Precipitation simulations on an 8×8 km grid using the PSU/NCARMesoscale Model MM5 are used to estimate the M5 and Ci statisticalparameters in order to support the M5 map used for flood estimates byIcelandic engineers. It is known a priori that especially wind anomaliesoccur on a considerably smaller scale than 8 km. The simulation period usedis 1962–2005 and 73 meteorological stations have records long enough inthis period to provide a validation data set. Of these only one station isin the central highlands, so the highland values of the existing M5 map areestimates. A comparison between the simulated values and values based onstation observations set shows an M5 average difference(observed-simulated) of −5 mm/24 h with a standard deviation of 17 mm,3 outliers excluded. This is within expected limits, computational andobservational errors considered. A suggested correction procedure bringsthese values down to 4 mm and 11 mm, respectively.
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机译：使用PSU / NCARMesoscale MM5模型在8×8 km网格上进行降水模拟，以估算M5和C i 统计参数，以支持冰岛工程师用于洪水估算的M5地图。先验地知道，特别是风异常发生的规模远小于8 km。使用的模拟期是1962年至2005年，73个气象站的记录时间足够长，可以提供验证数据集。其中只有一个站位于中央高地，因此现有M5地图的高地值是估算值。模拟值与基于站点观测值的值之间的比较显示M5平均差（观察到的模拟值）为-5 mm / 24 h，标准差为17 mm，3个离群值被排除在外。这在预期的范围内，考虑了计算和观测误差。建议的校正程序可将这些值分别减小至4 mm和11 mm。
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