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Acta Oceanologica Sinica

, Volume 38, Issue 11, pp 62–69 | Cite as

Sea level anomalies in the northwestern Pacific during 2011 associated with La Niña and negative Indian Ocean Dipole

  • Fuwen QiuEmail author
  • Yun Qiu
  • Aijun Pan
  • Jing Cha
  • Shanwu Zhang
Article
  • 6 Downloads

Abstract

The sea level anomalies (SLAs) pattern in the northwestern Pacific delineated significant differences between La Niña events occurring with and without negative Indian Ocean Dipole (IOD) events. During the pure La Niña events, positive the sea surface level anomalies (SLAs) appear in the northwestern Pacific, but SLAs are weakened and negative SLAs appear in the northwestern Pacific under the contribution of the negative IOD events in 2010/2011. The negative IOD events can trigger significant westerly wind anomalies in the western tropical Pacific, which lead to the breakdown of the pronounced positive SLAs in the northwestern Pacific. Meanwhile, negative SLAs excited by the positive wind stress curl near the dateline propagated westward in the form of Rossby waves until it approached the western Pacific boundary in mid-2011, which maintained and enhanced the negative phase of SLAs in the northwestern Pacific and eventually, it could significantly influence the bifurcation and transport of the North Equatorial Current (NEC).

Key words

sea level anomalies La Niña negative IOD northwestern Pacific 

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Notes

Acknowledgements

We are grateful to Qiang Wang and Jianqiong Zhan for discussion and comments on the paper.

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Copyright information

© Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Fuwen Qiu
    • 1
    Email author
  • Yun Qiu
    • 1
    • 2
  • Aijun Pan
    • 1
  • Jing Cha
    • 1
  • Shanwu Zhang
    • 1
  1. 1.Third Institute of OceanographyMinistry of Natural ResourcesXiamenChina
  2. 2.Laboratory for Regional Oceanography and Numerical ModelingPilot National Laboratory for Marine Science and Technology (Qingdao)QingdaoChina

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