Moller Donald A.

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Moller
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Donald A.
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  • Technical Report
    Observations of the Antarctic polar front during FDRAKE 76 : a cruise report
    (Woods Hole Oceanographic Institution, 1976-11) Joyce, Terrence M. ; Dean, Jerome P. ; McCartney, Michael S. ; Millard, Robert C. ; Moller, Donald A. ; Voorhis, A. ; Dahm, C. ; Georgi, Daniel T. ; Kullenberg, G. ; Toole, John M. ; Zenk, Walter
    During March/April 1976 the small-scale structure of the Antarctic Polar Front was observed in the Drake Passage. The observations were part of the International Southern Ocean Studies (ISOS) program called FDRAke 76. The purpose of the program was to obtain densely sampled measurements of temperature, salinity, dissolved oxygen, and chemical nutrients in the Polar Front Zone (PFZ) and pilot measurements of horizontal and vertical velocities in order to explain the above scalar variability. The PFZ is a region where Antarctic and sub-Antarctic waters intermingle and presumably mix to affect the properties of Antarctic Intermediate Water. A report on the third leg of Cruise 107 of the R. V. THOMPSON is presented as well as a description of the measurements and a preliminary report of the data. A feature of interest is the pinching off of a northward meander of the circumpolar current system into a cyclonic ring of Antarctic Waters.
  • Technical Report
    An acoustic navigation system
    (Woods Hole Oceanographic Institution, 1974-12) Hunt, Mary M. ; Marquet, William M. ; Moller, Donald A. ; Peal, Kenneth R. ; Smith, Woollcott K. ; Spindel, Robert C.
    This report describes a system for underwater acoustic navigation developed, and in use, at the Woods Hole Oceanographic Institution. It includes a brief discussion of the electronic components, operation, mathematical analysis, and available computer programs. There is a series of supplementary Technical Memoranda containing more information on various aspects of the system. We believe that this kind of documentation is more flexible and better meets the needs of potential users than including all technical details in one large volume. These are not final or definitive reports; acoustic navigation capabilities will continue to evolve at W.H.O.I. for some time. Acoustic navigation provides a method of tracking a ship, and an underwater vehicle or instrument package (‘fish’), in the deep ocean. Acoustic devices attached to the ship and fish measure the length of time it takes a sound pulse to travel to acoustic transponders moored on the ocean floor. If the transponder positions and the average speed of sound are known, the ship or fish position can be found.
  • Technical Report
    A computer program for the design and static analysis of single-point subsurface mooring systems : NOYFB
    (Woods Hole Oceanographic Institution, 1976-06) Moller, Donald A.
    This report describes computer program NOYFB, a method of determining the static configuration of sub-surface oceanographic moorings for the purposes of system design and analysis of performance. The program is written in Fortran II for the W.H.O.I. Hewlett-Packard 2100 series shipboard computer systems. The user acts as computer operator in a decision-making capacity, specifying, evaluating and modifying the mooring composition and control and environmental parameters. Operating instructions and the program listing are included as appendices.
  • Technical Report
    A study of CTD cables and lowering systems
    (Woods Hole Oceanographic Institution, 1979-12) Berteaux, Henri O. ; Walden, Robert G. ; Moller, Donald A. ; Agrawal, Yogesh C.
    This study first reviews both the electrical and mechanical modes and causes of failure of electromechanical (E/M) cables used to lower deep sea sensors, such as CTD instruments, from oceanographic ships. It then outlines measures or steps that could be taken to correct some of the deficiencies observed and improve the systems presently used. These measures include quality control, tests, operational limits, improved handling and maintenance, improved machinery. The study then surveys alternative cables for lowering the sensors and convey the information from the sensors back to the ship. These alternatives include strength members other than steel (Kevlar)and signal carriers other than conventional copper conductors (fiber optics). The final section - Conclusions - summarizes the recommendations, based on this study, for improving the reliability of present and future CTD lowering systems.