TY - JOUR
TI - Impact of atmospheric circulation on air temperature in Warsaw during months with extreme values of the NAO index (1951–2015)
AU - Kossowska-Cezak, Urszula
AU - Twardosz, Robert
TI - Impact of atmospheric circulation on air temperature in Warsaw during months with extreme values of the NAO index (1951–2015)
AB - 
	In winter, western air masses arriving in Europe, including Poland, change the weather for relatively warmer, while an eastern advection tends to bring freezing temperatures. While the NAO provides a quantitative measure of this western advection, its relationship with air temperature is not always clear-cut. For this reason, this study characterises the circulation and thermal conditions over Poland depending on the sign and the value of the NAO index (NAO+, NAO–).
	The study is based on NAO values and winter (December – March) monthly temperature records in Warsaw spanning 65 years (1951–2015), as well as on the calendar of circulation types proposed by Lityński. A detailed analysis was performed looking at the top 10 months with the highest NAO+ and NAO–, as well as the top 10 months with the greatest positive and negative deviations from the long-term average air temperature (Dt). This selection was based on a premise that the months should largely coincide. The results, however, show certain deviations from previously established patterns in the influence of the NAO+/NAO– on air temperature in Poland.
VL - 2018
IS - Issue 153
PY - 2018
SN - 1644-3586
C1 - 2083-3113
SP - 69
EP - 87
DO - 10.4467/20833113PG.18.004.8479
UR - https://ejournals.eu/en/journal/prace-geograficzne/article/uwarunkowania-cyrkulacyjne-temperatury-powietrza-w-warszawie-w-miesiacach-o-skrajnych-wartosciach-wskaznika-nao-1951-2015
KW - Atmospheric circulation
KW - NAO
KW - air temperature
KW - Warsaw