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Numerical modelling of pollen dispersion on the regional scale

机译：区域尺度上花粉弥散的数值模拟

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New parameterisations were developed to calculate the emission and resuspension flux of pollen grains. These new parameterisations were included in the comprehensive mesoscale model system KAMM/DRAIS. Two types of simulations were performed. In the first case, horizontally homogeneous meteorology was assumed. In this case, pollen concentration rapidly decreased with the distance from the source. In the second case, where the fully three-dimensional model was applied, atmospheric lifetime of the pollen grains increased remarkably. This was mainly caused by the vertical wind speeds induced by topographic effects. Consequently, the pollen 'grains could travel much larger distances until they were deposited and finally removed from the atmosphere. This is an important finding with respect to the problem of cross pollination. Due to the lack of measurements, a number of parameters had to be assumed. However, the parameterisation proposed may well serve as a starting point of a daily pollen forecast with numerical models.
机译：开发了新的参数设置来计算花粉颗粒的排放和重悬浮通量。这些新的参数化已包含在全面的中尺度模型系统KAMM / DRAIS中。进行了两种类型的模拟。在第一种情况下，假设水平气象均匀。在这种情况下，花粉浓度随着距源的距离而迅速降低。在第二种情况下，如果使用完全三维模型，则花粉颗粒的大气寿命显着增加。这主要是由地形效应引起的垂直风速引起的。因此，花粉粒可以传播更大的距离，直到它们被沉积并最终从大气中清除。这是关于异花授粉问题的重要发现。由于缺乏测量，必须假设许多参数。但是，建议的参数化很可能用作使用数值模型进行每日花粉预测的起点。

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