Analysis of climatic data for the chateau, Mt Ruaphehu (1930-1988), in relation to climatic change
Greenhouse-effect-induced climate change in New Zealand will likely manifest itself by changes in general circulation intensity, which will result in changes in frequencies of weather patterns, and thus ultimately in climatic parameters. In this study certain climatic parameters at the Chateau, on the northern footslopes of Mt Ruapehu, were analysed for changes during the period of record (1930 - 1988). Climatic change could be deduced, especially in temperature parameters. The monthly mean temperature increased 0.9°C during the period of record. Changes in summer and winter temperatures have been more consistent than those in autumn and spring. Monthly-precipitation totals appear not to have changed significantly over the period of record, but the overall seasonal-distribution of total precipitation indicates a decrease during summer and an increase in winter and spring. The monthly average number of days with snow has evidently decreased over the period of record (16.8 days). Directional frequencies of winds seem to be changing, with decreases from N, NW and W directions but increases from the SW. Principal-component analysis of twelve variables was undertaken and the major interpretations were that the number of snow days was inversely associated with low temperatures, as would be expected; and that high yearly-precipitation totals were associated with low temperature ranges.