Barely Significant

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Focusing on the MENA region, the increase in precipitable water, air temperature and dust loading seen in the summer season are also present in the colder months, although a negative trend in the cloud cover (− 0.03% year −1 ) and precipitation rate (− 2.1 × 10 −6 mm h −1 year −1 ) yield an increase (0.17 W m −2 year −1 ) in the downward shortwave radiation flux at the surface as opposed to the decrease (− 0.33 W m −2 year −1 ) seen in the warmer months (Table 3 ).