Abstract
In the present study, trends in sunshine duration were investigated using the Mann–Kendall test in different timescales under the humid climatic conditions of Dibrugarh (Assam), Northeast India. Statistically significant decreasing trends were observed in the sunshine duration in the range of (−)0.61 to (−)1.28 h/decade over Dibrugarh in different timescales: annual; seasonal: winter; and monthly: January, June, and November during the past 28 years from 1981 to 2008. On the other hand, the significant increasing trend in sunshine duration was observed at the rate of (+)0.69 h/decade in the month of September over Dibrugarh. The observed decreasing trends in sunshine duration support the existence of the phenomenon of dimming over Northeast India, which may affect the water requirements in the region.
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