. Collected reprints, Essa Institute for Oceanography. Oceanography 74 FRANK CHEW YUCATAN MIAMI ONSLOW BAY 200 160 120 Cm/sec. Fig. 1. Uncorrected, GEK cross-stream profiles of the surface current at three areas (the respective sources are Texas A&M University, University of M iami, and Woods Hole Oceanographic Institution). corrected GEK feature is suppressed if the same data are grouped into 10 zones of 62 observations each. This appears to be the case for the mean profile reported by Web- ster (1965) for the Florida Current off Miami. It seems, therefore, that the feature
. Collected reprints, Essa Institute for Oceanography. Oceanography 74 FRANK CHEW YUCATAN MIAMI ONSLOW BAY 200 160 120 Cm/sec. Fig. 1. Uncorrected, GEK cross-stream profiles of the surface current at three areas (the respective sources are Texas A&M University, University of M iami, and Woods Hole Oceanographic Institution). corrected GEK feature is suppressed if the same data are grouped into 10 zones of 62 observations each. This appears to be the case for the mean profile reported by Web- ster (1965) for the Florida Current off Miami. It seems, therefore, that the feature is fairly persistent and is used as a conve- nient focus to conduct a limited testing of the adequacy of the approximation that the fc-factor is primarily a function of the surface current relative to the subsurface kinematic structure. The validity of the assumption that the fc-factor has no significant cross- stream variation is also tested by asking whether the cross-stream variation in the approximate A>factor can account for the biaxial feature in the downstream compo- nent. The basic data for the test are those reported by Richardson and Schmitz (1965), who also generously supplied additional unpublished observations. I am indebted to Dr. J. A. Knauss for valuable suggestions and to Dr. F. F. Koczy for his encourage- ment. THE fc-FACTOR An approximation In the absence of geomagnetic storms and away from the edges of a current, Long- uet-Higgins et al. (1954) show that errors in GEK readings are due principally to vertical variations of velocity, horizontal velocity shear, and conductivity of the underlying sea bed. The electrical effect of horizontal shear is proportional to the com- ponent of the earth's magnetic field trans- verse to the direction of the component of velocity of interest. In the Florida Current off Miami, this is the east-west component which, at this location, is fortuitously small relative to the vertical earth component. Thus, error from this sour
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