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El Niño exhibits distinct Eastern Pacific (EP) and Central Pacific (CP) types which are commonly, but not always consistently, distinguished from each other by different signatures in equatorial climate variability. Here we propose an index based on evolving climate networks to objectively discriminate between both flavors by utilizing a scalar-valued measure that quantifies spatial localization and dispersion in global teleconnections of surface air temperature. Our index displays a sharp peak (high localization) during EP events, whereas during CP events (larger dispersion) it remains close to the values observed during normal periods. In contrast to previous classification schemes, our approach specifically accounts for El Niño's global impacts. We confirm recent El Niño classifications for the years 1951 to 2014 and assign types to those cases where former works yielded ambiguous results. Ultimately, we demonstrate that our index provides a similar discrimination of La Niña episodes into two distinct types.
Research news | 2017-10-19
The starting point for a rethink on how we produce our food
Research news | 2017-10-18
Beatrice Crona awarded fellowship in new leadership programme on global health
Research news | 2017-10-16
How investments in solar energy go beyond access to electricity to positively affect people’s life expectancy and years of schooling
Research news | 2017-10-12
Stockholm Resilience Centre acts as impact partner for their Global Solutions Program
Research news | 2017-10-11
How pro-environmental interest groups were able to push for reforms of the EU Common Fisheries Policy
Educational news | 2017-10-02
Introducing our new executive programme in resilience thinking