. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . T 1—I—\ 1—I—I—I—I—I—r Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1977 1978 Figure 8-12. Variations in the M^ constituent of tiie east component of current at station NC24 for a one-year period beginning September 1977. Upper meter was at a deptii of 24 m (19 m for the last two months). Lower meter depth was 40 m. Phases at both meters also varied. At the upper meter phase decreased from 204° to 190° while at the lower meter phaise increased from 201° to about 217°. This was associat
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . T 1—I—\ 1—I—I—I—I—I—r Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1977 1978 Figure 8-12. Variations in the M^ constituent of tiie east component of current at station NC24 for a one-year period beginning September 1977. Upper meter was at a deptii of 24 m (19 m for the last two months). Lower meter depth was 40 m. Phases at both meters also varied. At the upper meter phase decreased from 204° to 190° while at the lower meter phaise increased from 201° to about 217°. This was associated with a shift in the ellipse axis orienta- tion tow£ird the left at the lower meter while the upper-meter ellipse remained steady. The Ki am- plitudes were also reduced, although to a lesser extent than M2. It is reasonably certain that these changes are associated with ice cover. Whether these phenom- ena were due more to a reduction of mooring noise resulting from wave attenuation by the ice or to frictional effects of ice cover remains unknown. Presumably, mooring noise would increase the amplitudes of all frequencies by more or less the same amount; moreover, phases would not be affected. Nevertheless, mooring noise is probably an important consideration, especially during the stormy fall and spring months. The component harmonic constants for M2, N2, Kj, and Oj were converted to an ellipse representa- tion to give amplitude H and phase G for the major axis, direction of the major axis, amplitude of the minor axis, and sense of rotation. Usually the anal- ysis for the first 29 days of the mooring period was used, to minimize effects of fouling on the current harmonic constants. Table 8-1 gives the results of the analyses for a representative distribution of stations. Some stations were not included because of close proximity to one or more of those listed. Plots of ellipses for stations listed are shown in Figs. 8-13 and 8-14 for the M2 and K, constit
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