Large-scale circulation classification, weather regimes, and local climate over France, the Alps and Western Europe

Plaut, G.; Simonnet, Eric

doi:10.3354/cr017303

Cited by 104 publications

(118 citation statements)

References 16 publications

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“…In most cases, a best value of k clearly appears: when classifying the 18 060 extended winter (November-March) daily SLP patterns for the period between November 1881 and March 2000, the rednoise test unambiguously selects k = 5 WRs. We briefly describe in the next section how they associate with surface characteristics of temperature and precipitation (see Plaut and Simonnet (2001) for further details).…”

Section: The Dynamical Cluster Algorithmmentioning

confidence: 99%

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The impact of El Niño–southern oscillation upon weather regimes over Europe and the North Atlantic during boreal winter

Moron

Plaut

2003

Intl Journal of Climatology

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The influence of the warm and cold sea-surface temperatures in the eastern and central equatorial Pacific associated with El Niño-southern oscillation (ENSO) on the probability of occurrence of weather regimes (WRs) over the North Atlantic sector is investigated for the period November-March. Five WRs are identified from daily sea-level pressure anomalies (SLPAs) during 119 winters over this sector by applying cluster analysis: the positive North Atlantic oscillation (NAO; called ZO for zonal) and negative NAO (called WBL for west blocking) patterns; GA (for Greenland anticyclone), with a positive SLPA shifted north of 60°N; EA (for European anticyclone) with a positive SLPA over Europe but enhanced north-south SLPA gradient over the western and central North Atlantic; and AR (for Atlantic Ridge) with a positive (negative) SLPA over the central North Atlantic (northern and central Europe).El Niño winters are associated with a significant increase (decrease) in the prevalence of ZO (WBL) in November-December and a significant increase (decrease) in the prevalence of GA and WBL (EA and ZO)

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Section: The Dynamical Cluster Algorithmmentioning

confidence: 99%

“…Like Plaut and Simonnet (2001), we address these problems by the methodology defined by Michelangeli et al (1995); see also Cheng and Wallace (1993). The method is based on the use of a red-noise test, which we briefly state below.…”

Section: The Dynamical Cluster Algorithmmentioning

confidence: 99%

The impact of El Niño–southern oscillation upon weather regimes over Europe and the North Atlantic during boreal winter

Moron

Plaut

2003

Intl Journal of Climatology

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“…Many other works have been proposed, showing different approximations on daily circulation pattern classification via PCA and CL techniques (Plaut and Simonnet, 2001;Skinner et al, 2002;Solman and Menéndez, 2003;Rasilla, 2003;Müller et al, 2003). This extensive bibliography shows the robustness of the method for daily circulation pattern classifications, but does not yet clarify what the best options to be chosen are, leaving this decision to the researcher.…”

Section: Introductionmentioning

confidence: 99%

Daily atmospheric circulation catalogue for western Europe using multivariate techniques

Esteban

Martín‐Vide

Mases³

2006

Intl Journal of Climatology

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This study uses principal component analysis (PCA) and clustering (CL) techniques to characterize the daily surface synoptic circulation patterns over the region 30°N-60°N by 30°W-15°E, for the period 1960-2001 using the NCEP/NCAR Reanalysis Project data. The methodology used, previously proposed by Esteban et al. (2005) to identify heavy snowfall days over Andorra (Pyrenees), involves a pre-processing approach consisting of a spatial standardization of the data used for the rotated PCA on S-mode analysis and correlation matrix, and Varimax rotation of the retained components. For the clustering process, an alternative approximation based on the PCA results (positive and negative phases) to decide the centroids and the number of groups for the K-means clustering is shown, followed by the rejection of the iterations for this non-hierarchical algorithm. Twenty sea level pressure (SLP) circulation patterns were obtained, with all days classified. The composite maps for SLP and 500 hPa geopotential height (GPH), the monthly distribution, and the long-term variability for each of the circulation patterns is obtained. The results are consistent with the subjective knowledge of the daily atmospheric circulation over the area treated, and seem to be an easy and accessible way for the synoptic studies of short-lived (from weekly to daily) phenomena. In addition, this methodology appears to be applicable to all climatic areas of the world, as it characterizes well enough the complex circulation variability at mid-latitudes, including the surface low-pressure gradient patterns normally located over the Mediterranean in summer.

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“…For instance, weather regimes excitation can be favoured by tropical sea-surface temperature anomalies [Cassou et al, 2005], dry soils [Fischer et al, 2007] or Mediterranean seasurface temperature anomalies [Feudale and Shukla, 2007] in summer, which can play an important role in the development and maintenance of heat waves. Whatever the origin, the mean seasonal temperature over Europe largely depends on the frequency the weather regimes during the corresponding season [Palmer, 1999;Plaut and Simonnet, 2001]. Exceptionally high frequency of a mild regime may lead to exceptionally warm average temperature.…”

Section: Introductionmentioning

confidence: 99%

Inconsistency between atmospheric dynamics and temperatures during the exceptional 2006/2007 fall/winter and recent warming in Europe

Yiou¹,

Vautard²,

Naveau³

et al. 2007

Geophysical Research Letters

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Large-scale circulation classification, weather regimes, and local climate over France, the Alps and Western Europe

Cited by 104 publications

References 16 publications

The impact of El Niño–southern oscillation upon weather regimes over Europe and the North Atlantic during boreal winter

The impact of El Niño–southern oscillation upon weather regimes over Europe and the North Atlantic during boreal winter

Daily atmospheric circulation catalogue for western Europe using multivariate techniques

Inconsistency between atmospheric dynamics and temperatures during the exceptional 2006/2007 fall/winter and recent warming in Europe

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