Publications des scientifiques de l'IRD

Khodri Myriam, Izumo Takeshi, Vialard Jérôme, Janicot Serge, Cassou C., Lengaigne Matthieu, Mignot Juliette, Gastineau G., Guilyardi E., Lebas N., Robock A., McPhaden M. J. (2017). Tropical explosive volcanic eruptions can trigger El Nino by cooling tropical Africa [+ Correction, 2018, vol. 9, art. no 855]. Nature Communications, 8, art. no 778 [13 p.+ Correction art.no 855, 1 p.]. ISSN 2041-1723.

Titre du document
Tropical explosive volcanic eruptions can trigger El Nino by cooling tropical Africa [+ Correction, 2018, vol. 9, art. no 855]
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000412134000004
Auteurs
Khodri Myriam, Izumo Takeshi, Vialard Jérôme, Janicot Serge, Cassou C., Lengaigne Matthieu, Mignot Juliette, Gastineau G., Guilyardi E., Lebas N., Robock A., McPhaden M. J.
Source
Nature Communications, 2017, 8, art. no 778 [13 p.+ Correction art.no 855, 1 p.] ISSN 2041-1723
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 Nino within 2 years following the eruption. Modelling studies have, however, so far reached no consensus on either the sign or physical mechanism of El Nino response to volcanism. Here we show that an El Nino tends to peak during the year following large eruptions in simulations of the Fifth Coupled Model Intercomparison Project (CMIP5). Targeted climate model simulations further emphasize that Pinatubo-like eruptions tend to shorten La Ninas, lengthen El Ninos and induce anomalous warming when occurring during neutral states. Volcanically induced cooling in tropical Africa weakens the West African monsoon, and the resulting atmospheric Kelvin wave drives equatorial westerly wind anomalies over the western Pacific. This wind anomaly is further amplified by air-sea interactions in the Pacific, favouring an El Nino-like response.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Géophysique interne [066]
Description Géographique
AFRIQUE ; PACIFIQUE
Localisation
Fonds IRD [F B010071053]
Identifiant IRD
fdi:010071053
Contact