RT info:eu-repo/semantics/article T1 Boundaries of air mass trajectory clustering: key points and applications A1 Pérez Bartolomé, Isidro Alberto A1 Sánchez Gómez, María Luisa A1 García Pérez, María Ángeles A1 Pardo Gómez, Nuria AB Calculating air mass trajectories is common in atmospheric analyses. However, if explainable results are to be achieved, several procedures are needed to process the vast amount of information handled. Clustering methods are statistical tools usually considered for such a purpose. Although they are based on rigorous algorithms, certain questions still remain when these methods are applied. The current review is organised in sections according to the sequence followed by such procedures. First, the types of clustering methods are described, with their core being the distance used. One key point is the stopping rule, which determines the final number of clusters. A simple classification based on this number is then suggested. Finally, the graphical presentation of the results is examined and the main drawbacks are commented on. A range of applications and results are considered to illustrate each section, and certain caveats and recommendations are also presented. PB SPRINGER SN 1735-1472 YR 2017 FD 2017 LK http://uvadoc.uva.es/handle/10324/32889 UL http://uvadoc.uva.es/handle/10324/32889 LA eng NO Int. J. Environ. Sci. Technol. 14 2017 653–662 DS UVaDOC RD 24-nov-2024