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  • English  (2)
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  • 1
    Online Resource
    Online Resource
    Pacific subtropical cell variability in the SODA 2.0.2/3 assimilation (2008)
    Associated volumes
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    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 35(2008), 1944-8007
    In: volume:35
    In: year:2008
    In: extent:6
    Description / Table of Contents: A new version of SODA, which covers the time period 19582005, is used to analyze decadal variability of the Pacific Subtropical Cell (STC) circulation. The analysis is based on transport time series across 9 S and 9 N. At the interannual time scale, STC convergence anomalies decrease during El Ninos and increase during La Ninas through Sverdrup transport convergence changes. At decadal time scales, the assimilation shows a reduction of interior STC convergence of about 8 Sv from the 1960s to the 1990s and a subsequent rebound into the early 2000s by a similar amount, in agreement with the STC tendencies reported earlier from geostrophic section analysis, and associated with the occurrence and intensity of ENSO events among the decades analyzed. The results are compared with, and differ significantly from, those obtained by the German ECCO (GECCO) assimilation.
    Type of Medium: Online Resource
    Pages: 6 , graph. Darst
    ISSN: 1944-8007
    DOI: 10.1029/2008GL033757
    Language: English
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  • 2
    E-Resource
    E-Resource
    Middepth circulation of the eastern tropical South Pacific and its link to the oxygen minimum zone (2011)
    Associated volumes
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    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 116(2011), 2169-9291
    In: volume:116
    In: year:2011
    Description / Table of Contents: There is an incomplete description of the middepth circulation and its link to the oxygen minimum zone (OMZ) in the eastern tropical South Pacific. Subsurface currents of the OMZ in the eastern tropical South Pacific are investigated with a focus at 400 m depth, close to the core of the OMZ, using several acoustic Doppler current profiler sections recorded in January and February 2009. Five profiling floats with oxygen sensors were deployed along 85°50′W in February 2009 with a drift depth at 400 m. Their spreading paths are compared with the model flow field from a 1/10° tropical Pacific model (TROPAC01) and the Simple Ocean Data Assimilation (SODA) model. Overall the mean currents in the eastern tropical South Pacific are weak so that eddy variability influences the flow and ultimately feeds oxygen-poor water to the OMZ. The center of the OMZ is a stagnant area so that floats stay much longer in this region and can even reverse direction. In one case, one float deployed at 8°S, returned to the same location after 15 months. On the northern side of the OMZ in the equatorial current system, floats move rapidly to the west. Most current bands reported for the near-surface layer exist also in the depth range of the OMZ. A schematic circulation flow field for the OMZ core depth is derived which shows the northern part of the South Pacific subtropical gyre south of the OMZ and the complicated zonal equatorial flow field north of the OMZ.
    Type of Medium: Electronic Resource
    Pages: graph. Darst
    ISSN: 2169-9291
    Language: English
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