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Mean temperature evolution on the Spanish mainland 1916-2015

Leire Sandonis, José Carlos González-Hidalgo*, Dhais Peña-Angulo, Santiago Beguería

*Corresponding author:

ABSTRACT: An analysis of the evolution of annual and seasonal mean temperature on the Spanish mainland (western Mediterranean basin) was carried out, using the new MOTEDAS_century dataset (MOnthly TEmperature Dataset of Spain century). This dataset was developed by combining archives from the National Meteorological Agency and newly digitised legacy data from Annual Books published between 1916 and 1949. The annual regional mean temperature series, as well as the seasonal ones, experienced increasing trends during the study period. However, the increment was neither constant in time (monotonic) nor homogeneous between seasons. Four main periods were identified in the annual mean regional series. The first three corresponded to those previously confirmed in global temperature series (rise-pause-rise), and a second pause or hiatus was also detected at the end of the period of analysis. Seasonal regional series followed specific patterns. Thus, winter mean temperature only increased in the second rising period, autumn in the first one and spring and summer during the two rising periods. Also, negative trends were found in extended areas in the first pause in spring, and to a lesser extent in summer. From the middle of the 1980s, the trends in annual and seasonal mean values were not significant until 2015. Furthermore, spatial variations were found in the significance of the trends, revealing regional differences in the intensity of warming through the seasons. In comparison with other versions of secular mean temperature series developed for the Spanish mainland, MOTEDAS_century seems to capture better the spatial variability.