult to separatefrom the effect of climate, as the decadal scale climatic cycles ingroundwater and stream hydrology have similar wavelengths to the landusepattern. These hydrological cycles determine the stream salinity throughaccumulation or release of salt in the landscape. Widespread patternsapparent in stream salinity are discussed, and a link is demonstratedbetween stream salinity, groundwater levels and global climatic indicators.The Interdecadal Pacific Oscillation (IPO) has previously been investigatedas a contributory climatic indicator for hydrological and related timeseries in the Southern Hemisphere. This study presents an approach whichexplores the rate of change in the IPO, in addition to its value, to definean indicator for the climate component of ambient shallow groundwater levelsand corresponding stream salinity. Composite time series of groundwaterlevel and stream salinity are compiled using an extensive but irregulardatabase covering a wide geographical area. These are modelled with respectto the IPO and its rate of change to derive control time series. A exampleis given of how a stream salinity trend changes when the decadal climaticinfluence is removed

Defining the climatic signal in stream salinity trends using the Interdecadal Pacific Oscillation and its rate of change