CMIP6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO

Yunlong LU; Junqiao FENG; Dunxin HU

doi:10.1007/s00343-023-3024-6

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CMIP6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO

Physics | Updated：2024-10-11

- CMIP6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO
- Journal of Oceanology and Limnology Vol. 42, Issue 2, Pages: 439-453(2024)
- Affiliations：
  
  1.Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Sciences, Qingdao 266071, China
  2.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China,4 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  fengjunqiao@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-023-3024-6
  CLC：
- Received：07 February 2022，
  
  Online First：12 June 2023，
  
  Published：01 March 2024
- Accepted：
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LU Yunlong,FENG Junqiao,HU Dunxin.CMIP6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO[J].Journal of Oceanology and Limnology,2024,42(02):439-453.
DOI：

LU Yunlong,FENG Junqiao,HU Dunxin.CMIP6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO[J].Journal of Oceanology and Limnology,2024,42(02):439-453. DOI： 10.1007/s00343-023-3024-6.

摘要

Abstract

The subtropical North and South Pacific Meridional Modes (NPMM and SPMM) are well known precursors of El Niño-Southern Oscillation (ENSO). However

relationship between them is not constant. In the early 1980

the relationship experienced an interdecadal transition. Changes in this connection can be attributed mainly to the phase change of the Pacific decadal oscillation (PDO). During the positive phase of PDO

a shallower thermocline in the central Pacific is responsible for the stronger trade wind charging (TWC) mechanism

which leads to a stronger equatorial subsurface temperature evolution. This dynamic process strengthens the connection between NPMM and ENSO. Associated with the negative phase of PDO

a shallower thermocline over southeastern Pacific allows an enhanced wind-evaporation-SST (WES) feedback

strengthening the connection between SPMM and ENSO. Using 35 Coupled Model Intercomparison Project Phase 6 (CMIP6) models

we examined the NPMM/SPMM performance and its connection with ENSO in the historical runs. The great majority of CMIP6 models can reproduce the pattern of NPMM and SPMM well

but they reveal discrepant ENSO and NPMM/SPMM relationship. The intermodal uncertainty for the connection of NPMM-ENSO is due to different TWC mechanism. A stronger TWC mechanism will enhance NPMM forcing. For SPMM

few models can simulate a good relationship with ENSO. The intermodel spread in the relationship of SPMM and ENSO owing to SST bias in the southeastern Pacific

as WES feedback is stronger when the southeastern Pacific is warmer.

关键词

Keywords

references

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