Warming and circulation change in the eastern South Pacific Ocean

Warming and circulation change in the eastern South Pacific Ocean Deep‐ocean temperature, salinity and dissolved oxygen observations in the eastern South Pacific Ocean collected during the late austral fall in 1995 are compared with observations made there 28 years earlier during the same season and similar El Niño‐Southern Oscillation phase. Warming observed above 800 m at 43°S reflects the production of warmer Subantarctic Mode Water in recent decades. Warming observed above 1600 m at 28°S is due to downward isotherm displacement and southward movement of water masses by 100–200 km, as revealed by joint analysis of temperature and oxygen data. Such changes would be expected for a weaker subtropical gyre in the South Pacific. An observed oxygen decrease between about 1800 m and 2900 m at 28°S may indicate enhanced southward, boundary current flow at mid‐depths off Chile. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Warming and circulation change in the eastern South Pacific Ocean

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Publisher
Wiley
Copyright
Copyright © 2000 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/1999GL010952
Publisher site
See Article on Publisher Site

Abstract

Deep‐ocean temperature, salinity and dissolved oxygen observations in the eastern South Pacific Ocean collected during the late austral fall in 1995 are compared with observations made there 28 years earlier during the same season and similar El Niño‐Southern Oscillation phase. Warming observed above 800 m at 43°S reflects the production of warmer Subantarctic Mode Water in recent decades. Warming observed above 1600 m at 28°S is due to downward isotherm displacement and southward movement of water masses by 100–200 km, as revealed by joint analysis of temperature and oxygen data. Such changes would be expected for a weaker subtropical gyre in the South Pacific. An observed oxygen decrease between about 1800 m and 2900 m at 28°S may indicate enhanced southward, boundary current flow at mid‐depths off Chile.

Journal

Geophysical Research LettersWiley

Published: May 1, 2000

References

  • A new method of interpolation and smooth curve fitting based on local procedures
    Akima, Akima
  • Interannual and decadal temperature variability in the Southwest Pacific Ocean between 1955 and 1988
    Holbrook, Holbrook; Bindoff, Bindoff
  • A neutral density variable for the world's oceans
    Jackett, Jackett; McDougall, McDougall
  • Satellite altimetry, the marine geoid, and the oceanic general circulation
    Wunsch, Wunsch; Stammer, Stammer

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