Circulation Conditions’ Effect on the Occurrence of Heat Waves in Western and Southwestern Europe

Tomczyk, Arkadiusz M.; Półrolniczak, Marek; Bednorz, Ewa

doi:10.3390/atmos8020031

Cited by 39 publications

(33 citation statements)

References 41 publications

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“…The mean T max during the heat waves analysed was 30.5 • C, while T min was 16.2 • C ( Table 2). The highest mean T max was found during the heat wave of 1992 (6-11 August), which was 33.9 • C, while the lowest average T max value, which was 28.9 • C, was seen in 1992 (24-28 July), 1997 (22-27 August) and 2001 (26)(27)(28)(29)(30). During the longest heat wave, i.e., that lasting from 21 July to 7 August, 1994, the average T max was 32.1 • C, while the average T min was 16.1 • C. A total of 10 heat waves were recorded in the city, of which five heat waves occurred at every measuring point.…”

Section: Hot Days and Heat Waves In The Years 1966-2015 (Poznań-ławica)mentioning

confidence: 94%

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Thermal Conditions in the City of Poznań (Poland) during Selected Heat Waves

2018

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Abstract:The aim of the study was to characterise the occurrence of hot days and heat waves in Poznań in the 1966-2015 period, as well as to describe the thermal conditions in the city during selected heat waves between 2008 and 2015. The basis of the study was the daily maximum and minimum air temperature values for Poznań-Ławica station from 1966-2015 and the daily values of air temperature from eight measuring points located in the city in various land types from 2008 to 2015. A hot day was defined as a day with T max above the 95th annual percentile (from 1966 to 2015), while a heat wave was assumed to be at least five consecutive hot days. The research study conducted shows the increase of T max , number of hot days and frequency of heat waves in Poznań over the last 50 years. Across the area of the city (differentiation of urban area types according to Urban Atlas 2012), there was a great diversity of thermal conditions during the heat waves analysed.

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Section: Hot Days and Heat Waves In The Years 1966-2015 (Poznań-ławica)mentioning

confidence: 94%

“…It is hence defined as an extreme weather event. The value of the 95th percentile of the air temperature was often used in previous studies on the occurrence of heat waves [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conditions in the City of Poznań (Poland) during Selected Heat Waves

2018

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“…Furthermore, it must also be borne in mind that globally minimum temperatures (nighttime) have increased more than daytime temperatures [42,61] and a reasonably symmetric warming of minimum and maximum extremes has been detected at a European level [62]. For these reasons, a comprehensive approach to the HW calculation should also take the cooling effect at night into consideration, and not just the maximum temperature or apparent temperature as reported in recent studies [63,64]. The HWHI approach developed in this study is in line with the latest guidelines on HWs and health developed thanks to the joint action of the WMO and the WHO [14].…”

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confidence: 99%

Increasing Heatwave Hazards in the Southeastern European Union Capitals

et al. 2017

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Heatwaves (HWs) are one of the "natural" hazards with the greatest impact worldwide in terms of mortality and economic losses, and their effects may be exacerbated in large urban areas. For these reasons, more detailed analyses of urban HW trends represent a priority that cannot be neglected. In this study, HW trends were investigated during the warmest period of the year (May-September) by using a slightly improved version of the EuroHEAT HW definition applied on long meteorological time-series (36-year period, 1980-2015) collected by weather stations located in the capitals of the 28 European Union member countries. Comparisons between two 18-year sub-periods (1980-1997 vs. 1998-2015) were carried out and a city-specific HW hazard index (HWHI), accounting for the main HW characteristics, was proposed. Most of the capitals revealed significant positive trends of the majority of HW hazard characteristics and substantial HWHI increases were observed during the sub-period 1998-2015, especially in the central-eastern and southeastern cities. Conversely, minor HWHI increases were observed in most of the northern capitals and opposite situations were even observed in several northern and especially southwestern cities. The results of this study represent a support for planning urban HW-related mitigation and adaptation strategies with the priority given to the southeastern cities.

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“…In most of Europe, cold winter and hot summer extremes rank among the largest observed seasonal climate impacts within the annual cycle, requiring large resources to manage the consequences of frost and heat which claim many lives [8,[67][68][69][70][71][72]. With a higher base line of temperature averages, the number, frequency and intensity of high temperature extremes increase globally, while the number, frequency and intensity of low temperature extremes decline [4][5][6].…”

Section: Discussionmentioning

confidence: 99%

Climatic Changes and Their Relation to Weather Types in a Transboundary Mountainous Region in Central Europe

et al. 2018

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A first-time common cross-border assessment of observed climatic changes in the Saxon-Bohemian region was the aim of the German-Czech climate cooperation INTERKLIM. This paper focuses on the observed changes of temperature and precipitation averages and extremes within the period 1961-2010, investigating how variations of a range of climate indices were regionally shaped by changes in frequency and character of weather types. This investigation serves to enhance our understanding of the regional climate characteristics to develop transboundary adaptation strategies and focuses on the classification of the "Grosswetterlagen" using the parameters of air temperature and precipitation. Climate data were quality controlled and homogenized by a wide range of methods using the ProClimDB software with a subsequent comprehensive regional visualization based on Geographical Information Systems. Trends for the temperature averages showed increasing trend values mainly from January to August, especially for high temperature extremes. Precipitation trends displayed regionally varying signals, but a strong spatially uniform decrease from April to June (early growing season) and a distinctive increase from July to September (late growing season). Climatic changes were supported by frequency changes of weather types, e.g., the drying from April to June was related to a decrease/increase in patterns causing rather wet/dry conditions, while from July to September opposite trends were observed. Our results represent regional climatic changes in a complex topography and their dependency on variations in atmospheric circulation peculiarities.

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Circulation Conditions’ Effect on the Occurrence of Heat Waves in Western and Southwestern Europe

Cited by 39 publications

References 41 publications

Thermal Conditions in the City of Poznań (Poland) during Selected Heat Waves

Thermal Conditions in the City of Poznań (Poland) during Selected Heat Waves

Increasing Heatwave Hazards in the Southeastern European Union Capitals

Climatic Changes and Their Relation to Weather Types in a Transboundary Mountainous Region in Central Europe

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