NDLI: Residual circulation and stratification in the Liverpool Bay region of freshwater influence

Content Provider	Springer Nature Link
Author	Verspecht, Florence Rippeth, Tom P. Simpson, John H. Souza, Alejandro J. Burchard, Hans Howarth, M. John
Copyright Year	2009
Abstract	Wind and tidal straining are proposed as key mechanisms influencing the magnitude and timing of the horizontal flux of freshwater across regions of freshwater influence (ROFIs). Evidence for this hypothesis is presented in estimates of the tidally averaged residual current profile, obtained from 5 years of continuous acoustic doppler current profiler measurements in the Liverpool Bay ROFI. The modified horizontal Richardson number ( $R_{x}^{wt}$ ), which includes both the tidal and the wind forcing, was assessed as a measure of stratification. $R_{x}^{wt}$ was found to be a good indicator of the timing of the evolution and destruction of stratification, but was not as successful as an indicator of the magnitude of stratification, both enduring and periodic. The observed mean residual velocities are compared to those predicted by a classical solution, and the eddy viscosity (N z ) is shown to be a control on differences between the observed and predicted circulation. Principal component analysis is used to show that the strongest residual currents occur when the water column periodically alternates between a well-mixed and stratified state, a consequence of straining, rather than simply related to the density gradient. Evidence of wind straining was found in the correspondence between the wind direction and the near surface and near bed residual current direction.
Starting Page	765
Ending Page	779
Page Count	15
File Format	PDF
ISSN	16167341
Journal	Deutsche Hydrografische Zeitschrift
Volume Number	59
Issue Number	5
e-ISSN	16167228
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-09-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Residual circulation Stratification Tidal straining Wind straining ROFI Liverpool Bay Environmental Monitoring/Analysis Fluid- and Aerodynamics Geophysics/Geodesy Meteorology/Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

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