โ Scribed by Thompson, C. S.
No coin nor oath required. For personal study only.
One approach in the stochastic modelling of rainfall is to derive a distribution function which has physically meaningful parameters. Such a distribution is derived from a Poisson process of rainfall occurrence with an independent exponentially distributed rainfall amount. The distribution appears to fit monthly precipitation totals extremely well.
This type of model has many potential applications in climatology and hydrology. The homogenizing of long term rainfall sequences is one of these, and a methodology for this process is presented here. A 130 year record, from Auckland, New Zealand with three changes of site, is used to evaluate the procedure described.
The significant advantage in the proposed method is that the homogeneity testing is done within the single rainfall record and the use of comparison stations is not required. KEY WORDS Inhomogeneous rainfall records Model of monthly rainfall with meaningful parametric representation Reference areal values of parameters Site changes Methodology to evaluate rainfall homogeneity
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We are grateful to Dr Jones for his commentary (Jones, 1985) and the opportunity to reply. Dr Jones has drawn attention to apparent flaws in the methodology presented by Thompson (1984). However in the context for which the methodology was advocated he may not have carried out similar tests on the '
## Abstract In this study, regional climates of Iran were identified based on the properties of the monthly rainfall time series models of 28 main cities of Iran. The autocorrelation (ACF) and partial autocorrelation (PACF) of selected series revealed the seasonal behavior of the monthly rainfall.
## Abstract The effect of global warming (represented by general circulation model monthly rainfall predictions) on the daily rainfall distribution is investigated using a mixed Gamma distribution to estimate the change of rainfall quantiles. A mixed distribution is used to overcome the limitation
Statistical models have been used to provide operational seasonal forecasts of rainfall over southern Africa since 1992. The Climatology Research Group has been using a quadratic discriminant analysis model since November 1994. The model relates rainfall over different areas of South Africa to princ
This paper provides a procedure for evaluating model performance where model predictions and observations are given as time series data. The procedure focuses on the analysis of error time series by graphing them, summarizing them, and predicting their variability through available information (reca