Abstract
An original approach is proposed to estimate the impacts of climate change on extreme events using an hourly rainfall stochastic generator. The considered generator relies on three parameters. These parameters are estimated by average, not by extreme, values of daily climatic characteristics. Since climate changes should result in parameters instability in time, the paper focuses on testing the presence of linear trends in the generator parameters. Maximum likelihood tests are used under a Poisson–Pareto-Peak-Over-Threshold model. A general regionalization procedure is also proposed which offers the possibility to work on both local and regional scales. From the daily information of 139 rain gauge stations between 1960 and 2003, changes in heavy precipitations in France and their impacts on quantile predictions are investigated. It appears that significant changes occur mainly between December and May for the rainfall occurrence which increased during the four last decades, except in the Mediterranean area. Using the trend estimates, one can deduced that these changes, up to now, do not affect quantile estimations.
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Notes
The threshold 20 mm is a compromise to have enough event (∼5 events per years) and to focus on extreme events.
A weight of 2 was applied to the variables NE W , μPJmax W , NE S , and μPJmax S because they have a bigger influence on the extreme behavior of the generator than μDTOT W and μDTOT S .
It depends on the studied variables: the gap between the dates of the annual maximal daily rainfall (Dist 0), the number of common days when an event occur (Dist 1), and the number of common rainy days (Dist 2)
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Appendix: Controlling the global significance level of a multiple tests approach using the False Discovery Rate: the Benjamini and Hochberg (BH) procedure
Appendix: Controlling the global significance level of a multiple tests approach using the False Discovery Rate: the Benjamini and Hochberg (BH) procedure
Benjamini and Hochberg (1995) proposed a procedure to control the global significance level α g of a multiple tests procedure. Assuming that K tests of a null hypothesis H 0 are achieved, the BH procedure is the following:
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Let p (1) ≤ p (2) ≤ ··· ≤ p (K) be the sorted observed p-values related to the K tests;
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Compute \(m = \max{\{1 \leq j\leq K,\;p_{(j)} \leq {\frac{j}{K}} \alpha\}}\);
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3.
If m exists, then reject among the K hypothesis the m ones corresponding to p (1) ≤ ··· ≤ p (m) p-values; else reject no hypothesis.
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Cantet, P., Bacro, JN. & Arnaud, P. Using a rainfall stochastic generator to detect trends in extreme rainfall. Stoch Environ Res Risk Assess 25, 429–441 (2011). https://doi.org/10.1007/s00477-010-0440-x
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DOI: https://doi.org/10.1007/s00477-010-0440-x