| 摘 要： |
The diurnal temperature range (DTR) has generally decreased at global scale according to the IPCC reports and previous publications. Here, we examined the change in DTR within the past four decades and found that DTR decreased in wet areas, but it increased in dry areas. This is because the daily minimum air temperature (Tmin) increased at a slower rate than the daily maximum air temperature (Tmax) in the dry areas, while it increased more rapidly in the wet areas. The changes in cloud cover, water vapour and moisture flux were observed to have contributed to the observed change in DTR. The change in moisture flux largely contributed to this change through the indirect effect on the change in water vapour across the aridity gradient. The significant impact of moisture flux is linked to the differential change in moisture flux between the dry and wet zones. No significant change in diurnal temperature range in recent decades over global land areas as a whole. Significant increase in diurnal temperature range in the dry areas but decrease in the wet areas. Changes in cloud cover, water vapour and moisture flux influence the decrease in diurnal temperature range along the aridity gradient.image |
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