Archives par mot-clé : El Nino

Tropical explosive volcanic eruptions can trigger El Niño by cooling tropical Africa

by M. Khodri et al., October 3,  2017 in Nature

Stratospheric aerosols from large tropical explosive volcanic eruptions backscatter shortwave radiation and reduce the global mean surface temperature. Observations suggest that they also favour an El Niño within 2 years following the eruption. Modelling studies have, however, so far reached no consensus on either the sign or physical mechanism of El Niño response to volcanism

The Little Boy, El Nino and Natural Climate Change

by Anastasios Tsonis, September 15, 2017 in GWPF Report26 (.pdf)

This report describes this phenomenon and brings it into a modern global con- text. But the story is more than simply one of some old South American geophysical phenomenology seen from a global perspective; it is tied to an extraordinary story about new scienti c thinking, arising at the end of the 20th century, concerning the nature of change itself.

2015-16 El Nino behind large-scale surface melting event in Antarctica

by Nature Communications, June 15, 2017 in ClimatChangeDispatch

The West Antarctic Ice Sheet, a landbound mass of ice larger than Mexico, experienced substantial surface melt through the austral summer of 2015-2016 during one of the largest El Niño events of the past 50 years, according to scientists who had been conducting the first comprehensive atmospheric measurements in the region since the 1960s.

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Extreme temperatures in Southeast Asia caused by El Niño and worsened by global warming

by K. Thirumalai et al., June 6, 2017, in Nature Communication

In April 2016, southeast Asia experienced surface air temperatures (SATs) that surpassed national records, exacerbated energy consumption, disrupted agriculture and caused severe human discomfort. Here we show using observations and an ensemble of global warming simulations the combined impact of the El Niño/Southern Oscillation (ENSO) phenomenon and long-term warming on regional SAT extremes. We find a robust relationship between ENSO and southeast Asian SATs wherein virtually all April extremes occur during El Niño years.