Detection of trends and break points in temperature: the case of Umbria (Italy) and Guadalquivir Valley (Spain)
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The increase of air surface temperature at global scale is a fact with values around 0.85 °C since the late nineteen century. Nevertheless, the increase is not equally distributed all over the world, varying from one region to others. Thus, it becomes interesting to study the evolution of temperature indices for a certain area in order to analyse the existence of climatic trend in it. In this work, monthly temperature time series from two Mediterranean areas are used: the Umbria region in Italy, and the Guadalquivir Valley in southern Spain. For the available stations, six temperature indices (three annual and three monthly) of mean, average maximum and average minimum temperature have been obtained, and the existence of trends has been studied by applying the non-parametric Mann–Kendall test. Both regions show a general increase in all temperature indices, being the pattern of the trends clearer in Spain than in Italy. The Italian area is the only one at which some negative trends are detected. The presence of break points in the temperature series has been also studied by using the non-parametric Pettit test and the parametric standard normal homogeneity test (SNHT), most of which may be due to natural phenomena.
KeywordsTrend Temperature Break points Homogeneity tests
The authors want to acknowledge the kindness and help of Jose Carlos González-Hidalgo with providing the temperature data of the Guadalquivir Valley stations from the database MOTEDAS.
Compliance with ethical standards
Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
- Aguilar E, Auer I, Brunet M, Peterson TC, Wieringa J (2003) Guidelines in climate metadata and homogenization. WCDMP No. 53, WMO-TD No. 1186. WMO. Geneva. SwitzerlandGoogle Scholar
- Brunet M, Sigro J, Saladie O, Aguilar E, Jones P, Moberg A, Walther A, Lopez D (2005) Spatial patterns of long-term Spanish temperature change. Geophys Res Abstr 7:04007Google Scholar
- IPCC (2014) Climate change 2014: synthesis report. Fifth Assessment report, Ginebra, SuizaGoogle Scholar
- Kendall MG (1975) Rank correlation methods. Ed, Charles Griffin, LondonGoogle Scholar
- Llorente M (2012) Tendencias españolas de variables agrometeorológicas en los últimos 30 años. Departamento de Producción Vegetal, Universidad Politécnica de Madrid, ETSIA, p 99Google Scholar
- Morales CG, Ortega MT, Labajo JL, Piorno A (2005) Recent trends and temporal behavior of thermal variables in the region of Castilla–Leon (Spain). Atmosfera 18:71–90Google Scholar
- Pandžić K, Likso T (2010) Homogeneity of average air temperature time series for Croatia. Int J Climatol 30:1215–1225Google Scholar
- Sousa A, García-Barrón L, Jurado V (2007) Climate change in Andalusia: trends and environmental consecuences. Consejería de Medio Ambiente. Junta de AndalucíaGoogle Scholar