This study has analysed the development of the urban heat island (UHI) under various synoptic scale atmospheric circulation for two large cities – Prague in central Europe and Bucharest in south-eastern Europe, including seasonal differences and long-term changes. At the best of our knowledge, it is the first comparison between two European cities from this perspective. Analysis was conducted on the base of minimum air temperature data from pairs of urban and peri-urban stations. The average UHI intensity is 2.3 °C for Prague and 1.8 °C for Bucharest, it exceeds 4 °C in 6–10% of cases, and the highest values occur in August in both cities. The annual course of monthly mean values of UHI intensities has higher amplitude in Bucharest (1.2 °C) than Prague (0.6 °C). Synoptic scale circulation is classified according to mean sea level pressure data from ECMWF Era-Interim reanalysis using cost733class software. The results show that UHI is more intense under anticyclonic situations with southern winds in the both cities. Over 1981–2016, we found that the UHI intensity followed statistically significant increasing trend, much larger trend for Bucharest than Prague (3.3 °C vs. 1.3 °C / 100 years).

这项研究分析了两个大城市-中欧的布拉格和东南欧的布加勒斯特-在不同天气尺度大气环流下城市热岛（UHI）的发展，包括季节差异和长期变化。据我们所知，这是从这个角度来看两个欧洲城市之间的首次比较。基于来自成对的城市和城市近郊站的最低气温数据进行了分析。布拉格的平均UHI强度为2.3°C，布加勒斯特的平均UHI强度为6-10％的情况下超过4°C，这两个城市的最高值出现在8月。在布加勒斯特（1.2°C），UHI强度的月平均值的年变化幅度高于布拉格（0.6°C）。天气尺度环流是根据使用cost733class软件进行的ECMWF时代中期再分析得出的平均海平面压力数据进行分类的。结果表明，在两个城市南风的反气旋情况下，UHI更为强烈。在1981-2016年间，我们发现UHI强度遵循统计学上显着的上升趋势，布加勒斯特的趋势比布拉格大得多（3.3°C对1.3°C / 100年）。