Atmospheric circulation conditions during winter warm spells in Central Europe

doi:10.1007/s11069-019-03621-4

Atmospheric circulation conditions during winter warm spells in Central Europe

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Atmospheric circulation conditions during winter warm spells in Central Europe

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Bibliographic description

punktacja MNiSW [2019]: 70

title:	Atmospheric circulation conditions during winter warm spells in Central Europe
author:	Tomczyk Arkadiusz M., Sulikowska Agnieszka , Bednorz Ewa, Półrolniczak Marek
journal title:	Natural Hazards
volume:	96
issue:	3
date of publication :	2019
pages:	1413-1428
ISSN:	0921-030X
eISSN:	1573-0840
DOI:	10.1007/s11069-019-03621-4
URL:	https://link.springer.com/article/10.1007/s11069-019-03621-4
date accessed:	2019-08-21
notes:	Bibliogr. s. 1427-1428
language:	English
journal language:	English
abstract in English:	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.
keywords in English:	winter warm spells, circulation conditions, geopotential anomalies, Central Europe
affiliation:	Wydział Geografii i Geologii : Instytut Geografii i Gospodarki Przestrzennej
type:	journal article
subtype:	academic paper