Heat stress in urban and suburban landscape and its spatial differentiation on the example of a medium-sized Central European city
In according to researches focused on recent climate warming in the Central Europe, the study of heat stress in urban and suburban landscape in this region is indicated as an important topic. Based on measurements of station network in Olomouc (Czech Republic), the temporal and spatial variability of heat stress in the Olomouc region was analysed. We can find limits of temperature and so called Humidex negatively affecting the human organism in the literature. Due to detailed statistical analysis of collected data was possible to recognize significant differences between locations registering long periods of high temperatures and locations with long periods of critical values of Humidex. The longest period with exceeding the threshold temperatures were occurred in the mixed areas of open midrise development (LCZ 5) and open spaces with low proportion of built-up areas (LCZ 9). Areas connected with a long periods of critical values of Humidex besides high temperatures are also influenced by high evaporation associated with irrigation, waterlogged soil and water bodies. On the other hand, the shortest period of critical values of Humidex were identified in the city centre with dense pattern of midrise building (LCZ2) and in zones suggesting more vegetation, near forests (LCZ B) etc. It indicates that water vapour pressure field does not correspond with temperature field and therefore significantly modifies the spatial and temporal variability of heat stress in the city and its surroundings. Consequently, the further research of spatial variability of humidity in areas with a high population density is required.