Vliv atmosférické cirkulace na přízemní klimatické prvky v Evropě

0354096 - ÚFA 2011 CZ cze D - Dizertace
Pokorná, Lucie
Vliv atmosférické cirkulace na přízemní klimatické prvky v Evropě.
[The relationships between atmospheric circulation and surface climatic elements in Europe.]
Matematicko-fyzikální fakulta Univerzity Karlovy. 04.11.2010. - Praha: MFF KU, 2010. 90 s.
Výzkumný záměr: CEZ:AV0Z30420517
Klíčová slova: Circulation modes * principal component analysis * NAO index * climatic elements * Europe
Kód oboru RIV: DG - Vědy o atmosféře, meteorologie

Práce se věnuje vztahům mezi atmosférickou cirkulací a teplotami, výskytem a úhrny srážek na Evropských stanicích a dalšími prvky ve střední Evropě. Pro popis cirkulace v průběhu roku byly zvoleny nízkofrekvenční módy proměnlivosti v hladině geopotenciálních výšek 500 hPa a v poli přízemního tlaku získané statistickou metodou „Analýza hlavních komponent”. Vztahy mezi módy a klimatickými prvky jsou kvantifikovány pomocí Pearsonova korelačního koeficientu.

The relationships between climatic elements like the temperature and the precipitation over the Europe region and atmospheric circulation represented by modes of low-frequency circulation variability in sea level pressure (SLP) and 500-hPa heights (Z500) are described using the Person correlation coefficient. More detailed analysis is achieved for central Europe.Four circulation patterns in Z500 and SLP over the Euro-Atlantic sector that influence climate in Europe all over the year were obtained by using Principal component analysis: the North Atlantic Oscillation (NAO) pattern, the East Atlantic pattern, and two Eurasian patterns. Statistically significant correlations of modes in both levels with maximum, minimum and mean temperature and with precipitation amounts and occurrence at European stations were identified in all seasons. In addition, several modes have strong influence on duration of sunshine, relative humidity, cloud cover, wind speed and direction at stations in Czech Republic. The other part of this work studies the sensitivity of the effects of NAO on surface climate to the way how the NAO is defined. Six different NAO index definitions including scores of modes from PCA were compared. The correlations with precipitation and surface temperature were used to illustrate the influence of individual NAO indices. Although all NAO indices mutually strongly correlate and seem to represent atmospheric circulation similar way, this is true only in winter.
Trvalý link: http://hdl.handle.net/11104/0193174