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  • Deep Western Boundary Current  (1)
  • Eddies  (1)
  • Woods Hole Oceanographic Institution  (2)
  • 1
    Publication Date: 2022-05-26
    Description: Neutrally buoyant SOFAR floats at nominal depths of 800, 1800, and 3300 m were tracked for 21 months in the vicinity of western boundary currents near 6N and at several sites in the Atlantic near 11N and along the equator. Trajectories at 1800 m show a swift (〉50 cm/sec), narrow (100 km wide) southward-flowing Deep Western Boundary Current (DWBC) extending from 7N to the equator. At times (February-March 1989) DWBC water turned eastward and flowed along the equator and at other times (August-September 1990) the DWBC crossed the equator and continued southward. The mean velocity near the equator was eastward from February 1989 to February 1990 and westward from March 1990 to November 1990. Thus the cross-equatorial flow in the DWBC appeared to be linked to the direction of equatorial currents which varied over periods of more than a year. No obvious DWBC nor swift equatorial current was observed by 3300 m floats. Eight-hundred-meter floats revealed a northwestward intermediate level western boundary current although flow patterns were complicated. Three floats that significantly contributed to the northwestward flow looped in anticyclonic eddies that translated up the coast at 8 cm/sec. Six 800 m floats drifted eastward along the equator between 5S and 6N at a mean velocity of 11 cm/sec; one reached 5W in the Gulf of Guinea, suggesting that the equatorial current extended at least 35-40° along the equator. Three of these floats reversed direction near the end of the tracking period, implying low frequency fluctuations.
    Description: Funding was provided by the National Science Foundation through Grant Nos. OCE-8521082, OCE-8517375, and OCE-9114656.
    Keywords: SOFAR floats ; Equatorial currents ; Deep Western Boundary Current ; Oceanus (Ship : 1975-) Cruise ; Columbus Iselin (Ship) Cruise
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 5430190 bytes
    Format: application/pdf
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  • 2
    Publication Date: 2022-05-26
    Description: Also published as: Journal of Physical Oceanography (1979) 9: 1294-1297
    Description: It is demonstrated that the outcome of an intercomparison between data and the vertical distribution of eddy kinetic energy predicted by a previously developed numerical model of the MODE area is frequency dependent. In the range of periods from 50 to 150 or even to 400 days (one definition of the temporal mesoscale, the scale that the model was designed to simulate), the comparison is quite good. For periods in the range of 5 to 50 days, the agreement is poor. For periods longer than 400 days , the comparison is indeterminate. Earlier conclusions concerning the relation of model results to the MODE data should be qualified by stipulating frequency range , and future intercomparisons for any model in all regions should be conscious of the desirability of doing so across common frequencies.
    Description: Prepared for the Office of Naval Research under Contract N00014-76-C-0197; NR 083-400 and for the International Decade of Ocean Exploration Office of the National Science Foundation under Grant OCE 75-03962.
    Keywords: Mid-Ocean Dynamics Experiment (MODE) ; Ocean currents ; Eddies
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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