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Research Article Open access CC BY 4.0

Annual Mean Temperature and Rain Precipitation in North America Using NHPP to Detect Climate Changes

Jorge Alberto Achcar, Eliane R. Rodrigues, Ricardo Puziol de Oliveira, Emerson Barili

International Journal of Environment and Climate Change · pp. 141–161 · Published 22 May 2023

10.9734/ijecc/2023/v13i81940

Abstract

In this study, non-homogeneous Poisson processes (NHPP) are assumed to analyze annual average temperatures and rain precipitations, considering climate data for some regions of North America reported for a long period. A power law process (PLP) is assumed for the intensity function (derivative of the mean value function) or rate \(\lambda\) (t), t \(\ge\) 0 of the NHPP which the Poisson events occur considering data (accumulated number of years in a given time interval [0,t) where the climate measure is above a threshould given by the overal average in the assumed period) in presence or not of a change-point. The parameters of the assumed model are estimated under a Bayesian approach and using MCMC (Markov Chain Monte Carlo) methods. Alternatively to the use of a PLP process, we also assume a polynomial parametrical form for the mean value function of the NHPP process where a simple Bayesian inference approach is proposed to get better fit for the intensity and mean value functions of the NHPP process. From the fitted models it was possible to to detect the years where climate changes occurred.

Climate change non-homogeneous poisson processes PLP process polynomial mean value function bayesian inference change-point MCMC methods

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