An approach to the dynamic climatology of New Zealand.
Degree GrantorUniversity of Canterbury
Degree NameDoctor of Philosophy
The explanatory description of the climate of the New Zealand region is approached from a statistical time scale analysis of meteorological data for the year August 1962 to August 1963. The equations for the calculation of the variance spectra for individual series and of the interrelationships spectra for two series are given and their application to meteorological data discussed. Calculations of the variances reveal that the spectra of meteorological elements are continuous but that some frequencies appear to stand out more than others. The periods of one day and one year are dominant, especially in temperature, but also frequencies of about 0.0250, 0.0625, 01500 and 0.2000 cycles per day appear consistently above the others on a linear frequency scale. The frequencies of 0.0750 and 0.1375 cycles per day have been selected for detailed study of the interrelationships. They show that there is moderate coherence between data at these scales, and that models constructed from the calculations show a high similarity to those of the spatial domain. Together with the mean values their role in the maintenance of the general circulation is outlined. A direct and objective relationship between the general circulation and the large scale features of climate is thus evolved.