We have investigated the relationship between the inflow of air masses and the ragweed pollen concentration in SW Poland (Wrocław) for a 10-year period of 2005–2014. The HYSPLIT trajectory model was used to verify whether episodes of high concentrations can be related to regions outside of the main known ragweed centres in Europe, like Pannonian Plain, northern Italy and Ukraine. Furthermore, we used two different meteorological data sets (the global GDAS data set and from the WRF mesoscale model; the meteorological parameters were: U and V wind components, temperature and relative humidity) into HYSPLIT to evaluate the influence of meteorological input on calculated trajectories for high concentration ragweed episodes. The results show that the episodes of high pollen concentration (above 20 pm−3) represent a great part of total recorded ragweed pollen in Wrocław, but occur rarely and not in all years. High pollen episodes are connected with air masses coming from south and south-west Europe, which confirms the existence of expected ragweed centres but showed that other centres near Wrocław are not present. The HYSPLIT simulations with two different meteorological inputs indicated that footprint studies on ragweed benefit from a higher resolution meteorological data sets.

中文翻译：

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抵达波兰西南部的豚草花粉来源地区及气象数据对HYSPLIT模型结果的影响

我们在 2005 年至 2014 年的 10 年间调查了波兰西南部（弗罗茨瓦夫）的气团流入量与豚草花粉浓度之间的关系。HYSPLIT 轨迹模型用于验证高浓度事件是否与欧洲主要已知豚草中心以外的地区有关，如潘诺尼亚平原、意大利北部和乌克兰。此外，我们在 HYSPLIT 中使用了两个不同的气象数据集（全球 GDAS 数据集和来自 WRF 中尺度模型；气象参数是：U 和 V 风分量、温度和相对湿度）到 HYSPLIT 中来评估气象输入对计算轨迹的影响用于高浓度豚草发作。结果表明，在弗罗茨瓦夫记录的豚草花粉总量中，高花粉浓度事件（下午 20 点-3 点以上）占很大一部分，但很少发生，并非在所有年份都发生。高花粉事件与来自欧洲南部和西南部的气团有关，这证实了预期的豚草中心的存在，但表明弗罗茨瓦夫附近的其他中心不存在。具有两种不同气象输入的 HYSPLIT 模拟表明，豚草足迹研究受益于更高分辨率的气象数据集。