{"id":451128,"date":"2026-06-19T08:40:57","date_gmt":"2026-06-19T15:40:57","guid":{"rendered":"https:\/\/climatescience.press\/?p=451128"},"modified":"2026-06-19T08:40:59","modified_gmt":"2026-06-19T15:40:59","slug":"super-el-ninos-lose-their-signature-punch-as-the-world-warms","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=451128","title":{"rendered":"Super El Ni\u00f1os Lose Their Signature Punch as the World Warms"},"content":{"rendered":"\n
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Extreme El Ni\u00f1o events<\/strong>, sometimes called “super El Ni\u00f1os”<\/strong>, are the strongest, most impactful members of the warm phase of the El Ni\u00f1o\u2013Southern Oscillation (ENSO)<\/strong>. They stand out from moderate El Ni\u00f1os <\/strong>due to their exceptional intensity, spatial characteristics, and nonlinear atmospheric responses.<\/p>\n\n\n\n

Historical Examples<\/strong><\/p>\n\n\n\n

The clearest modern extreme events are:<\/p>\n\n\n\n

1982\u201383:<\/strong> One of the strongest on record; caused massive flooding in Peru\/Ecuador\/California, droughts in Australia\/Indonesia, and significant global temperature spikes.<\/p>\n\n\n\n

1997\u201398:<\/strong> Often considered the benchmark “super” event; record SST anomalies, widespread fires in Southeast Asia and Amazon, coral bleaching, and strong North American impacts (e.g., heavy California rains, mild Northeast winters).<\/p>\n\n\n\n

2015\u201316: <\/strong>Comparable in strength (especially as a mixed eastern\/central Pacific type); contributed to record global temperatures and major regional extremes.<\/p>\n\n\n\n

Earlier candidates include 1876\u201378 and 1972\u201373, with varying data quality.<\/p>\n\n\n\n

These events typically peak in boreal winter (DJF) and last 9\u201318 months.<\/p>\n\n\n\n

La Ni\u00f1a teleconnection patterns<\/strong><\/p>\n\n\n\n

La Ni\u00f1a teleconnection patterns<\/strong> refer to the atmospheric wave trains and remote climate impacts triggered by the cold phase of ENSO (cooler-than-average sea surface temperatures in the central-eastern equatorial Pacific). Unlike extreme El Ni\u00f1os, La Ni\u00f1a patterns are generally more symmetric with moderate El Ni\u00f1os but opposite in sign.<\/p>\n\n\n\n

NOAA CPC, studies using reanalysis (ERA5), and CMIP models. Composites often use events exceeding -0.5\u00b0C (or stronger thresholds) in Ni\u00f1o-3.4.<\/p>\n\n\n\n

La Ni\u00f1a patterns are generally more “reliable” in a linear sense than extreme El Ni\u00f1os but still modulated by internal variability, event strength, and location (e.g., central vs. eastern Pacific flavors).<\/p>\n\n\n\n

North Atlantic oscillation impacts<\/strong><\/p>\n\n\n\n

North Atlantic Oscillation (NAO) <\/strong>is one of the most influential modes of atmospheric variability in the Northern Hemisphere, particularly during winter. It manifests as a seesaw in sea-level pressure (or 500 hPa geopotential height) between the Icelandic Low (near Iceland\/Greenland) and the Azores High (subtropical North Atlantic).<\/p>\n\n\n\n

The NAO index is typically measured as the normalized pressure difference between stations like Iceland and the Azores\/Lisbon.<\/p>\n\n\n\n

The NAO explains a large fraction of winter climate variability over the North Atlantic sector but interacts with other modes (e.g., AO\/AAO, PNA, stratospheric influences). Predictability is seasonal at best, aided by ocean memory and teleconnections.<\/p>\n\n\n\n

A new study in Geophysical Research Letters examining how extreme (“super”) El Ni\u00f1o events could behave differently under future climate warming.<\/strong><\/p>\n\n\n\n

_____________________________________________________________________________________<\/p>\n\n\n\n

Reduced Distinctiveness of Extreme El Ni\u00f1o Teleconnections in Warmer Climates<\/strong><\/p>\n\n\n\n

“Reduced Distinctiveness of Extreme El Ni\u00f1o Teleconnections in Warmer Climates” <\/strong>is a 2026 research letter by Margot Beniche and colleagues (J\u00e9r\u00f4me Vialard, Andr\u00e9a S. Taschetto, Matthieu Lengaigne) published in Geophysical Research Letters (DOI: 10.1029\/2025GL121189). It is open access.<\/p>\n\n\n\n

In the current climate, extreme El Ni\u00f1o event<\/strong>s (e.g., 1982\u201383, 1997\u201398) \u2014 defined by strong eastward-shifted sea surface temperature (SST) anomalies<\/strong> and intense eastern Pacific rainfall (>5 mm\/day) \u2014 produce distinctive atmospheric teleconnections.<\/p>\n\n\n\n

These differ from moderate El Ni\u00f1os and La Ni\u00f1as<\/strong> by triggering nonlinear tropical convection, leading to an eastward-shifted pattern resembling the Tropical\/Northern Hemisphere (TNH) pattern rather than the classic Pacific-North American (PNA) pattern.<\/p>\n\n\n\n

This paper builds directly on the authors’ prior work (e.g., Beniche et al. 2024 in Scientific Reports) establishing that extreme El Ni\u00f1os<\/strong> are not just stronger versions of moderate ones. They trigger unique nonlinear atmospheric responses due to intense eastern Pacific rainfall (>5 mm\/day), shifting tropical convection eastward and producing a TNH-like (Tropical\/Northern Hemisphere) teleconnection pattern rather than the standard PNA (Pacific-North American) pattern.<\/p>\n\n\n\n

Why “Distinctiveness” Matters in the Present Climate<\/strong><\/p>\n\n\n\n

Moderate El Ni\u00f1os and La Ni\u00f1as<\/strong> \u2192 Produce symmetric, classic PNA responses: warming\/drying in the Northwest, some West Coast effects, but limited penetration to the eastern US.<\/p>\n\n\n\n

Extreme El Ni\u00f1os <\/strong>(1982\u201383, 1997\u201398, arguably 2015\u201316) \u2192 Larger eastward-shifted SST anomalies drive basin-wide reorganization of tropical heat sources via nonlinear convection (convection threshold crossed in the normally dry east Pacific).<\/p>\n\n\n\n

This yields:<\/p>\n\n\n\n