Impact of macro-scale circulation types on the occurrence of frosty days in Poland

Tomczyk, Arkadiusz M.

doi:10.1515/bgeo-2015-0016

Cited by 13 publications

(12 citation statements)

References 17 publications

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“…Numerous studies have shown that the increase in air temperature in winter observed over the recent decades has caused a decrease in the frequency of frosty days and cold spells (Tomczyk 2015;Lhotka and Kyselý 2015;Owczarek and Filipiak 2016). Considerably less attention has been paid to the winter occurrence of exceptionally warm periods, the effects of which concern both the natural environment and human life and economyparticularly the agricultural sector (Menzel et al 2011).…”

Section: Discussion and Summarymentioning

confidence: 99%

Atmospheric circulation conditions during winter warm spells in Central Europe

et al. 2019

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The objective of the paper was to characterise the temporal and spatial variability of winter warm spells in Central Europe in the years 1966/1967-2015/2016 and to determine the circulation conditions of their occurrence. The applied data were obtained from the Polish Institute of Meteorology and Water Management, Deutscher Wetterdienst and the National Centre for Environmental Prediction/National Centre for Atmospheric Research. A warm spell was defined as a sequence of at least three warm days, i.e. when the maximum air temperature is higher than the 95th percentile of the probability density function designated from observation. The research has proven that over the study period the air temperature increased in the winter season in Central Europe and this translated into an increase in the number of warm days. An average of 3-5 warm spells was recorded per 10 years. The most numerous warm spells occurred during three winter seasons, i.e. 1989/1990, 2006/2007 and 2015/2016. The occurrence of warm spells was related to positive anomalies of geopotential heights over the study area in the cross section of the entire troposphere. Maximum anomalies appeared at 250 hPa geopotential height, and they developed on average 9 days before the commencement of warm spells over the study area.

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Section: Discussion and Summarymentioning

confidence: 99%

Atmospheric circulation conditions during winter warm spells in Central Europe

et al. 2019

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“…The impact of the North Atlantic Oscillation (NAO) on air temperature and atmospheric precipitation has been described in detail [8,28,40,[56][57][58], as a macroscopic pattern of atmospheric circulation that determines climatic conditions [59]. Regarding Poland, research into the NAO focuses on, for example, the occurrence of frosty days [60], snow cover [61,62], seasonal river run-off [63], and also water levels, thermal characteristics, and ice phenomena on lakes [64,65]. The influence of NAO variability on hydrological phenomena, including on the hydrological regime, changes in flow rate, and the thermal and ice regime of rivers and lakes, has been described, among others, by Yoo and D'Odorico [29] and Klavins et al [33].…”

Section: Introductionmentioning

confidence: 99%

Relationship between Water Temperature of Polish Rivers and Large-Scale Atmospheric Circulation

Graf

Wrzesiński

2019

Water

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The objective of the paper consisted in determining the effect of macroscale types of NAO, AO, EA, EAWR, SCAND, and AMO atmospheric circulation on changes in water temperature in Polish rivers. The study has made use of a broad body of hydrometeorological materials covering daily water temperature values for 96 water gauge stations located on 53 rivers and air temperature values for 43 meteorological stations. Percentage shares of positive and negative coefficients of correlation of annual, seasonal, and monthly circulation type indices with air and river water temperature were determined, demonstrating the character of teleconnection. Determinations were made of water temperature deviations in positive and negative phases of the analyzed indices from average values from the years 1971–2015, and their statistical significance ascertained. Research has shown that relations between the temperature of river waters in Poland and macroscale circulation types are not strong, however they are noticeable, sometimes even statistically significant, and both temporally and spatially diverse. NAO, AO, EA, and AMO indices are characterized by a generally positive correlation with temperature, whereas SCAND and EWAR indices are characterized by a negative correlation. Research showed a varying impact of types of atmospheric circulation, with their effectiveness increasing in the winter season. The strongest impact on temperature was observed for the positive and negative NAO and AO phases, when deviations of water temperature from average values are correspondingly higher (up to 1.0 °C) and lower (by a maximum of 1.5 °C), and also for the positive and negative SCAND phases, when water temperature are correspondingly lower (by a maximum of 0.8 °C) and higher (by 1.2 °C) than average values. The strongest impact on water temperature in summer, mainly in July, was observed for AMO. The results point to the complexity of processes determining the thermal regime of rivers and to the possibility of additional factors—both regional and local—exerting an influence on their temporal and spatial variability.

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“…Changes in its intensity affect, among other things, the course of precipitation and air temperature [9,10]. Whereas in the case of NAO the relationships are relatively thoroughly investigated, in the case of other circulation patterns, such an approach still requires more detailed research [11,12]. In addition to the aforementioned circulation type, climatic conditions in Europe (with variable intensity) are affected by other circulation patterns, including the Arctic Oscillation (AO), East Atlantic pattern (EA), East Atlantic/Western Russia (EAWR), and the Scandinavian pattern (SCAND).…”

Section: Introductionmentioning

confidence: 99%

Effect of Teleconnection Patterns on Changes in Water Temperature in Polish Lakes

2018

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Abstract:The objective of the paper was the determination of the effect of teleconnection patterns (North Atlantic Oscillation (NAO), Arctic Oscillation (AO), East Atlantic pattern (EA), East Atlantic/Western Russia (EAWR), and Scandinavian pattern (SCAND)) on changes in air and water temperature in Polish lakes. Correlations of circulation indices with air and lake water temperature were analysed in the monthly cycle. Deviations of values of such components in different phases of the analysed atmospheric circulations types from mean average from the years 1971 to 2015 were also determined. The research showed a variable effect of the atmospheric circulations types. The strongest effect on water temperature was observed in winter, when AO and NAO circulation showed particularly evident influence. Deviations of water temperature from mean values from the analysed multi-annual period generally oscillated around 1.0 • C, reaching a maximum value of 1.4 • C. The presented research shows the complexity of processes determining changes in lake water temperature, the course of which depends on many factors with both regional (e.g., ice cover on lakes) and local range (conditions of water exchange, human pressure).

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Impact of macro-scale circulation types on the occurrence of frosty days in Poland

Cited by 13 publications

References 17 publications

Atmospheric circulation conditions during winter warm spells in Central Europe

Atmospheric circulation conditions during winter warm spells in Central Europe

Relationship between Water Temperature of Polish Rivers and Large-Scale Atmospheric Circulation

Effect of Teleconnection Patterns on Changes in Water Temperature in Polish Lakes

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