Abstract
The human-biometeorological conditions in Ukraine during two mega-heat waves were analyzed. The evaluation is based on physiologically equivalent temperature (PET). The calculation of PET is performed utilizing the RayMan model. The results revealed these two mega-heat waves produced strenuous human-biometeorological conditions on the territory of Ukraine. During the summer 2010 mega-heat wave, strong and extreme heat stress prevailed at about midday at the stations where this atmospheric phenomenon was observed. The mega-heat wave of August 2015 was characterized by a lower heat load. The diurnal variation of PET values during the researched mega-HW was similar to that of the diurnal variation of air temperature with minimum values in the early morning and maximum values in the afternoon. On the territory where mega-heat waves were observed, the number of days during which heat stress occurred for 9 h amounted to 97.6% for the period from 31 July to 12 August 2010 and 77.1% for the mega-heat wave of August 2015.
Highlights
A heat wave is a meteorological phenomenon that consists of abnormally hot weather conditions, lasting several days or longer, and that belongs to the atmosphere’s synopticscale circulation
Strong and extreme heat stress prevailed at 12 UTC during the period from 31 July to 12 August 2010 at the stations where the heat wave was observed
The results showed that these two mega-heat waves produced the strenuous human-biometeorological conditions on the territory of Ukraine
Summary
A heat wave is a meteorological phenomenon that consists of abnormally hot weather conditions, lasting several days or longer, and that belongs to the atmosphere’s synopticscale circulation. Heat waves are known to have a negative effect on the human body [1] This phenomenon always influences human thermal comfort conditions and can lead to marked short-term increases of morbidity and mortality [2,3,4]. Nowadays two approaches in investigating the heat load on the human body are most common: (1) assessment of heat stress based on thermal indices and (2) evaluation of excess mortality The latter approach is very popular for the reasons of data availability because it is much harder to accurately estimate impacts of the thermal environment on morbidity, as well as the well-being and efficiency of the human organism. Sfîcă et al [23] have shown that the advection is one of the two major types of heat waves generating conditions
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