ARCTIC A Description of Summer Physical Oceanographic Conditions
ABSTRACT. Measurements of current velocity, temperature, salinity, and water level were made over a period of two months in Rupert Bay, James Bay (Canada). From an analysis of the current meter time series, the circulation and distribution of physical properties were found to be dominated by the tid...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1991
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.1619 http://pubs.aina.ucalgary.ca/arctic/Arctic45-3-258.pdf |
| Summary: | ABSTRACT. Measurements of current velocity, temperature, salinity, and water level were made over a period of two months in Rupert Bay, James Bay (Canada). From an analysis of the current meter time series, the circulation and distribution of physical properties were found to be dominated by the tides, with the semi-diumal component being the predominant component. An analysis of variance revealed that 77 % of the salinity variations were related to the tides. Vertically homogeneous conditions prevailed in many areas because of a large tidal amplitude/depth ratio of 0.625, causing intense mixing in two-thirds of the estuary. Non-tidal velocity components were found to be 0(1) less than tidal currents, with the long-term mean circulation directed out of the bay. Non-tidal water level variations were well correlated with the wind. The maximum cross-correlation coefficient was calculated to be 0.77 for a 7 hour lag. The centrifugal force, Coriolis force, and baroclinic pressure gradient were dominant forces driving the secondary flows of the bay. Tidal fronts were found to be either aligned parallel to the main axes of principal channels or around small downstream islands with the arrangement influenced by bottom topography. Key words: estuary, circulation, tides, salinity, mixing, secondary flow, front RÉSUMÉ. Des données de vitesse de courant, de température, de salinité et de niveau d’eau furent échantillonnées pendant une période de deux mois dans la Baie de Rupert, Baie James (Canada). Suite à l’analyse des séries chronologiques alors obtenues, il apperait que la circulation et la répartition des propriétés physiques étaient déterminees par les marées et que la constituante semi-diurne y dominait toute autre constituante de la marée. Une ‘analyse de variance a révélé que 77 % des variations de la salinité étaient attribuables aux marées semi-diume. L’homogénéité de la colonne d’eau |
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