GUSREX
type: Concept
in scheme: projects
definition: Gulf Stream Recirculation Experiment (GUSREX) and Line Experiment SOFAR Float Data 1980-1982 by M.A.Kennelly & T.K. McKee This also pertains to Gulf Stream (GS), Long Range (LR) and Ring (RI) Experiments DATA PROCESSING Processing at the University of Rhode Island Initial data processing and float tracking were done at URI under the supervision of H. T. Rossby. This consisted of subdividing the ALS records into individual float files. The signals for an individual float were extracted from the ALS data, and the floats were tracked in two steps. First, the three ALSs which best surrounded a float geographically were used to track it hyperbolically, giving a series of positions and the time that the float emitted the tracking signal. These signaling times were used to obtain an initial offset and drift rate for the float's clock. Then, the best pair of receivers were used to track the float with circular (range-range) navigation using the clock corrections and speed of sound corrections. The tracking procedure during GUSREX was identical to that used for previous SOFAR float experiments and described by Spain, O'Gara, and Rossby (1980). The three daily times of arrival (TOA) of each SOFAR float's acoustic signal were low-pass filtered and smoothed using a least squares polynomial fit averaged over 11 observations (3 2/3 days) which corresponds to a half power of 1.5 days. Float positions were obtained from the smoothed TOAs using range- range tracking. The final float trajectories were then smoothed with a filter similar to that used on the TOA's. A "master position" tape containing indi- vidual float trajectories smoothed to 3 positions per day was prepared and sent to Woods Hole Oceanographic Institution (WHOI) and this was used for our sub- sequent processing and data reduction. For each position, a smoothed velocity and 48 hour average of temperature and pressure are included. Temperature and pressure, telemetered from the float on alternate days (Spain et al., 19…

G - I
type: Concept