The Impacts of El Niño Diversity on Northern Hemisphere Atmospheric Blocking

Atmospheric blocking events are persistent quasi-stationary geopotential height anomalies that divert the jet stream from its climatological path in mid- to high-latitudes. Previous studies have found different phases of El Niño–Southern Oscillation (ENSO) influence characteristics blocking, but none considered spatial diversity Niño. In this study, we examine Northern Hemisphere with respect “Central Pacific” (CP) and “Eastern (EP) flavors Niño 83 years ERA5 reanalysis. The two dissimilar patterns forcing on atmospheric circulation impact strength placement upper-level stream, thus affecting event frequency duration. Significant contrasts between CP EP disregarded when a single ENSO index is used, emphasize should be future investigations ENSO-related variability.