The diurnalrange of temperature indicated a U-shaped pattern along the altitudinal gradient, with a lowest value at the middle elevations (about 1600 m).
月平均的日较差沿着海拔高度变化呈“U”字形，中海拔月平均日较差值最低。
2
And decreases in diurnal temperature range and wind speed were found to be the main influencing factors leading to the decrease of pan evaporation.
The daily maximum surface temperature appears on the coping of the sand dune, the minimum temperature and the greatest diurnal temperature range appear on the windward slop.