Arctic sea-ice loss is projected to lead to more frequent strong El Niño events.
Nat Commun
; 13(1): 4952, 2022 08 23.
Article
em En
| MEDLINE
| ID: mdl-35999238
ABSTRACT
Arctic sea ice has decreased substantially and is projected to reach a seasonally ice-free state in the coming decades. Little is known about whether dwindling Arctic sea ice is capable of influencing the occurrence of strong El Niño, a prominent mode of climate variability with global impacts. Based on time slice coupled model experiments, here we show that no significant change in the occurrence of strong El Niño is found in response to moderate Arctic sea-ice loss that is consistent with satellite observations to date. However, as the ice loss continues and the Arctic becomes seasonally ice-free, the frequency of strong El Niño events increases by more than one third, as defined by gradient-based indices that remove mean tropical Pacific warming induced by the seasonally ice-free Arctic. By comparing our time slice experiments with greenhouse warming experiments, we conclude that at least 37-48% of the increase of strong El Niño near the end of the 21st century is associated specifically with Arctic sea-ice loss. Further separation of Arctic sea-ice loss and greenhouse gas forcing only experiments implies that the seasonally ice-free Arctic might play a key role in driving significantly more frequent strong El Niño events.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Camada de Gelo
/
El Niño Oscilação Sul
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article