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Volume 13, issue 12 | Copyright

Special issue: 14th Plinius Conference and MEDEX Final Conference

Nat. Hazards Earth Syst. Sci., 13, 3235-3248, 2013
https://doi.org/10.5194/nhess-13-3235-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 13 Dec 2013

Research article | 13 Dec 2013

Trends and variability in extreme precipitation indices over Maghreb countries

Y. Tramblay1, S. El Adlouni2, and E. Servat1 Y. Tramblay et al.
  • 1IRD – HydroSciences Montpellier (UMR5569, CNRS, IRD, UM1, UM2), Case MSE, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
  • 2Université de Moncton, Département de Mathématique et Statistique, NB, Canada

Abstract. Maghreb countries are highly vulnerable to extreme hydrological events, such as floods and droughts, driven by the strong variability of precipitation. While several studies have analyzed the presence of trends in precipitation records for the Euro-Mediterranean basin, this study provides a regional assessment of trends on its southernmost shores. A database of 22 stations located in Algeria, Morocco and Tunisia with between 33 and 59 yr of daily precipitation records is considered. The change points and trends are analyzed for eleven climate indices, describing several features of the precipitation regime. The issue of conducting multiple hypothesis tests is addressed through the implementation of a false discovery rate procedure. The spatial and interannual variability of the precipitation indices at the different stations are analyzed and compared with large-scale atmospheric circulation patterns, including the North Atlantic Oscillation (NAO), western Mediterranean Oscillation (WEMO), Mediterranean Oscillation (MO) and El Niño–Southern Oscillation (ENSO). Results show a strong tendency towards a decrease of precipitation totals and wet days together with an increase in the duration of dry periods, mainly for Morocco and western Algeria. On the other hand, only a few significant trends are detected for heavy precipitation indices. The NAO and MO patterns are well correlated with precipitation indices describing precipitation amounts, the number of dry days and the length of wet and dry periods, whereas heavy precipitation indices exhibit a strong spatial variability and are only moderately correlated with large-scale atmospheric circulation patterns.

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