Urban Reanalisys

The available data sets include the air temperature and weather reports collected during the winter of 2016– 2017. In this study, we process data covering three time periods (figure 3). These periods were chosen to maximize the continuous data coverage and to meet the low solar height conditions. The first period, P1, covers a period since the beginning of observations in Nadym and Novy Urengoy (December 14th 2016) until the beginning of observations in Vorkuta and Salekhard (February 2nd 2017). The solar height during the most of the P1 period is lower than 5?. It allows the use of TL observations 24 hours a day. The P2 period covers the dates from February 2nd to March 15th of 2017. The P2 data are available for all four cities,whichmakes it convenient for theUHI intercomparison. The additional P0 period covers dates from December 14th 2016 to March 1st 2017. The P0 data characterize a typical December, January and February (DJF) winter season, which is frequently used in other climatological studies. The AWS data have significant gaps during the coldest weather conditions. The data from Nadym and Novy Urengoy are partially absent between 17th and 23rd of December and 2nd and 5th of January as the AWS (TL) measurements have the lower limit of ?41 ?C (?39.3 ?C).