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Subsurface currents in the Strait of Georgia, west of Sturgeon Bank Chang, Phillip Yit Kuen
Abstract
Spectral characteristics of sub-surface current and temperature records spanning 310-533 days from me Strait of Georgia near Sturgeon Bank are examined. Of particular interest are low-frequency fluctuations having, a characteristic period of 30 days. Typically, the energy of the low-frequency and tidal currents are equal at 50m (each about 40% of the total), and 10% and 10%, respectively, at 200m. Low-frequency currents are observed to be baroclinic and posses a lateral length scale less than 10km. Their generation mechanisms are not identified. The low-frequency fluctuations in sea-level and current have poor-to-fair coherence, while those in air-pressure and current have poor coherence. Low-frequency fluctuations in wind and current have fair coherence at the eastern mooring, and poor coherence at the remaining two moorings. Fluctuations in water temperature have a characteristic period of 300 days. Water temperatures at different locations generally have poor coherence except at the lowest frequencies where they are fair-to-good. Water temperature and current at the same location have poor coherence. Tidal currents are found to be ellipses, with the largest constituents being M² and K¹. The magnitude, shape .and orientation of the tidal current ellipses are time-dependent. Internal tides are suggested as an explanation.
Item Metadata
Title |
Subsurface currents in the Strait of Georgia, west of Sturgeon Bank
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1976
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Description |
Spectral characteristics of sub-surface current and temperature records spanning 310-533 days from me Strait of Georgia near Sturgeon Bank are examined. Of particular interest are low-frequency fluctuations having, a characteristic period of 30 days. Typically, the energy of the low-frequency and tidal currents are equal at 50m (each about 40% of the total), and 10% and 10%, respectively, at 200m.
Low-frequency currents are observed to be baroclinic and posses a lateral length scale less than 10km. Their generation mechanisms are not identified. The low-frequency fluctuations in sea-level and current have poor-to-fair coherence, while those in air-pressure and current have poor coherence. Low-frequency fluctuations in wind and current have fair coherence at the eastern mooring, and poor coherence at the remaining two moorings.
Fluctuations in water temperature have a characteristic period of 300 days. Water temperatures at different locations generally have poor coherence except at the lowest frequencies where they are fair-to-good. Water temperature and current at the same location have poor coherence.
Tidal currents are found to be ellipses, with the largest constituents being M² and K¹. The magnitude, shape .and orientation of the tidal current ellipses are time-dependent. Internal tides are suggested as an explanation.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-02-09
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0093825
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.