====== Global stilling ======

//Global Stilling// refers to the measured reduction in average terrestrial surface windspeeds over the last 40 years.

Measurements worldwide have shown a reduction of between 5% and 15%.

There is currently no agreed explanation of the effect.

One suggestion is that it's due to increased 'surface roughness' from urbanisation.

The stilling may be a result of climate change, or may be an independent effect which could be //affecting// climate change. (Note the reduction has implications for the future efficiency of wind-driven electricity turbines.)

A 2019 report in //Nature Climate Change// suggests, however, that the stilling process may have reversed around 2010, and could be due to decades-long climate oscillations (which are not yet quantified or understood.)

>Here, we use wind data from in situ stations worldwide to show that the stilling reversed around 2010 and that global wind speeds over land have recovered. We illustrate that decadal-scale variations of near-surface wind are probably determined by internal decadal ocean–atmosphere oscillations, rather than by vegetation growth and/or urbanization as hypothesized previously. \\ \\ Source : [[https://www.nature.com/articles/s41558-019-0622-6|Nature Climate Change ]]volume 9, pages 979–985 (2019)