Cold Pool‐Land Surface Interactions in a Dry Continental Environment
Cold Pool‐Land Surface Interactions in a Dry Continental Environment
复制标题
干燥大陆环境中的冷池-陆地表面相互作用
DOI：
10.1029/2018ms001323
复制
发表时间：
2018
影响因子：
6.8
通讯作者：
S. C. van den Heever
中科院分区：
文献类型：
--
作者：
L. Grant;S. C. van den Heever
冷池影响对流的启动和组织，灰尘放样，和边界层特性，但很少有人知道他们与陆地表面的相互作用，特别是在干燥的大陆环境。在这项研究中，双向冷池陆面相互作用的研究使用高分辨率的理想化模拟孤立的，瞬态冷池在干燥的对流边界层演变。结果表明，由于陆面冷却的空间格局以及气温和风速的扰动，感热通量在冷池中心被抑制，而在边缘被增强。这导致冷池从边缘向内消散。潜热通量主要在冷池内受到抑制，这种抑制的幅度由大气和地表效应之间的竞争控制。通过比较完全交互式陆面模拟与施加表面通量的模拟，陆面冷池反馈显示冷池寿命，范围和强度减少了50%，并影响边界层湍流动能恢复的模式，这对冷池诱导的对流开始有重要意义。
Cold pools influence convective initiation and organization, dust lofting, and boundary layer properties, but little is known about their interactions with the land surface, particularly in dry continental environments. In this study, two‐way cold pool‐land surface interactions are investigated using high‐resolution idealized simulations of an isolated, transient cold pool evolving in a dry convective boundary layer. Results using a fully interactive land surface demonstrate that sensible heat fluxes are suppressed at the center of the cold pool but enhanced at the edge due to the spatial patterns of land surface cooling and the air temperature and wind speed perturbations. This leads to cold pool dissipation from the edge inward. Latent heat fluxes are primarily suppressed within the cold pool, and the magnitude of this suppression is controlled by competition between atmospheric and land surface effects. By comparing the fully interactive land surface simulation to a simulation with imposed surface fluxes, the land surface‐cold pool feedbacks are shown to reduce the cold pool lifetime, extent, and intensity by up to 50% and influence the pattern of boundary layer turbulent kinetic energy recovery, which have significant implications for cold pool‐induced convective initiation.