Journal ArticleDOI
Classifications of Atmospheric Circulation Patterns
Radan Huth,Christoph Beck,Andreas Philipp,Matthias Demuzere,Zbigniew Ustrnul,Monika Cahynová,Jan Kyselý,Ole Einar Tveito +7 more
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TLDR
It is mentioned a more extensive use in climate studies, both of past, present, and future climates, innovative applications in the ensemble forecasting, increasing variety of synoptic–climatological investigations, and steps above from the troposphere.Abstract:
We review recent advances in classifications of circulation patterns as a specific research area within synoptic climatology. The review starts with a general description of goals of classification and the historical development in the field. We put circulation classifications into a broader context within climatology and systematize the varied methodologies and approaches. We characterize three basic groups of classifications: subjective (also called manual), mixed (hybrid), and objective (computer-assisted, automated). The roles of cluster analysis and principal component analysis in the classification process are clarified. Several recent methodological developments in circulation classifications are identified and briefly described: the introduction of nonlinear methods, objectivization of subjective catalogs, efforts to optimize classifications, the need for intercomparisons of classifications, and the progress toward an optimum, if possible unified, classification method. Among the recent tendencies in the applications of circulation classifications, we mention a more extensive use in climate studies, both of past, present, and future climates, innovative applications in the ensemble forecasting, increasing variety of synoptic-climatological investigations, and steps above from the troposphere. After introducing the international activity within the field of circulation classifications, the COST733 Action, we briefly describe outputs of the inventory of classifications in Europe, which was carried out within the Action. Approaches to the evaluation of classifications and their mutual comparisons are also reviewed. A considerable part of the review is devoted to three examples of applications of circulation classifications: in historical climatology, in analyses of recent climate variations, and in analyses of outputs from global climate models.read more
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Journal ArticleDOI
A review of clustering techniques and developments
Amit Saxena,Mukesh Prasad,Akshansh Gupta,Neha Bharill,Om Prakash Patel,Aruna Tiwari,Meng Joo Er,Weiping Ding,Chin-Teng Lin +8 more
TL;DR: The applications of clustering in some fields like image segmentation, object and character recognition and data mining are highlighted and the approaches used in these methods are discussed with their respective states of art and applicability.
Journal ArticleDOI
Cost733cat - A database of weather and circulation type classifications
Andreas Philipp,Judit Bartholy,Christoph Beck,Michel Erpicum,Pere Esteban,Xavier Fettweis,Radan Huth,Paul James,Sylvie Jourdain,Frank Kreienkamp,Thomas Krennert,S. Lykoudis,Silas C. Michalides,Krystyna Pianko-Kluczyńska,Piia Post,Domingo Fernando Rasilla Álvarez,Reinhard Schiemann,Arne Spekat,Filippos Tymvios +18 more
TL;DR: It is shown that the types of subjective classifications compared to automated methods show higher persistence, inter-annual variation and long-term trends, while among the automated classifications optimization methods show a tendency for longer persistence and higher seasonal variation.
Journal ArticleDOI
The impact of circulation patterns on regional transport pathways and air quality over Beijing and its surroundings
Jingxu Zhang,Tong Zhu,Qiang Zhang,Chengcai Li,H. L. Shu,Yue Ying,Z. P. Dai,Xiang Wang,Xingang Liu,A. M. Liang,H. X. Shen,Bingqi Yi +11 more
TL;DR: In this paper, the authors investigated the air pollution characteristics of synoptic-scale circulation in the Beijing megacity, and provided quantitative evaluation of the impacts of circulation patterns on air quality during the 2008 Beijing Summer Olympics.
Journal ArticleDOI
Classification of summertime synoptic patterns in Beijing and their associations with boundary layer structure affecting aerosol pollution
Yucong Miao,Jianping Guo,Shuhua Liu,Huan Liu,Zhanqing Li,Zhanqing Li,Wanchun Zhang,Panmao Zhai +7 more
TL;DR: In this paper, the obliquely rotated principal component analysis (PCA) was applied to classify the summertime synoptic conditions over Beijing using the National Centers for Environmental Prediction reanalysis from 2011 to 2014, and investigated their relationships with PBL structure and aerosol pollution by combining numerical simulations, measurements of surface meteorological variables, fine-resolution soundings, the concentration of particles with diameters less than or equal to 2.5 µm, total cloud cover (CLD), and reanalysis data.
Journal ArticleDOI
The self-organizing map in synoptic climatological research:
Scott C. Sheridan,Cameron C. Lee +1 more
TL;DR: Improved visualization has led to SOMs becoming an increasingly popular tool in various research with climatological applications from other disciplines as well, and a larger number of patterns can be more readily understood, and patterns, as well as transitional nodes between patterns, can be discerned.
References
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