Résultat de la recherche
Enquête suisse sur la structure des salaires : révision de la pondération, adaptation du plan et perspectives
La pondération de l'enquête suisse sur la structure des salaires 2018 est révisée. L'objectif principal de cette révision est d'utiliser l'information sur les revenus des salariés, mise à disposition de l'Office fédéral de la statistique par les caisses de compensation. Cette information avait déjà été utilisée pour réviser le plan de sondage de l'enquête et doit permettre de réaliser des gains de précision. Ce travail a également été l'occasion de revoir toutes les étapes de la préparation des données et de la pondération.
Properties and comparison of some Kriging sub-model aggregation methods
Design of computer experiments using competing distances between set-value inputs
Clustering of Regional-scale Extreme Precipitation Events in Southern Switzerland
Temporal clustering of extreme precipitation events on sub-seasonal time-scales is of crucial importance for the formation of large-scale flood events. Here, the temporal clustering of regional-scale extreme precipitation events in southern Switzerland is studied. These precipitation events are relevant for the flooding of lakes in southern Switzerland and northern Italy. This research determines whether temporal clustering is present and then identifies the dynamics that are responsible for the clustering. An observation-based gridded precipitation data set of Swiss daily rainfall sums and ECMWF reanalysis data sets are used. We use a modified version of Ripley’s K-function, which determines the average number of extreme events in a time period, to characterize temporal clustering on sub-seasonal time-scales and to determine the statistical significance of the clustering. Significant clustering of regional-scale precipitation extremes is found on sub-seasonal time-scales during the fall season. Four high-impact clustering episodes are then selected and the dynamics responsible for the clustering are examined. During the four clustering episodes, all heavy precipitation events were associated with an upper-level breaking Rossby wave over Western Europe and in most cases strong diabatic processes upstream over the Atlantic played a role in the amplification of these breaking waves. Atmospheric blocking downstream over Eastern Europe supported this wave breaking during two of the clustering episodes. During one of the clustering periods, several extratropical transitions of tropical cyclones in the Atlantic contributed to the formation of high-amplitude ridges over the Atlantic basin and downstream wave breaking. During another event, blocking over Alaska assisted the phase locking of the Rossby waves downstream over the Atlantic.