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Keywords:

  • SODA;
  • subduction;
  • trend

[1] In this paper, the trend of the South Pacific Mode Water subduction rate is assessed based on recently developed ocean and atmosphere reanalysis products for the 20th century. It is found that the subduction volume of the mode water is intensified in the 20th century. The intensification of the mode water in the subtropical gyre of the South Pacific is primarily due to the strengthening of the vertical pumping velocity dominated by the enhanced wind stress curl over the past century. In contrast, the intensification of the South Pacific Subantarctic Mode Water (SAMW) is mainly caused by a deepening of the mixed layer depths and a strengthening of the advection in warm climate. As a result, the total subduction volume of the mode water over the South Pacific is increased in the 20th century.