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- W4236088825 abstract "Abstract. The wintertime influence of El Niño-Southern Oscillation (ENSO) on subseasonal variability is revisited by identifying the dominant mode of covariability between 10–60 day band-pass-filtered surface air temperature (SAT) variability over the North American continent and winter-mean sea surface temperature (SST) over the North Pacific sector. We find, in agreement with previous studies, that La Niña conditions tend to enhance the subseasonal SAT variability over western North America. This modulation of subseasonal variability is achieved through interactions between subseasonal eddies and La Niña-related changes in the winter-mean circulation. Specifically, eastward-propagating quasi-stationary eddies over the North Pacific are more efficient in extracting energy from the mean flow through the baroclinic conversion of energy over the North Pacific sector during La Niña. Changes in the vertical structure of these wave anomalies are crucial to enhance the efficiency of energy conversion via amplified downgradient heat fluxes that energize subseasonal eddy thermal anomalies. The combination of increased subseasonal SAT variability and the cold winter-mean response to La Niña both contribute to enhancing the likelihood of cold extremes over western North America." @default.
- W4236088825 created "2022-05-12" @default.
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- W4236088825 date "2020-05-13" @default.
- W4236088825 modified "2023-10-13" @default.
- W4236088825 title "Influence of ENSO on North American subseasonal surface air temperature variability" @default.
- W4236088825 doi "https://doi.org/10.5194/wcd-2020-22" @default.
- W4236088825 hasPublicationYear "2020" @default.
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