Chinese Journal of Oceanology and Limnology

, Volume 34, Issue 6, pp 1383–1393 | Cite as

Absolute geostrophic currents in global tropical oceans

  • Lina Yang (杨丽娜)
  • Dongliang Yuan (袁东亮)
Physics
  • 80 Downloads

Abstract

A set of absolute geostrophic current (AGC) data for the period January 2004 to December 2012 are calculated using the P-vector method based on monthly gridded Argo profiles in the world tropical oceans. The AGCs agree well with altimeter geostrophic currents, Ocean Surface Current Analysis-Real time currents, and moored current-meter measurements at 10-m depth, based on which the classical Sverdrup circulation theory is evaluated. Calculations have shown that errors of wind stress calculation, AGC transport, and depth ranges of vertical integration cannot explain non-Sverdrup transport, which is mainly in the subtropical western ocean basins and equatorial currents near the Equator in each ocean basin (except the North Indian Ocean, where the circulation is dominated by monsoons). The identified non-Sverdrup transport is thereby robust and attributed to the joint effect of baroclinicity and relief of the bottom (JEBAR) and mesoscale eddy nonlinearity.

Keywords

P-vector absolute geostrophic currents world tropical oceans Sverdrup balance 

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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Lina Yang (杨丽娜)
    • 1
    • 2
    • 3
  • Dongliang Yuan (袁东亮)
    • 1
    • 3
    • 4
  1. 1.Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Key Laboratory of Ocean Circulation and WavesChinese Academy of SciencesQingdaoChina
  4. 4.Qingdao Collaborative Innovation Center of Marine Science and TechnologyQingdaoChina

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