Subduction of South Pacific waters

Tangdong Qu, Shan Gao, Ichiro Fukumori, Rana A Fine, Eric J. Lindstrom

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Using existing high-resolution CTD observations, complemented by a large amount of recently available Argo floating data, this study provides a detailed description of the subduction of South Pacific waters. With a significantly improved climatological dataset on the mixed layer properties, we obtain an annual subduction rate of 48.8 Sv (1 SV = 106 M3 s-1) from 1O°S to 60°S in the South Pacific. Two peaks stand out in this subduction rate sorted by winter mixed layer density: one corresponds to the formation of eastern Subtropical Mode Water (STMW) and part of the Subtropical Underwater (SUW) between 25.0 and 25.5 σθ, and the other has a density range between 26.6 and 27.1 σθ, representing the formation of Sub-Antarctic Mode Water and Antarctic Intermediate Water (SAMW/AAIW). The subduction in eastern STMW/SUW range is 12.7 Sv, only slightly smaller than that (14.6 Sv) associated with the SAMW/AAIW. Sandwiched between these two peaks, roughly in the density range between 26.0 and 26.5 σθ, is the southwestern STMW, with a relatively small annual subdution 5.6 Sv. Uncertainties of these estimates are discussed.

Original languageEnglish (US)
Article numberL02610
JournalGeophysical Research Letters
Volume35
Issue number2
DOIs
StatePublished - Jan 28 2008

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mode water
subduction
Antarctic Intermediate Water
water
mixed layer
Argo
charge transfer devices
floating
winter
high resolution
estimates

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Qu, T., Gao, S., Fukumori, I., Fine, R. A., & Lindstrom, E. J. (2008). Subduction of South Pacific waters. Geophysical Research Letters, 35(2), [L02610]. https://doi.org/10.1029/2007GL032605

Subduction of South Pacific waters. / Qu, Tangdong; Gao, Shan; Fukumori, Ichiro; Fine, Rana A; Lindstrom, Eric J.

In: Geophysical Research Letters, Vol. 35, No. 2, L02610, 28.01.2008.

Research output: Contribution to journalArticle

Qu, T, Gao, S, Fukumori, I, Fine, RA & Lindstrom, EJ 2008, 'Subduction of South Pacific waters', Geophysical Research Letters, vol. 35, no. 2, L02610. https://doi.org/10.1029/2007GL032605
Qu, Tangdong ; Gao, Shan ; Fukumori, Ichiro ; Fine, Rana A ; Lindstrom, Eric J. / Subduction of South Pacific waters. In: Geophysical Research Letters. 2008 ; Vol. 35, No. 2.
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