Development of a numerical short range forecast model of fog and visibility

在建议的研究计划中，应发展一种雾和能见度的短期数值预报模式。雾模式将以德国气象局的本地模式（LM）为基础。它将是三维的，这样就可以模拟不同种类的雾，如辐射雾、平流雾和地形雾。在第一步，将开发微型版本的LM，并在其中实现详细的光谱微物理云模块。在此基础上，提出了一种新的雾参数化方案。通过利用现有的雾集测量数据，将进行数值案例研究，以验证光谱微物理和参数化雾模型。目的是在容易形成雾的地点和特别需要高质量雾预报的地方，例如机场、高速公路等，获得一种有效的数值预报工具。本研究的部分内容被纳入欧盟委员会的COST 722行动“雾、能见度和低云的短期预报方法”。

In the proposed research project a numerical short range forecast model of fog and visibility shall be developed. The fog model will be based on the Local Model (LM) of the German Weather Service. It will be three-dimensional so that different kinds of fog, such as radiation fog, advection fog, and orographic fog, can be simulated. In a first step a microscale version of the LM will be developed and a detailed spectral microphysical cloud module will be implemented therein. Based on this module a new parameterization scheme for fog will be developed. By utilizing available data of measured fog episodes, numerical case studies will be performed in order to verify the spectral microphysical as well as the parameterized fog model. The aim is to obtain a tool for a numerically efficient fog forecast at locations which are favourable for fog formation and where a high quality fog forecast is of particular importance, e.g. at airports, highways etc. Parts of this research are embedded in the COST 722 Action "Short range forecasting methods of fog, visibility and low clouds" of the European Commission.