Regional Modeling of the Saharan Dust Cycle

该项目的核心是开发一个基于物理的北方非洲沙尘循环预测中尺度模型系统，通过整合和调整描述沙尘排放、传输和沉积各个方面的多个现有和新开发的子模型来模拟空间和时间变化。北方非洲沙尘性质的演变。此外，我们将评估大气对撒哈拉沙尘辐射强迫的响应，并通过伴随的拉格朗日过程研究模拟远距离传输的非洲沙尘对云微物理的影响。北方非洲是现代气候条件下粉尘排放的主要来源。作为“撒哈拉矿物粉尘实验”研究小组SAMUM的一部分，该项目将利用计划中的实地活动，这将提供广泛的数据集来验证和约束粉尘模型。有必要开发一个完全机械的模型，以便能够预测北方非洲沙尘循环的未来变化，例如，对辐射收支的影响，从而对地中海欧洲的气候产生影响。然而，作为我们模型验证策略的一部分，我们将进行模拟，其中关键组件（例如，源区、植被覆盖）的数据。这将使我们能够确定单个组件的模拟效果，并为进一步的模型开发提供指导方针。我们将探讨如何在这一建模工作中学到的经验教训，可以重新应用于全球模型，通过广泛的敏感性测试，检查参数化的小规模的输入和过程的可变性的方法。该项目的一个重要问题是进行关于远距离迁移的撒哈拉尘埃对大气辐射和微观物理影响的过程研究。

The core of this project is the development of a physically based predictive mesoscale model system of the northern African dust cycle by integrating and adapting several existing and newly developed sub-models describing various aspects of dust emission, transport and deposition to simulate the spatial and temporary evolution of northern African dust properties. In addition, we will evaluate atmospheric response to the radiative forcing by Saharan dust, and simulate the influence of long-range transported African dust on cloud microphysics by accompanying Lagrangian process studies. Northern Africa ist the major source of dust emissions under modern climate conditions. As part of the Research Group "SAharan Mineral dUst experiMent" SAMUM the project will capitalize on the planned field campaign, which will provide extensive datasets to validate and constrain the dust model. It is necessary to develop a fully mechanistic model in order to be able to predict future changes in the northern African dust cycle, which could, e.g., impact on the radiative budget and hence climate of Mediterranean Europe. However, as part of our model validation strategy, we will make simulations in which key components (e.g., source areas, vegetation cover) are prescribed using satellite derived and field derived data. This will enable us to determine how well individual components are simulated and provide guidelines for further model development. We will explore how the lessons learned in this modeling exercise can be reapplied in global models through extensive sensitivity tests examining methods of parameterizing small-scale variability in inputs and processes. An important issue of the project is the performance of process studies on the influence of long-range transported Saharan dust on atmospheric radiation and microphysics.