NAO impact on the summer moisture variability across Europe

Mares, Ileana; Mares, Constantin; Mihailescu, Mihaela

doi:10.1016/s1474-7065(02)00135-3

Cited by 34 publications

(22 citation statements)

References 6 publications

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“…I). Such weather conditions normally develop during years with enhanced anticyclonicity in the Arctic circulation system, when blocking anticyclones define the weather patterns over Northern Europe (Mares et al, 2002). Association of negative pointers with such periods was reported previously on the pan-European scale (Kelly et al, 2002).…”

Section: Regional Pointer Yearssupporting

confidence: 53%

“…Dendroclimatic studies have demonstrated the complexities associated with the growth response of pedunculate oak to climate. Summer drought reportedly has a negative effect on oak growth in Britain (Bridge and Winchester, 2000; patterns (Kelly et al, 2002;Mares et al, 2002). Positive growth anomalies were associated with extended periods of increased soil-water availability, resulting from an easterly migration of the Icelandic Low, while negative anomalies were related to periods of lower air temperatures and reduced soil moisture, due to enhanced anticyclonic activity across Europe in those years.…”

Section: Introductionmentioning

confidence: 99%

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Influence de la variabilité interannuelle de climat sur la croissance du chêne pédonculé dans le Sud de la Suède

et al. 2008

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-• A network of oak (Quercus robur L.) chronologies containing 49 sites and 635 single trees was analysed to identify weather variables affecting annual tree-ring increment dynamics in southern Sweden during 1860-2000.• We analysed (1) the growth response of oak to non-extreme weather, and (2) the temporal and spatial patterns of regional growth anomalies (pointer years) and associated climatic extremes resolved on a monthly scale.• Growth was controlled by precipitation in the current (June-July) and the previous growing season (August) in 48% and 22% of all sites, respectively. Temperature during July of the current year and August of the previous year was negatively correlated with growth in 29% and 43% of the sites, respectively. Growth was positively correlated with temperature in October of the previous season in 72% of the sites. The most extensive growth anomaly occurred in 1965 and was probably caused by intrusion of cold Arctic air masses into the region at the end of March that year.• During climatically non-extreme years, oak growth is driven mostly by the dynamics of summer precipitation. Many of the negative growth anomalies, however, were associated with temperature extremes. Southern Swedish oak pointer years tend not to coincide with the pan-European oak pointer years.climatic variability / dendroecology / extreme events / hardwood / Scandinavia Résumé -Influence de la variabilité interannuelle de climat sur la croissance du chêne pédonculé dans le Sud de la Suède.• Une série de chronologies de chênes (Quercus robur L.) comprenant 49 stations et 635 arbres individuels a été analysée pour identifier les variables climatiques affectant la dynamique de croissance annuelle des cernes dans le Sud de la Suède, pendant la période 1860-2000.• Nous avons analysé (1) la réponse de croissance des chênes aux évènements météorologiques non extrêmes et (2) les patrons temporels et spatiaux des anomalies régionales de croissance (années indices) et les extrêmes climatiques associés au pas de temps mensuel.• La croissance était contrôlée par les précipitations de la saison de végétation (juin-juillet) et les précipitations de la saison de végétation précédente (août), respectivement dans 48 % et 22 % de toutes les stations. Les températures du mois de juillet de la saison de végétation et du mois d'août de l'année précédente étaient corrélées négativement avec la croissance, respectivement dans 29 % et 43 % des stations. La croissance était corrélée positivement avec la température du mois d'octobre de l'année précédente dans 72 % des stations. L'anomalie de croissance la plus considérable est arrivée en 1965 et a été causée probablement par l'intrusion de masses d'air froid arctique dans la région, à la fin du mois de mars.• Pendant les années climatiquement non-extrêmes, la croissance du chêne est principalement commandée par la dynamique des précipitations estivales. Cependant, beaucoup d'anomalies négatives de croissance ont été associées avec des extrêmes de température. Les années indices du Sud ...

