Voorhis Arthur D.

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Voorhis
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Arthur D.
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  • Technical Report
    Response characteristics of the neutrally boyant float
    (Woods Hole Oceanographic Institution, 1971-12) Voorhis, Arthur D.
    The response characteristics of the neutral buoyant vertical current meter are discussed primarily from a theoretical point of view. Computations are presented to illustrate the useful range and limitations of present instruments. Three aspects of the response are considered separately: rotational, vertical, and tilting due to vertical shear. The rotational response at low frequencies is poor only for very weak vertical currents due to viscous drag. At high frequencies the response is uniformly limited by the moment of inertia of the instrument. The vertical response is best in neutrally stable water. In highly stratified water, on the other hand, the response deteriorates for all frequencies because of the small relative flow past the instrument. In all cases it is limited at high frequencies because of instrument inertia.
  • Technical Report
    A quasi-Lagrangian study of mid-ocean variability using long range SOFAR floats
    (Woods Hole Oceanographic Institution, 1976-04) Rossby, H. Thomas ; Voorhis, Arthur D. ; Webb, Douglas C.
    Twenty neutrally buoyant SOFAR floats were used in the Mid-Ocean Dynamics Experiment (MODE) to study the structure and variability of the deep ocean currents. The floats were clustered so that the pattern of motions could be resolved (mapping and pattern recognition). A number of float trajectories are shown and the very individual character of their signature is emphasized. Some floats remain nearly stationary for a year whereas others will cover hundreds of kilometers to the south or west in just a few months. Superposition of all trajectories in the spaghetti diagram is shown to reveal considerable organization of the "eddy" field in the MODE area and is thought to be caused by the near presence of the Blake-Bahama Outer Ridge to the west. There is considerable asymmetry to the float dispersal with floats rapidly scattering to the south and west, but not to the north and east even though the r .m.s. velocities are a factor 3 to 6 times greater than the mean drift. The evolution and dispersal of the float cluster is illustrated in a set of figures in each of which a 12 day segment of all float trajectories is displayed. At times their mobility and relative motion is shown to be associated with onset of sudden swirls and regions of large horizontal shear, features that are not evident from the analysis of individual trajectories. Cluster averages of the float velocities and kinetic energy, computed weekly and plotted as a function of time, show substantial variability. Much better averages are obtained by limiting the cluster to floats within a geographical region. As the spaghetti diagram indicates and the following paper discusses in more detail there exist substantial geographical variations in the average kinetic energy levels. These may be in some way caused topographically by the close proximity to the continental margin. Whatever the reason they caution us to reexamine the notion that the scale of variation of the second order eddy statistics is large compared to the eddies themselves, at least in the MODE-I area. Ten floats also contained a system to record the local pressure, temperature and vertical currents. The pressure and temperature yield data concerning low frequency vertical displacements and the vertical current meters measure the internal wave sea state which is shown to be remarkably constant.
  • Technical Report
    Narrative of Chain cruise #17, phase I : St. George, Bermuda, to Freetown, Sierra Leone, 19 February - 22 March 1961
    (Woods Hole Oceanographic Institution, 1964-06) Voorhis, Arthur D. ; Bunce, Elizabeth T.
    The journal of a cruise of R/V CHAIN from Bermuda to Freetown, Sierra Leone during February and March, 1961, is the basis of this report. Location of observations are given. The portion of the Mid- Atlantic Ridge lying along the equator was surveyed from 10° to 19°W, and new information concerning the slope and orientation of rift zones was obtained. A detailed bathymetric survey of the Romanche Trench was made. A continuous temperature-depth profile, from the surface to 100 meters, was made along the ship 's track with a thermistor chain. Surface shear was measured with pitotmeters mounted on the chain (surface water velocity relative to the water velocity at the depth of the pitotmeter), to determine the strength and direction of the equatorial undercurrent.
  • Technical Report
    MODE SOFAR float in situ data summary
    (Woods Hole Oceanographic Institution, 1974-06) Voorhis, Arthur D. ; Benoit, Raymond R.
    Ten SOFAR floats were instrumented during the MODE field experiment to record pressure, temperature, and vertical water displacement during a four month drift. This report describes the acquisition and reduction of this data and then summarizes in graphical form some of the principal results.