The influence of aerosols - cloud interactions on precipitation formation and predictability

拟议项目的目标是通过考虑气溶胶对区域大气化学模式REMO中层状和对流云以及降水形成的影响，改进对欧洲和德国降雨量的测定。短期(天、周)和/或较长时间尺度(季节、年)的模式模拟将在欧洲进行，重点是德国。模型模拟的结果将通过与现有的地面和卫星观测进行比较来评估。关于气溶胶处理的模式改进将主要包括二次有机气溶胶的形成、气溶胶的化学成分和气溶胶的尺寸分布。为了描述气溶胶、云凝结核和云滴数浓度之间的联系，我们将在第一步中利用经验关系，并在第二步中包括(半)预报方程。

The goal of the proposed project is an improved determination of rain fall over Europe and Germany by taking into account the aerosol influence on layered and convective clouds and precipitation formation in the regional atmosphere-chemistry model REMO. Model simulations on short (days, weeks) and/or longer time scales (seasons, years) will be carried out over Europe focussing on Germany. The results of the model simulations will be evaluated by comparisons with availabe ground based and satellite observations. Model improvements concerning the aerosol treatment will include mainly secondary organic aerosol formation, aerosol chemical composition and aerosol size distribution. To describe the connection between aerosols, cloud condensation nuclei and cloud droplet number concentration we will make use of empirical relationships in a first step and include (semi-)prognostic equations in a second step.