The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberings00hood Year: 1981 122 Physical oceanography BC-20 3 3 15 17 APR 1980 1 1—r^—r 23 25 27 29 • NEW MOON C FIRST QUARTER O FULL MOON 3 LAST QUARTER A - MOON IN APOGEE P - MOON IN PERIGEE S - MOON FARTHEST SOUTH OF EQUATOR E - MOON ON EQUATOR N - MOON FARTHEST NORTH OF EQUATOR Figure 8-11. Predicted tides for the month of April 1980 for selected stations, illustrating tidal types found in the Bering Sea. Predictions used M^, N^, S^, K, , 0, , and P
The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberings00hood Year: 1981 122 Physical oceanography BC-20 3 3 15 17 APR 1980 1 1—r^—r 23 25 27 29 • NEW MOON C FIRST QUARTER O FULL MOON 3 LAST QUARTER A - MOON IN APOGEE P - MOON IN PERIGEE S - MOON FARTHEST SOUTH OF EQUATOR E - MOON ON EQUATOR N - MOON FARTHEST NORTH OF EQUATOR Figure 8-11. Predicted tides for the month of April 1980 for selected stations, illustrating tidal types found in the Bering Sea. Predictions used M^, N^, S^, K, , 0, , and P, . Examples of different tide types are shown in Fig. 8-11, which shows predicted tide curves for the month of April 1980. Station BC9, southwest of Nunivak Island near the diurnal amphidrome, has an F-value of and is mainly semidiurnal. The lunar perigee is on the 14th with the largest range on about April 18 and the smallest at the beginning and end of the month. BC2 in Bristol Bay has the mixed semi- diurnal type with F = The inequalities are largest after maximum declination of the moon on the 7th and 20th. BC20, near St. Matthew Island, also has a mixed semidiurnal tide, F - Note that while at BC2 the diurnal inequality is mainly in the low tide, at BC20 it is in both the high and low waters. This is caused by differences in the phase relationships between the major diurnal (Oi + Ki) tides and Mj. Finally, the regular diurnal tide type is found at LD5, near the semidiurnal amphidrome in Norton Sound. Here F = and the fortnightly tropic-equatorial tide cycle, caused by the declination of the moon, is evident. Tidal current observations Harmonic constants of current-meter data are subject to more variability in time and space than those of pressure-gauge data, which are generally quite stable. A variety of factors affect observed tidal current velocities, including local bathymetry and depth, shear in the water column, and increased damping and f
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