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

了解沙尘沉积的机理，建立沙尘沉积的量化能力，对全球养分循环和全球气候变化等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，尘埃模型得到了积极的发展。粉尘建模界面临的一个主要挑战是如何将粉尘沉积参数化。这是一个涉及许多环境因素的复杂动态过程。缺乏高质量的降尘测量和久经考验的降尘方案，以及降尘预测存在较大的不确定性，已成为制约整个研究领域发展的严重瓶颈。在本项目中，我们计划对粉尘沉积机制进行风洞研究。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粒度组、流速和表面条件。风洞实验将为测试粉尘沉积方案提供基准数据集。我们计划使用这些测量来校准两种现有的粉尘沉积方案，并检查这些方案在粉尘建模系统中的性能。

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.