Characteristics of the Near-Surface Boundary Layer within a Mountain Valley during Winter
Characteristics of the Near-Surface Boundary Layer within a Mountain Valley during Winter
复制标题
DOI：
10.1175/jamc-d-11-058.1
复制
发表时间：
2012-03
影响因子：
3
通讯作者：
W. Helgason;J. Pomeroy
中科院分区：
文献类型：
--
作者：
W. Helgason;J. Pomeroy
在山区，估算地表与大气之间的感热和水汽交换是一项重要但不精确的奋进。在复杂的山区地形中，对近地面边界层湍流特性的测量相对较少，导致在应用通量梯度技术估算地面湍流热量和质量通量方面存在相当大的不确定性。在加拿大落基山脉内的卡纳纳斯基斯河谷，在7公顷的积雪覆盖的森林清除近地面边界层进行了调查。均匀的测量地点的特点是相对平静和庇护;风表现出相当大的不稳定性，但是。频繁的阵风被观测到将湍流能量输送到空地，影响了雪表面的能量传输速率。由此产生的边界层内的清除表现出扰动所介绍的周围环境…
AbstractWithin mountainous regions, estimating the exchange of sensible heat and water vapor between the surface and the atmosphere is an important but inexact endeavor. Measurements of the turbulence characteristics of the near-surface boundary layer in complex mountain terrain are relatively scarce, leading to considerable uncertainty in the application of flux-gradient techniques for estimating the surface turbulent heat and mass fluxes. An investigation of the near-surface boundary layer within a 7-ha snow-covered forest clearing was conducted in the Kananaskis River valley, located within the Canadian Rocky Mountains. The homogeneous measurement site was characterized as being relatively calm and sheltered; the wind exhibited considerable unsteadiness, however. Frequent wind gusts were observed to transport turbulent energy into the clearing, affecting the rate of energy transfer at the snow surface. The resulting boundary layer within the clearing exhibited perturbations introduced by the surroundin...