Paper in Press
JOURNAL OF GEOPHYSICAL RESEARCH, doi:10.1029/2011JC007755
An Intensification Trend of South Pacific Mode Water Subduction Rates over the 20th Century
- Subduction of Mode Water is intensified in the South Pacific
- Subtropical mode waters are intensified by the vertical pumping
- Subduction in the ACC region is intensified by the lateral induction
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 Mode Waters 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. The intensification of the South Pacific Subantarctic Mode Water (SAMW) forms a contrast to the Subtropical Model Water (STMW), which displays a positive linear trend over the past century mainly due to 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.
Received 14 November 2011; accepted 29 May 2012.
Citation: (2012), An Intensification Trend of South Pacific Mode Water Subduction Rates over the 20th Century, J. Geophys. Res., doi:10.1029/2011JC007755, in press.