Air pollution is pushing wind speed into a regulator of surface solar irradiance in China

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Video in TIB AV-Portal: Air pollution is pushing wind speed into a regulator of surface solar irradiance in China

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Air pollution is pushing wind speed into a regulator of surface solar irradiance in China
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Analysis in 27 cities across China shows that surface solar irradiance (SSI) and wind speed track similar decadal trends in 1961–2011, suggesting wind speed as a possible regulator of SSI. This assumption is further confirmed by the continuously widening gap in annually averaged daily SSI between windy and windless clear-sky days with worsening air pollution. Wider gaps are noted for more polluted cities and seasons. The gap in SSI between windy and windless conditions could therefore serve as a good indicator for air quality. The regulatory effect of wind speed on SSI starts to be important when air pollution index exceeds the boundary of 125. A plausible mechanism of wind speed regulating SSI through interactions with aerosols is proposed. There are two cut-off points of 2.5 m s−1 and 3.5 m s−1 wind speeds. Winds <2.5 m s−1 noticeably disperse air pollutants and thereby enhance SSI. Above the 2.5 m s−1 threshold, air pollution and SSI become largely insensitive to changing wind speeds. Winds in excess of 3.5 m s−1 could enhance aerosol concentration probably by inducing dust-storms, which in turn attenuate SSI.

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