Trend assessment of sunshine duration, cloudiness, and reference evapotranspiration for exploring global dimming/brightening in Tehran

Recent studies have shown global warming as a deterministic phenomenon, while assessment of changes in specific variables such as sunshine duration, cloud cover and the amount of solar radiation at ground level increase uncertainties about this phenomenon in response to increasing greenhouse gases. Assessment studies of the mentioned variables have suggested the existence of a global dimming/brightening phenomenon in recent decades. In order to...