Atmospheric Circulation Patterns Associated with Heavy Snowfall Events, Bridger Bowl, Montana, U.S.A.

Birkeland, Karl W.

doi:10.2307/3673951

Cited by 41 publications

(41 citation statements)

References 12 publications

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“…At the same time, the lower-than-normal SLP is observed north-west of the studied area-above −6 hPa over the Fram Strait. The interpretation of the contoured composite anomalies is similar to the traditional weather anomaly maps, with clockwise (anticyclonic) flow around the positive centres and counter clockwise (cyclonic) flow around the negative centres (Birkeland and Mock 1996). Consequently, the circulation during the extremely cloudy days in winter is characterized by a strong southerly and south-westerly flow component, in contrast to the average winter circulation over the North Atlantic.…”

Section: Atmospheric Circulation Versus Anomalies Of Cloudinessmentioning

confidence: 63%

Atmospheric conditions governing anomalies of the summer and winter cloudiness in Spitsbergen

Bednorz

Kaczmarek

Dudlik

2014

Theor Appl Climatol

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The study is based on data concerning cloudiness for the years 1981-2010 from Svalbard Lufthavn. Atmospheric circulation was characterized using a catalogue of circulation types developed by Niedźwiedź (2013) and average daily values of atmospheric pressure. Intensive cyclogenesis taking place over the north Atlantic expressed by lower-than-normal sea level pressure (SLP), particularly over the Fram Strait and over the east coast of Greenland, enhances the meridional air transport from the southern sector which conveys positive anomalies of cloudiness, namely a very cloudy weather. Negative anomalies of cloudiness over Svalbard Lufthavn occur in the winter when the north Atlantic cyclone path is shifted to the south and goes along the northern Norwegian shore towards the south Barents Sea. In summer, the influence of pressure patterns on cloudiness is weaker than in winter and different circulation patterns induce negative extremes of cloudiness. In the warm season, sunny weather occurs when a distinct anticyclone spreads over the Svalbard Archipelago and to its west, over the Fram Strait and the northern outskirts of the Greenland Sea. Extremely cloudy weather occurs in summer when a weak anticyclone spreads over the Barents Sea, the Novaya Zemlya archipelago and the Kara Sea, while slightly lower-than-normal pressure is observed over Greenland. Such a pressure pattern enhances southerly and south-westerly flow of air masses, bringing humid air. The results obtained in this study demonstrate that cloudiness over Spitsbergen is strongly controlled by the air circulation arising from pressure patterns.

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Section: Atmospheric Circulation Versus Anomalies Of Cloudinessmentioning

confidence: 63%

Atmospheric conditions governing anomalies of the summer and winter cloudiness in Spitsbergen

Bednorz

Kaczmarek

Dudlik

2014

Theor Appl Climatol

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“…This is a hierarchical clustering technique, most frequently used for climatic classification (Kalkstein et al 1987) for identifying the atmospheric circulation patterns associated with occurrence of specific weather phenomena (e. g. Birkeland, Mock 1996;Bednorz 2008;Bednorz 2011;Suwała 2013). In the case of this study the clustered objects were the days consisting to the heat/cold waves and the clustering was based on the daily standardized SLP data.…”

Section: Methodsmentioning

confidence: 99%

Heat and cold waves on the southern coast of the Baltic Sea

Tomczyk

Bednorz

2014

Baltica

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The objective of this study was to describe the characteristics of heat and cold waves on the southern coast of the Baltic Sea, and determine synoptic situations causing the occurrence of the waves. The analysis concerned six stations located on the southern coast of the Baltic Sea. In the study, an extreme warm day was defined as a day with the maximum temperature over the 95 th annual percentile, while an extreme cold day as a day with the maximum temperature below the 5 th annual percentile. A sequence of at least five extreme warm and cold days was considered, i. e. heat or cold waves, respectively. In the analysed multiannual period, on the southern coast of the Baltic Sea, there were from 11 (Świnoujście) to 28 (Arkona) heat waves recorded, while the number of cold waves was from 34 (Świnoujście) to 43 (Kołobrzeg). The occurrence of extreme warm and cold days creating heat and cold days was connected with positive anomalies of sea level pressure and isobaric surface 500 hPa, which showed the presence of the high pressure systems.

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“…Many methods have been used, and different variables investigated such as heavy snowfalls (Birkeland and Mock, 1996). One of the first papers using PCA and CL in this way corresponds to Richman (1981), relating circulation patterns to precipitation events.…”

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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Atmospheric Circulation Patterns Associated with Heavy Snowfall Events, Bridger Bowl, Montana, U.S.A.

Cited by 41 publications

References 12 publications

Atmospheric conditions governing anomalies of the summer and winter cloudiness in Spitsbergen

Atmospheric conditions governing anomalies of the summer and winter cloudiness in Spitsbergen

Heat and cold waves on the southern coast of the Baltic Sea

Daily atmospheric circulation catalogue for western Europe using multivariate techniques

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