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Cold Waves in Poznań (Poland) and Thermal Conditions in the City during Selected Cold Waves

机译：波兹南（波兰）的冷潮和部分冷潮期间城市的热状况

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摘要

The objective of the paper was to characterize the occurrence of cold days and cold waves in Poznań in the years 1966/67–2015/16, as well as to characterize thermal conditions in the city during selected cold waves in the years 2008/09–2015/16. The study was based on daily data on maximum and minimum air temperature for station Poznań-?awica from the years 1966/67–2015/16 and daily air temperature values from eight measurement points located in the territory of the city in different types of land use from the years 2008/08–2015/16. In addition, to characterize thermal conditions during selected days forming cold waves, satellite images were used, on the basis of which the land surface temperature (LST) was calculated. A cold day was defined as a day with daily maximum temperature (Tmax) below the value of 5th annual percentile of Tmax, and a cold wave was defined as at least five consecutive cold days. The study showed an increase in Tmax in winter, which translated to a decrease in the number of cold days over the last 50 years, although the changes were not statistically significant. Thermal conditions in the city showed high variability in the winter season and during the analyzed cold waves.
机译：本文的目的是描述1966 / 67-2015 / 16年波兹南发生的冷天和冷浪，并表征2008 / 09-2008年特定冷浪期间城市的热状况。 2015/16。这项研究基于1966 / 67-2015 / 16年波兹南-奥维卡气象站的最高和最低气温的每日数据，以及位于城市领土内不同土地类型的八个测量点的每日气温值从2008 / 08-2015 / 16年开始使用。另外，为了表征形成冷浪的选定日期的热状况，使用了卫星图像，在此基础上计算了地表温度（LST）。寒冷的日子被定义为每日最高温度（Tmax）低于Tmax的第5个百分位数的一天，寒冷的浪潮被定义为至少连续五个寒冷的日子。这项研究表明，冬季的Tmax有所增加，这意味着过去50年的寒冷天数减少了，尽管变化在统计上并不显着。在冬季和分析的寒潮期间，城市的热状况表现出很大的变化。

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