Seasonality, interannual variability, and linear tendency of wind speeds in the northeast Brazil from 1986 to 2011.

[ 1 ] have shown a decreasing trend in their historical series of average annual wind speeds for weather stations in the NEB region (Caravels-BA; Parnaíba Sul region-PI; Maceió-AL).

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[ 3 ] considered two different periods (1975–2006 and 1989–2006) and observed a negative trend for wind speeds at 2 m and a positive one for those at 10 m from the surface.

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A positive Z value indicates a positive trend, while a negative Z value points to a negative trend.

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Rehman [ 31 ] performed a statistical trend analysis with the Mann-Kendall method on the average annual data for the entire time series (1970–2006) from stations located in Saudi Arabia.

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