A Fine Resolution Model of the Leeuwin Current System Off Western and Southern Australia PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Fine Resolution Model of the Leeuwin Current System Off Western and Southern Australia PDF full book. Access full book title A Fine Resolution Model of the Leeuwin Current System Off Western and Southern Australia by Robyn L. Phillips. Download full books in PDF and EPUB format.
Author: Robyn L. