Evaluation and comparison of circulation type classifications for the European domain

Beck, Christoph; Philipp, A.

doi:10.1016/j.pce.2010.01.001

Cited by 100 publications

(125 citation statements)

References 33 publications

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“…Interestingly, several extensive classification studies have found that no one single classification technique produces the best classification for all applications (Huth et al 2008;Beck and Philipp 2010;Philipp et al 2014). As such, we used a two-stage clustering technique comprising a hierarchical clustering scheme followed by k-means as this technique has been widely used for atmospheric circulation classification defined by wind fields (e.g.…”

Section: Classification Methodsmentioning

confidence: 99%

Daily near-surface large-scale atmospheric circulation patterns over the wider Caribbean

Chadee

Clarke

2015

Clim Dyn

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Section: Classification Methodsmentioning

confidence: 99%

Daily near-surface large-scale atmospheric circulation patterns over the wider Caribbean

Chadee

Clarke

2015

Clim Dyn

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“…Alternatively, subjective vs. objective procedures or even hybrid methods have been established . For additional information on different CWTs classification procedures and applications throughout Europe please see also Huth et al (2008); Beck and Philipp (2010) and Philipp et al (2010).…”

Section: Circulation Weather Type Classificationmentioning

confidence: 99%

“…CWTs are a fairly simple method to describe atmospheric circulation variability (Huth et al, 2008;Beck and Philipp, 2010), providing a discrete characterization of the atmospheric conditions for a specific given region. These weather patterns or CWTs result from the automated examination of synoptic weather data [e.g., sea level pressure (SLP) or geopotential height at 500 hPa (HGT500)], usually on regular gridded fields (Huth et al, 2008;Beck and Philipp, 2010). Most classification procedures are based on the application of statistical selection rules or on the determination of physical parameters related with the prevailing atmospheric circulation pattern (Yarnal, 1993;Beck and Philipp, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…These weather patterns or CWTs result from the automated examination of synoptic weather data [e.g., sea level pressure (SLP) or geopotential height at 500 hPa (HGT500)], usually on regular gridded fields (Huth et al, 2008;Beck and Philipp, 2010). Most classification procedures are based on the application of statistical selection rules or on the determination of physical parameters related with the prevailing atmospheric circulation pattern (Yarnal, 1993;Beck and Philipp, 2010). CWTs have been widely used and the focus tends to be threesome: (i) climatic variability, including trends and extreme years, (ii) environmental and (iii) weather driven natural hazards.…”

Section: Introductionmentioning

confidence: 99%

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The influence of circulation weather patterns at different spatial scales on drought variability in the Iberian Peninsula

Russo

Gouveia

Trigo

et al. 2015

Front. Environ. Sci.

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Europe has suffered several extreme weather events which were responsible for considerable ecological and economic losses in the last few decades. In Southern Europe, droughts are one of the most frequent extreme weather events, causing severe damages and various fatalities. The main goal of this study is to determine the role of Circulation Weather Types (CWT) on spatial and temporal variability of droughts by means of the multi-scalar Standardized Precipitation Evapotranspiration Index (SPEI). This study aims also to identify the main CWTs associated with winter and summer droughts over different regions of Iberian Peninsula. During the period between 1950 and 2012, the most frequent CWTs were found to be the Anticyclonic (A), Cyclonic (C), North (N) and Northeast (NE) types. The trend analysis for winter season shows a clear increase of frequency CWTs associated to dry events (A, East and Southeast) and a decrease of frequency of C and northern types while in summer a clear decrease of NE is observed. The spatial patterns of correlation between SPEI and CWT show large patterns of negative correlations with winter frequencies of A and eastern weather types, while the reverse occurs with C and western types. This feature is highlighted on a regional approach. The NE type presents negative correlations in Central, Northwestern and Southwestern regions during winter and positive correlations in Eastern region during summer. In opposition, the West type presents positive correlations in all regions (except Eastern region) during winter and does not present significant correlations during summer. In general, the predominant CWT associated to winter or summer drought conditions differs greatly between regions. The winter droughts are associated mainly with high frequency of E types and low frequency of W types for all areas, while the summer drought in eastern sectors are linked with low frequency of C type, as well as the western regions are related with the N type.

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“…The ability of the SANDRA algorithm to classify circulation patterns for meteorological and climatological studies has been shown before for different parts of the world (Philipp et al, 2007;Huth et al, 2008;Beck and Philipp, 2010;Casado et al, 2010;Souverijns et al, 2016). Next to the choice of the classification algorithm, it is also necessary to define the total number of circulation patterns that covers the full climatology over Dronning Maud Land.…”

mentioning

confidence: 99%

How does the ice sheet surface mass balance relate to snowfall? Insights from a ground-based precipitation radar in East Antarctica

Souverijns¹,

Gossart²,

Gorodetskaya³

et al. 2017

Preprint

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Abstract. Local surface mass balance (SMB) measurements are crucial for understanding changes in the total mass of the Antarctic Ice Sheet, including its contribution to sea level rise. Despite continuous attempts to decipher mechanisms controlling the local SMB, a clear understanding of the separate components is still lacking, while snowfall measurements are almost absent. In this study, the different terms are quantified at the Princess Elisabeth (PE) station in Dronning Maud Land, East Antarctica. Furthermore, the relation between snowfall and accumulation at the surface is investigated. To achieve this, a 5 unique collocated set of remote sensing instrumentation (Micro Rain Radar, ceilometer, Automatic Weather Station, among others) was established operating for an unprecedented time period of 37 months. Snowfall originates mainly from moist and warm air advected from lower latitudes associated with cyclone activity. However, snowfall events are much more common than accumulation events. During 38 % of the snowfall cases observed, the freshly-fallen snow is ablated by the wind during the course of the event. Generally, snow storms of longer duration have a higher chance to attain for accumulation at the local scale, 10 while shorter events usually attain for ablation (on average 17 and 12 hours respectively). As such, SMB records cannot be considered a good proxy for snowfall at the local scale. Accumulation and ablation also occur during non-snowfall conditions. A large part of the accumulation at the station takes place when preceding snowfall events were occurring in upstream coastal areas. This fresh snow is easily picked up and transported in shallow drifting snow layers to more inland locations, even when wind speed is relatively low (< 7 ms −1 ). Ablation events are mainly related to katabatic winds originating from the Antarctic 15 plateau and the mountain ranges in the south. These dry winds are able to remove snow and lead to a decrease in the local SMB. This work highlights that, even though observations are local, the SMB is strongly influenced by synoptic upstream conditions.

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Evaluation and comparison of circulation type classifications for the European domain

Cited by 100 publications

References 33 publications

Daily near-surface large-scale atmospheric circulation patterns over the wider Caribbean

Daily near-surface large-scale atmospheric circulation patterns over the wider Caribbean

The influence of circulation weather patterns at different spatial scales on drought variability in the Iberian Peninsula

How does the ice sheet surface mass balance relate to snowfall? Insights from a ground-based precipitation radar in East Antarctica

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