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Recent trends in wind speed across Saudi Arabia, 1978–2013: a break in the stilling
Título : Recent trends in wind speed across Saudi Arabia, 1978–2013: a break in the stilling
Autor : Azorín Molina, César; Rehman, Shafiqur; Guijarro, José Antonio; McVicar, Tim R.; Minola, Lorenzo; Chen, Deliang; Vicente Serrano, Sergio Martín
Palabras clave : Wind speed; Trends; Stilling break; Teleconnection indices
Fecha de publicación : 2018
Editor: Royal Meteorological Society; Wiley
Citación : International Journal of Climatology. 2018, p. 1-19
Versión del editor: https://dx.doi.org/10.1002/joc.5423
Resumen : We analyse recent trends and variability of observed near-surface wind speed from 19 stations across Saudi Arabia (SA) for 1978–2013. The raw wind speed data set was subject to a robust homogenization protocol, and the stations were then classified under three categories: (1) coast, (2) inland and (3) mountain stations. The results reveal a statistically significant ( p < 0.05) reduction of wind speed of − 0.058 m s − 1 dec − 1 at annual scale across SA, with decreases in winter ( − 0.100 m s − 1 dec − 1 ) and spring ( − 0.066 m s − 1 dec − 1 ) also detected, being non-significant in summer and autumn. The coast, inland and mountain series showed similar magnitude and significance of the declining trends across all SA series, except for summer when a decoupled variability and opposite trends of wind speed between the coast and inland series (significant declines: − 0.101 m s − 1 dec − 1 and − 0.065 m s − 1 dec − 1 , respectively) and the high-elevation mountain series (significant increase: + 0.041 m s − 1 dec − 1 ) were observed. Even though wind speed declines dominated across much of the country throughout the year, only a small number of stations showed statistically significant negative trends in summer and autumn. Most interestingly, a break in the stilling was observed in the last 12-year (2002–2013) period ( + 0.057 m s − 1 dec − 1 ; not significant) compared to the significant slowdown detected in the previous 24-year (1978–2001) period ( − 0.089 m s − 1 dec − 1 ). This break in the slowdown of winds, even followed by a non-significant recovery trend, occurred in all seasons (and months) except for some winter months. Atmospheric circulation plays a key role in explaining the variability of winds, with the North Atlantic Oscillation positively affecting the annual wind speed, the Southern Oscillation displaying a significant negative relationship with winds in winter, spring and autumn, and the Eastern Atlantic negatively modulating winds in summer.
Patrocinador: C. A-M. has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 703733 (STILLING project). This research was supported by the research projects: Swedish BECC, MERGE, VR (2014-5320).
URI : http://hdl.handle.net/20.500.11765/8395
ISSN : 0899-8418
1097-0088
Colecciones: Artículos científicos 2015-2018


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