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The occurrence of the heat waves in Europe and their circulation and synoptic conditions

Arkadiusz Tomczyk

Abstract

Heat waves are considered extreme weather phenomena, first of all, due to high air temperatures observed during their occurrence. Despite numerous studies concerning extreme weather phenomena, including heat waves, there is still a lack of works based on long data series and similar methodological assumptions. Most of the available studies are focused on the analysis of the selected heat waves and their impact on mortality caused by biometeorological conditions affecting human body systems. Given the great threat to human life and health related to the occurrence of heat waves, the results presented in this article may prove to be interesting to a wide and diverse group of readers. The main objective of the PhD thesis was determining synoptic conditions causing the occurrence of heat waves in Europe. The implementation of the main objective was preceded by determination of temporal and spatial variability of heat wave occurrence within the analysed area, definition of atmospheric circulation types conducive to the occurrence of heat waves and description of thermal and pressure conditions during the selected heat waves. The increase in Tmax observed in the analysed area is simultaneous with an increase in a number of hot days and, consequently, with an increase in the frequency of the occurrence of heat waves. The occurrence of heat waves within the analysed areas was related to the presence of high pressure systems providing advection of warm and dry air masses and strong insolation with cloudlessness or a small cloud cover. Positive SLP, z500 hPa and T850 anomalies were observed during the heat waves. z500 hPa positive anomalies showed the warm air masses settling over and it is connected with a relation between temperature and air density and the resulting pressure changing with height in different thermal conditions. Warm air masses are characterised by lower density than cool masses thus pressure dropping with height is slower. What is more, the presence of warm air masses were confirmed by T850 anomalies which usually reached the highest values over the analysed area.
Record ID
UAMa541898a6b22498cba5553a953b87d49
Diploma type
Doctor of Philosophy
Author
Arkadiusz Tomczyk (FoGaGS) Arkadiusz Tomczyk,,
Title in Polish
Występowanie fal upałów w Europie oraz ich cyrkulacyjne i synoptyczne uwarunkowania
Title in English
The occurrence of the heat waves in Europe and their circulation and synoptic conditions
Language
  • pl Polish
  • en English
Certifying Unit
Faculty of Geographical and Geological Sciences (FoGaGS)
Discipline
geography / (Earth sciences domain) / (biological sciences)
Scientific discipline (2.0)
6.7 Earth and related environmental sciences
Defense Date
19-04-2017
End date
19-04-2017
Supervisor
URL
http://hdl.handle.net/10593/17612 opening in a new tab
Keywords in English
heat wave, atmospheric circulation, Europe
Abstract in English
Heat waves are considered extreme weather phenomena, first of all, due to high air temperatures observed during their occurrence. Despite numerous studies concerning extreme weather phenomena, including heat waves, there is still a lack of works based on long data series and similar methodological assumptions. Most of the available studies are focused on the analysis of the selected heat waves and their impact on mortality caused by biometeorological conditions affecting human body systems. Given the great threat to human life and health related to the occurrence of heat waves, the results presented in this article may prove to be interesting to a wide and diverse group of readers. The main objective of the PhD thesis was determining synoptic conditions causing the occurrence of heat waves in Europe. The implementation of the main objective was preceded by determination of temporal and spatial variability of heat wave occurrence within the analysed area, definition of atmospheric circulation types conducive to the occurrence of heat waves and description of thermal and pressure conditions during the selected heat waves. The increase in Tmax observed in the analysed area is simultaneous with an increase in a number of hot days and, consequently, with an increase in the frequency of the occurrence of heat waves. The occurrence of heat waves within the analysed areas was related to the presence of high pressure systems providing advection of warm and dry air masses and strong insolation with cloudlessness or a small cloud cover. Positive SLP, z500 hPa and T850 anomalies were observed during the heat waves. z500 hPa positive anomalies showed the warm air masses settling over and it is connected with a relation between temperature and air density and the resulting pressure changing with height in different thermal conditions. Warm air masses are characterised by lower density than cool masses thus pressure dropping with height is slower. What is more, the presence of warm air masses were confirmed by T850 anomalies which usually reached the highest values over the analysed area.

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAMa541898a6b22498cba5553a953b87d49/

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