Data files from measurements of natural airflow within a Stevenson screen, submitted to Geoscientific Instrumentation (EGU). Excel format.

This dataset contains the raw data and analyses of a three month field experiment in which airflow within a UK-standard Stevenson screen was measured using a sensitive sonic anemometer, and comparisons made usingwith simultaneous wind speed and direction records from the same site. The averagemean in-screen ventilation rate was found to be 0.2 m s-1, (median 0.18 m s-1), well below the 1 m s-1 minimum assumed in meteorological and design standard references, and only about 7% of the scalar mean wind speed at 10 m. Low in-screen ventilation results in increased uncertainty of air temperature and humidity measurements made within Stevenson-type thermometer screens, particularly those due to the differing response times of dry- and wet-bulb temperature sensors, and ambiguity in the value of the psychrometric coefficient.

本数据集包含一项为期三个月的野外实验的原始数据与分析结果。该实验采用高灵敏度超声风速仪（sonic anemometer），对符合英国标准的斯特文森百叶箱（Stevenson screen）内部的气流进行了测量，并同步采用同一观测站点的风速与风向记录开展对比分析。研究发现，百叶箱内的平均通风速率为0.2 m s⁻¹（中位数为0.18 m s⁻¹），远低于气象与设计标准参考中假定的1 m s⁻¹最低阈值，仅为10米高度标量平均风速的约7%。百叶箱内部通风速率偏低会导致斯特文森型测温百叶箱内的气温与湿度测量不确定性升高，尤其是由干湿球温度传感器响应速率差异引发的不确定性，以及湿度系数（psychrometric coefficient）取值的模糊性问题。