Modulation by the Atlantic Multidecadal Oscillation of the intensity of the interannual seesaw between the Somali and Australian cross-equatorial flows

Shuanglin LI, Ying CHEN, Chen LI

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Abstract

The decadal variation of the intensity of the interannual opposite connection (seesaw) between the Somali and Australian cross-equatorial flows (CEFs) is investigated. During the period prior to the mid-1960s, and after the early-2000s, the intensity of the interannual seesaw connection is significantly weaker relative to the period between. Such interdecadal shifts in the interannual seesaw intensity bear a resemblance to the decadal shift in ENSO’s strength, and can be further attributed to the phase transition of the Atlantic Multidecadal Oscillation (AMO). When the AMO is in a positive phase, the ENSO amplitude reduces and the seesaw strength becomes weakened, and vice versa. The historical simulation outputs of the CMIP5 models are used to verify the connection, and a similar result was obtained. Thus, the notion that the intensity of the interannual opposite connection (seesaw) between the CEFs is modulated by the AMO is robust.

Original languageEnglish
Pages (from-to)306-311
Number of pages6
JournalAtmospheric and Oceanic Science Letters
Volume10
Issue number4
DOIs
Publication statusPublished - 4 Jul 2017
Externally publishedYes

Keywords

  • AMO)
  • Atlantic Multidecadal Oscillation
  • Cross-equatorial flow
  • East Asian summer rainfall
  • ENSO

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