. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Tides 123 marine organisms, resulting in lower recorded speeds. To examine temporal variability, successive 29-day harmonic tide analyses were performed on all avail- able current-meter data. Analyses were performed on the east and north components of velocity. Several moorings had decreases in tidal amplitudes cor- responding to times of ice cover. Generally, the semidiurnal constituents were reduced more than the diurnal constituents, and reductions were greate
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Tides 123 marine organisms, resulting in lower recorded speeds. To examine temporal variability, successive 29-day harmonic tide analyses were performed on all avail- able current-meter data. Analyses were performed on the east and north components of velocity. Several moorings had decreases in tidal amplitudes cor- responding to times of ice cover. Generally, the semidiurnal constituents were reduced more than the diurnal constituents, and reductions were greatest for the upper meters. Phases were also affected. Fig. 8-12 shows variations in the M2 constituents of the east component of current at station NC24 at depths of 24 m and 40 m for a one-yeair period beginning 19 September 1977 (the north component exhibited similar behavior). Ice began forming in the area of the mooring in late November and early December of 1977 (Fleet Weather Facility 1977 and 1978); this ice formation was associated with a decrease in the M2 amplitude at the upper meter to 18 cm/sec. However, the amount of ice over the mooring and the location of the ice edge varied until February 1978, when the ice edge moved much further south. Amplitudes were lowest in February and March during the time of extensive ice cover and then increased again as the ice broke up. Amplitudes were reduced by almost 40 percent, from 22 cm/sec in the early fall to about 14 cm/sec during late winter. During the summer 1978 amplitudes returned to over 20 cm/sec. The effect was much less at the lower meter. Amplitudes were decreased from cm/sec to about cm/sec or less than 20 percent. 220n p^ ^ o'ower meter. 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 2
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