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Section: Regional Pointer Yearssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Influence de la variabilité interannuelle de climat sur la croissance du chêne pédonculé dans le Sud de la Suède

et al. 2008

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“…Taking into account some atmospheric indices for estimating extreme events in the lower Danube has led to results which indicated a link not too strong between atmospheric indices and climate events. Such, the signal of North Atlantic Oscillation (NAO) index (Mares et al, ) is relatively weak in climate events in the Danube lower basin, although statistically significant. Also, it was demonstrated in Mares et al (, ), that the NAO influence is relatively small on the winter drought in Romania, in comparison with the Greenland‐Balkan Oscillation (GBO) influence.…”

Section: Introductionmentioning

confidence: 99%

Identification of extreme events using drought indices and their impact on the Danube lower basin discharge

Mares

Mihailescu

2016

Hydrological Processes

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In this study extreme droughts and extremely wet periods in the Danube upper and middle basin (DUMB) have been highlighted with specific indices. The most widely used indices have been considered to estimate both the dry and wet phenomena severity and the frequency or spatio‐temporal extension. The climatic condition of 15 meteorological stations situated in the Danube basin has been evaluated using four indices: Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), Weighted PDSI (WPLM) and Palmer Z‐index (ZIND). The four indices have been analysed separately for each of the four seasons between 1901 and 2000. First the internal structure of the time series of the four indices has been analysed separately. Then the overall temporal characteristic has been analysed by means of the principal component of the Multivariate Empirical Orthogonal Functions decomposition of the four indices (PC1‐MEOF). For the discharge in the Danube lower basin, station Orsova has been chosen, representing an integrator of the discharges from the DUMB. A very close connection has been found between Palmer indices and Danube discharge in all seasons (with correlation coefficients greater then 0.80) excepting the spring season. A classification in five classes of both the four indices separately and the PC1‐MEOF has been achieved in order to highlight extreme events. The impact of phenomena quantified by Palmer indices in DUMB upon discharges in Danube lower basin is evident. It was demonstrated in this study that the Greenland‐Balkan Oscillation (GBO) influences the south‐east European hydro‐climatic regime more than the North Atlantic Oscillation (NAO) Index. Copyright © 2016 John Wiley & Sons, Ltd.

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“…These patterns also prove to be stable when different filtering procedures were applied. Owing to the proximity of NAO and its documented effects on winter climate (mainly precipitations) over northwestern Romania (Mares et al, 2002;Tomozeiu et al, 2002) it was just natural to search for a possible linkage between its variability and climate variability over the Scarisoara Cave region. The NAO is considered a mode of internal climate variability throughout the extratropical Northern Hemisphere that influences atmospheric circulation, temperature and precipitation over a wide region (Hurrell, 1995).…”

Section: Discussionmentioning

confidence: 99%

Large‐scale anomaly patterns associated to temperature variability inside Scarisoara Ice Cave

Rîmbu

Onac

Racovita

2011

Intl Journal of Climatology

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ABSTRACT:The relationship between temperature variability inside Scarisoara Ice Cave (NW Romania) and large-scale atmospheric circulation and sea surface temperature (SST) anomalies is investigated. A composite analysis reveals that high (low) temperatures inside the cave are associated with high (low) air temperature over a large area that covers central and Eastern Europe. Coherent large-scale patterns are identified in the field of SST anomalies. The corresponding atmospheric circulation patterns favour relatively warm (cold) air advection towards the cave region during high (low) temperatures inside the cave. A correlation analysis reveals that the atmospheric circulation patterns associated with cave temperature variability is mainly the result of the East Atlantic-Western Russia (r = −0.38) teleconnection pattern. Our results have strong implications for the interpretation of climate variability in the region as recorded by the ice block within the Scarisoara Ice Cave, which is more than 3000 years old.

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NAO impact on the summer moisture variability across Europe

Cited by 34 publications

References 6 publications

Influence de la variabilité interannuelle de climat sur la croissance du chêne pédonculé dans le Sud de la Suède

Influence de la variabilité interannuelle de climat sur la croissance du chêne pédonculé dans le Sud de la Suède

Identification of extreme events using drought indices and their impact on the Danube lower basin discharge

Large‐scale anomaly patterns associated to temperature variability inside Scarisoara Ice Cave

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