巴丹吉林沙漠湖泊-沙山地貌格局对局地小气候的影响

通过对巴丹吉林沙漠腹地湖泊和沙山两测点不同气象要素的同期观测,对比分析了湖泊和沙漠区地表辐射特征、能量平衡、地表反照率、散度场和风沙环境等差异。结果表明,湖泊区的气压要比沙漠区高,在观测期内,平均高出约243hPa;沙山处摩阻速度的平均值为0.31m/s,而同期湖泊处为0.24m/s;散度场(D)与湖泊中心的垂直速度场具有很好的相关性,夜晚,D0时,湖泊中心有下沉气流,垂直风速为负值;而白天,D0时,湖泊中心气流上升,垂直风速为正值,存在一定的局地环流。

Influences of Lake-Sand Dune Landscape on Local Microclimate in Badain Jaran Desert

By observing meteorological elements of lakes and sand dunes in Badan Jaran Desert hinterland over the same period, authores made comparative analysis on radiation characteristics, energy balance, albedo, divergence and sand environment differences between the lake and desert surface. The results showed that the air pressure of lake surface was higher than that of the desert area, with an average of about 2.43 kPa. The drag velocity was 0.31 m/s on dune surface, while it was 0.24 m/s on lakes. The divergence field(D) had a good correlation with the vertical velocity at lake center. In the evening, when D was greater than zero, the center of the lake airflow was sinking, and the vertical velocity was negative; while in the daytime, when D was less than 0, the center of the lake flow was rising, and vertical wind speed was positive, indicating that there was a certain amount of local circulation.