基于Argo轨迹资料反演热带太平洋中层流场条带状结构特征*

doi:10.11978/2017001

Abstract

Abstract:

The characteristics and variation of mid-depth zonal jets in the tropical Pacific Ocean are examined using the trajectory of Argo floats. The method to estimate zonal intermediate currents based on Argo trajectory data is more appropriate in the equatorial region because it is free of the restrictions imposed by the methods based on the referenced velocity and Coriolis force. The results indicate that in the equatorial Pacific Ocean, the mid-layer (1000 dbar) zonal jets have a symmetric band-like structure in both Northern and Southern Hemispheres. The strong jets are centered near the equatorial regions, whereas there are several eastward zonal jets in the off-equatorial ocean (9°N, 13°N, 18°N). In addition, the characteristics of temporal variability are relatively complex. In the near-equatorial area, seasonal scale is the major and most important component, while in the off-equatorial region multiple time scale processes dominate. The Rossby wave dynamics and local response probably contribute to this difference.

Key words: tropical Pacific Ocean, mid-depth current, zonal jet, Argo float, seasonal variability

CLC Number:

P731.21

Yifan XIA, Yan DU, Tianyu WANG, Qiang XIE. Mid-depth zonal jets and their characteristics in the tropical Pacific Ocean derived from Argo trajectory[J].Journal of Tropical Oceanography, 2017, 36(4): 1-9.

Figures/Tables 7

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Mid-depth zonal jets and their characteristics in the tropical Pacific Ocean derived from Argo trajectory

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