【摘要】 基于冰川表碛上的空气动力学粗糙度z0是表征表碛上空气动力学性质和估算其上能量平衡中的重要参数,利用科其喀尔冰川3号观测站涡动相关系统的2009年观测数据,采用无因次化风速法,对其表碛上冰川消融前期和消融期的z0进行了分析。结果表明,在冰川消融前期z0为0.101 m,消融期z0值在0.093~0.098 m之间,表明积雪对z0的影响显著;大气处于不稳定层结时,z0值较大,处于稳定层结时,z0值较小;风速不变时,z0随摩擦速度的增大而增大;摩擦速度不变时,z0随风速的增大而减小。更多还原

【Abstract】 Aerodynamic roughness length z0 is an important aerodynamic parameter in representing the aerodynamic properties and estimating on the energy balance of the surface moraine. The aerodynamic roughness length in the pre-ablation and ablation period at No. 3 site of the Koxkar Baxi Glacier were calculated using the single dimensional wind speed method and the data from the eddy covariance system in 2009. The results show that z0was 0. 101 m in the pre-ablation period and was ranged from 0. 093 m to 0. 098 m in the ablation period. The influenced of snow covering on the surface on z0 was greatly. On the snow-covered surface,z0 was bigger. The z0 in unstable air condition was big but in stable air condition was small. When the wind speed was constant,z0 increased with the friction velocity increasing; when the friction velocity was constant,z0 decreased with the wind speed increasing.更多还原