. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering ^ CURRENT CM/SEC. NIND M/SEC IjWV^'^^^- I I I I I I I I I I I I I I I I I I I I I I I 11 16 21 26 31 JANUARY 1976 Figure 5-12. Low-pass (35-hour) filtered current (upper, cm/sec) and wind (lower, m/sec), from BC-2B 50 m. Tiie wind data are from Fleet Numerical Weather Central estimates. Note the strong wind-driven pulse to the south during 19-23 January. Fig. 5-11 shows concurrent wind and ice conditions. calculations. Vertical coherence was significant
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering ^ CURRENT CM/SEC. NIND M/SEC IjWV^'^^^- I I I I I I I I I I I I I I I I I I I I I I I 11 16 21 26 31 JANUARY 1976 Figure 5-12. Low-pass (35-hour) filtered current (upper, cm/sec) and wind (lower, m/sec), from BC-2B 50 m. Tiie wind data are from Fleet Numerical Weather Central estimates. Note the strong wind-driven pulse to the south during 19-23 January. Fig. 5-11 shows concurrent wind and ice conditions. calculations. Vertical coherence was significant at tidal frequencies everywhere, but at low frequencies only in the coastal regime, perhaps because the water column there is homogeneous, unlike the other two regimes, which have strong stratification (during summer). This stratification may confine responses (, to wind events) to only part of the water column. Horizontally, tidal coherences were large everywhere. Significant low-frequency squared co- herences (~ at 70 km separation) existed over the middle shelf during the summer of 1976, but were lower (~) at similar distances between the middle and coastal regimes (, across the inner front). Coherence squared was low in the outer regime and in the coastal regime, except at tidal frequencies (the number of records and their separations make this a tentative conclusion). The high coherence in the middle regime may be caused by the low background —the amount of low-frequency energy was small, and was mostly forced by wind events which have large spatial scales. Other processes may cause low- frequency motions in the outer and coastal regimes, and these competing processes can lower coherences calculated over long records. At low frequencies the clear meteorologically driven pulses, as illustrated in Figs. 5-10 and 5-12, were observed only over the middle shelf. Some vestige of these was seen in coastal records, but not in the outer regime. It may be that the re
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