Equatorward shift of annual Rossby waves in the Equatorial Pacific Ocean

Xiao Ma; Che Sun

doi:10.1007/s00343-015-4405-2

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Equatorward shift of annual Rossby waves in the Equatorial Pacific Ocean

Updated：2023-05-16

- Equatorward shift of annual Rossby waves in the Equatorial Pacific Ocean
- Journal of Oceanology and Limnology Vol. 34, Issue 1, Pages: 212-218(2016)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-015-4405-2
  CLC：
- Online First：01 August 2015，
  
  Published：2016
- Accepted：
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Ma, X., Sun, C. Equatorward shift of annual Rossby waves in the Equatorial Pacific Ocean., Chin. J. Ocean. Limnol. 34, 212–218 (2016). https://doi.org/10.1007/s00343-015-4405-2
DOI：

Ma, X., Sun, C. Equatorward shift of annual Rossby waves in the Equatorial Pacific Ocean., Chin. J. Ocean. Limnol. 34, 212–218 (2016). https://doi.org/10.1007/s00343-015-4405-2 DOI：

摘要

Abstract

Annual Rossby wave is a key component of the ENSO phenomenon in the equatorial Pacific Ocean. Due to the paucity and seasonal bias in historical hydrographic data

previous studies on equatorial Rossby waves only gave qualitative description. The accumulation of Argo measurements in recent years has greatly alleviated the data problem. In this study

seasonal variation of the equatorial Pacific Ocean is examined with annual harmonic analysis of Argo gridded data. Results show that strong seasonal signal is present in the western equatorial Pacific and explains more than 50% of the thermal variance below 500 m. Lag-correlation tracing further shows that this sub-thermocline seasonal signal originates from the eastern equatorial Pacific via downward and southwestward propagation of annual Rossby waves. Possible mechanisms for the equatorward shift of Rossby wave path are also discussed.

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Keywords

references

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