A Wind-tunnel Study on Dust-deposition Mechanics and Validation of Dust-deposition Schemes

了解尘埃沉积的机制并发展其量化能力，对于包括全球营养循环和全球气候变化在内的一系列地球环境研究领域具有重要意义。自20世纪80年代以来，粉尘模型一直在积极开发中。尘埃模型界面临的一个主要挑战是如何将尘埃沉积参数化。这是一个复杂的动态过程，涉及多个环境因素。缺乏高质量的尘埃沉降测量和经过充分测试的尘埃沉积方案，以及尘埃沉降预测的很大不确定性，一直是整个研究领域发展的严重瓶颈。在这个项目中，我们计划开展一项关于尘埃沉积机理的风洞研究。粉尘浓度和粉尘颗粒速度将使用基于激光的仪器测量不同颗粒大小组、流速和表面条件。风洞实验将产生一个基准数据集，用于测试尘埃沉积方案。我们计划利用这些测量结果来校准现有的两种尘埃沉积方案，并在尘埃模拟系统中检验这两种方案的性能。

To understand the mechanisms of dust deposition and to develop the capacity for its quantification are important to a range of earth-environment research fields, including global nutrient cycle and global climate change. Dust models have been under active development since the 1980s. A major challenge facing the dust modeling community is how dust deposition can be parameterized. This is a complex dynamic process involving a number of environmental factors. The lack of high-quality dust-deposition measurements and well-tested dust-deposition schemes and the large uncertainties in the dust-deposition predictions have been a serious bottle neck to the development of the entire research field. In this project, we plan to carry out a wind-tunnel study on dust deposition mechanisms. Dust concentration and dust-particle velocity will be measured using laser-based instruments for various particle-size groups, flow velocities and surface conditions. The wind-tunnel experiments will produce a benchmark data set for testing dust-deposition schemes. We plan to use the measurements to calibrate two existing dust-deposition schemes and examine the performances of these schemes in a dust modeling system.