Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean

Junqiao Feng; Xuezhi Bai; Yongli Chen; Dunxin Hu

doi:10.1007/s00343-010-9264-2

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Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean

Updated：2023-05-16

- Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean
- Journal of Oceanology and Limnology Vol. 28, Issue 2, Pages: 344-353(2010)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. Key Laboratory of Ocean Circulation and Waves Chinese Academy of Sciences
  3. Graduate University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9264-2
  CLC：
- Online First：20 March 2010，
  
  Published：2010
- Accepted：
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Feng, J., Bai, X., Chen, Y. et al. Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean., Chin. J. Ocean. Limnol. 28, 344–353 (2010). https://doi.org/10.1007/s00343-010-9264-2
DOI：

Feng, J., Bai, X., Chen, Y. et al. Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean., Chin. J. Ocean. Limnol. 28, 344–353 (2010). https://doi.org/10.1007/s00343-010-9264-2 DOI：

摘要

Abstract

We investigate the influence of low-frequency Rossby waves on the thermal structure of the upper southwestern tropical Indian Ocean (SWTIO) using Argo profiles

satellite altimetric data

sea surface temperature

wind field data and the theory of linear vertical normal mode decomposition. Our results show that the SWTIO is generally dominated by the first baroclinic mode motion. As strong downwelling Rossby waves reach the SWTIO

the contribution of the second baroclinic mode motion in this region can be increased mainly because of the reduction in the vertical stratification of the upper layer above thermocline

and the enhancement in the vertical stratification of the lower layer under thermocline also contributes to it. The vertical displacement of each isothermal is enlarged and the thermal structure of the upper level is modulated

which is indicative of strong vertical mixing. However

the cold Rossby waves increase the vertical stratification of the upper level

restricting the variability related to the second baroclinic mode. On the other hand

during decaying phase of warm Rossby waves

Ekman upwelling and advection processes associated with the surface cyclonic wind circulation can restrain the downwelling processes

carrying the relatively colder water to the near-surface

which results in an out-of-phase phenomenon between sea surface temperature anomaly (SSTA) and sea surface height anomaly (SSHA) in the SWTIO.

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references

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