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- W4321502009 abstract "Persistent unusual configurations of the North Atlantic jet stream affect the weather and climate over Europe. We focus on winter and on intraseasonal and seasonal time scales, and study persistent jet anomalies through the lens of large deviation theory using CMIP6 simulations of the MPI-ESM-LR model and ERA5 reanalysis data. Our results show that persistent temperature and precipitation extremes over large European regions are anomalously frequent during the unusual, persistent jet configurations we identify. Furthermore, the relative increase in frequency of surface extremes is larger as we consider more intense surface extremes and/or more extreme jet anomalies. The highest extreme event frequencies at the surface are observed in case of precipitation over the Mediterranean and Western Europe during anomalously zonal and/or fast jet events, pointing to these jet anomalies matching rather homogeneous large-scale atmospheric configurations with a clear surface footprint. Additionally, our results emphasise the usefulness of large deviation rate functions to estimate the frequency of occurrence of persistent jet anomalies, and more generally of unusual, persistent atmospheric circulation patterns." @default.
- W4321502009 created "2023-02-23" @default.
- W4321502009 creator A5058012315 @default.
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- W4321502009 date "2023-05-15" @default.
- W4321502009 modified "2023-09-30" @default.
- W4321502009 title "Persistent anomalies of the North Atlantic jet stream and associated surface extremes over Europe" @default.
- W4321502009 doi "https://doi.org/10.5194/egusphere-egu23-3942" @default.
- W4321502009 hasPublicationYear "2023" @default.
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