Asymmetric impact of Atlantic Multidecadal Oscillation on El Niño and la Niña characteristics

Mi Kyung Sung, Soon Il An, Baek Min Kim, Jong Seong Kug

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The long-lasting cold surface conditions of North Atlantic, i.e., the negative phase of Atlantic Multidecadal Oscillation (AMO), can intensify the El Niño-Southern Oscillation through the enhanced air-sea coupling under the increased central-to-eastern tropical Pacific mean sea surface temperature. However, the impact of warmer mean sea surface temperature (SST) is more efficient in the intensifying El Niño than La Niña, because of the nature of the exponential growth of atmospheric convection to SST change. Moreover, the farther eastward shift of the atmospheric convection during the negative AMO leads to the stronger El Niño due to the longer delayed negative feedback by oceanic waves. Therefore, the AMO mainly influences the El Niño intensity rather than La Niña intensity.

Original languageEnglish
Pages (from-to)4998-5004
Number of pages7
JournalGeophysical Research Letters
Volume42
Issue number12
DOIs
Publication statusPublished - 2015 Jun 28

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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