Intraseasonal variability of the equatorial Pacific Ocean and its relationship with ENSO based on Self-Organizing Maps analysis

Junqiao FENG; Fujun WANG; Qingye WANG; Dunxin HU

doi:10.1007/s00343-020-9328-x

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Intraseasonal variability of the equatorial Pacific Ocean and its relationship with ENSO based on Self-Organizing Maps analysis

Physics | Updated：2023-04-27

- Intraseasonal variability of the equatorial Pacific Ocean and its relationship with ENSO based on Self-Organizing Maps analysis
- Journal of Oceanology and Limnology Vol. 38, Issue 4, Pages: 1108-1122(2020)
- Affiliations：
  
  1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Sciences, Qingdao 266071, China
  3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  4.Function Laboratory for Ocean Dynamics and Climate, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
- Author bio：
  
  FENG Junqiao, fengjunqiao@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-020-9328-x
  CLC：
- Received：19 December 2019，
  
  Accepted：26 January 2020，
  
  Online First：27 March 2020，
  
  Published：2020-07
- Accepted：
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Junqiao FENG, Fujun WANG, Qingye WANG, et al. Intraseasonal variability of the equatorial Pacific Ocean and its relationship with ENSO based on Self-Organizing Maps analysis[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1108-1122.
DOI：

Junqiao FENG, Fujun WANG, Qingye WANG, et al. Intraseasonal variability of the equatorial Pacific Ocean and its relationship with ENSO based on Self-Organizing Maps analysis[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1108-1122. DOI： 10.1007/s00343-020-9328-x.

摘要

Abstract

We investigated the intraseasonal variability of equatorial Pacific subsurface temperature and its relationship with El Niño-Southern Oscillation (ENSO) using Self-Organizing Maps (SOM) analysis. Variation in intraseasonal subsurface temperature is mainly found along the thermocline. The SOM patterns concentrate in basin-wide seesaw or sandwich structures along an east-west axis. Both the seesaw and sandwich SOM patterns oscillate with periods of 55 to 90 days

with the sequence of them showing features of equatorial intraseasonal Kelvin wave

and have marked interannual variations in their occurrence frequencies. Further examination shows that the interannual variability of the SOM patterns is closely related to ENSO; and maxima in composite interannual variability of the SOM patterns are located in the central Pacific during CP El Niño and in the eastern Pacific during EP El Niño. These results imply that some of the ENSO forcing is manifested through changes in the occurrence frequency of intraseasonal patterns

in which the change of the intraseasonal Kelvin wave plays an important role.

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references

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