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 journalArticle

4 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

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Atlantic Multidecadal Oscillation
sea surface temperature
atmospheric convection
oscillations
convection
cold surfaces
atmosphere-ocean coupling
Southern Oscillation
negative feedback
shift
air

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Sung, Mi Kyung ; An, Soon-Il ; Kim, Baek Min ; Kug, Jong Seong. / Asymmetric impact of Atlantic Multidecadal Oscillation on El Niño and la Niña characteristics. In: Geophysical Research Letters. 2015 ; Vol. 42, No. 12. pp. 4998-5004.
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abstract = "The long-lasting cold surface conditions of North Atlantic, i.e., the negative phase of Atlantic Multidecadal Oscillation (AMO), can intensify the El Ni{\~n}o-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 Ni{\~n}o than La Ni{\~n}a, 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 Ni{\~n}o due to the longer delayed negative feedback by oceanic waves. Therefore, the AMO mainly influences the El Ni{\~n}o intensity rather than La Ni{\~n}a intensity.",
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Asymmetric impact of Atlantic Multidecadal Oscillation on El Niño and la Niña characteristics. / Sung, Mi Kyung; An, Soon-Il; Kim, Baek Min; Kug, Jong Seong.

In: Geophysical Research Letters, Vol. 42, No. 12, 28.06.2015, p. 4998-5004.

Research output: Contribution to journalArticle

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AB - 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.

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