The effect of salinity on density in the Leeuwin Current System
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Authors
Huang, Ming-Jer
Subjects
Primitive equation model
Leeuwin Current System
salinity
density
dynamic height
eddies
currents
Leeuwin Current System
salinity
density
dynamic height
eddies
currents
Advisors
Batteen, Mary L.
Date of Issue
1996-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Climatological temperature and salinity fields are used to calculate the salinity contribution to density and dynamic height fields in the Leeuwin Current System (LCS). While the temperature gradient is primarily linear, with warmest water to the north, the salinity fields are spatially inhomogenous. A comparison of density fields, calculated with constant and variable salinity, shows that, off Western Australia, the density field is primarily determined by temperature. Off Southern Australia, the density field is dependent on warm and salty (subtropical) and fresh and cold (sub-Antarctic) water masses. While the dynamic height fields, calculated with constant and variable salinity, show similar flow patterns off Western Australia, different flow patterns are found off Southern Australia. In addition to the analysis of climatological fields, a primitive equation ocean model is used to investigate the role of salinity in the formation of currents and eddies in the LCS. Two identical ocean models, one with a climatological salinity field and the other with no horizontal salinity gradients, are run and compared with each other. Despite the model runs being initialized with similar temperature distributions, there are relatively large temperature and density differences in the Southern Australian region, due to the advection of water masses by the Leeuwin Current. Based on the climatological analyses and the results of the model experiments, it is concluded that, descriptively and dynamically, both temperature and salinity are essential to accurately characterize the large-scale circulation of the LCS
Type
Thesis
Description
Series/Report No
Department
Physical Oceanography
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
NPS-OC-96-001
Sponsors
This thesis was prepared in conjunction with research sponsored in part by the
National Science Foundation, 4201 Wilson Boulevard, Arlington, VA 22230.
Funding
Format
60 p.: ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.