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- W2077761405 abstract "Data from several current measurement programmes were used to examine the temporal and spatial variability of Chesapeake Bay circulation at time scales of 15 days and longer. First, year-long current records from two stations were analysed for response to runoff, wind stress and gravitational forcing. A strong spring freshet in April resulted in an annual maximum in the longitudinal density gradient, yet the surface current at mid-bay actually declined at the time of this maximum. The reason for this response lies in a prolonged period of northward wind which effectively reduced the strength of the two-layer gravitational flow. This shows that seasonal changes in the wind field can modulate the gravitational flow and that these annual wind shifts are a significant factor in the circulation of this estuary. Statistical analysis also indicates correlation between surface current and longitudinal wind at time scales of 15 days and longer, implying that meteorological effects cannot be completely filtered out at these frequencies. These data demonstrate that Chesapeake Bay circulation, unlike runoff, does not change by orders of magnitude between seasons, indicating that an examination of spatial patterns of circulation can be made using data collected during different deployment periods. A total of 168 current records from 1977 to 1983, averaged over periods of at least 15 days, were used to examine the spatial structure of the mean bay-wide circulation. Surface velocity, while predominantly down-bay, shows considerable longitudinal structure. This is to be expected considering the different meteorological conditions under which the data was collected. However, bottom observations show remarkably coherent up-bay flow regardless of the measurement period, illustrating the dominant role of topography and the importance of the gravitational mode in bay circulation." @default.
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- W2077761405 date "1991-05-01" @default.
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- W2077761405 title "The fortnightly mean circulation of chesapeake bay" @default.
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- W2077761405 doi "https://doi.org/10.1016/0272-7714(91)90034-9" @default.
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