Parameterizations of the Planetary Boundary Layer (PBL) embedded in numerical weather prediction models are crucial in the simulation of local meteorology and require a special investigation. In this study we evaluate simulations at 1 km horizontal resolution using six PBL schemes of the Weather Research and Forecasting model (WRF) by comparison to observations performed in a coastal port-industrial area (Civitavecchia) on the Tyrrhenian coast of Central Italy. During the measurement campaign (April 2016) three types of atmospheric circulation regimes were identified: “breeze”, “jet” and “synoptic”. Some generalizations can be inferred from the results, despite the variety of settings analyzed (two sites, three regimes in both day and night conditions). Our results show that the temperature simulation is much more sensitive to the configuration at night than during the day, especially on breeze days, when the occurrence of stable boundary layer is favored. For wind speed, non-local schemes are very similar to each other, unlike the local closure schemes.

The use of the urban Building Environment Parameterization (BEP) significantly improves the simulation of the 2 m temperature during the “jet” evenings and nights, while it entails a further overestimation of the temperature during the “breeze” days leading to a reduction of the bias.

嵌入在数值天气预报模型中的行星边界层 (PBL) 的参数化对于模拟当地气象至关重要，需要进行特殊调查。在这项研究中，我们通过与在意大利中部第勒尼安海岸的沿海港口工业区 (Civitavecchia) 进行的观测进行比较，使用天气研究和预测模型 (WRF) 的六个 PBL 方案来评估 1 公里水平分辨率的模拟。在测量活动（2016 年 4 月）期间，确定了三种类型的大气环流状态：“微风”、“急流”和“天气”。尽管分析了各种设置（两个站点，白天和黑夜条件下的三种制度），但可以从结果中推断出一些概括。我们的结果表明，温度模拟在夜间比白天对配置更敏感，特别是在有利于稳定边界层出现的微风天。对于风速，与局部封闭方案不同，非局部方案彼此非常相似。

城市建筑环境参数化 (BEP) 的使用显着改善了“急流”夜晚和夜晚期间 2 m 温度的模拟，同时它需要进一步高估“微风”期间的温度，导致减少偏见。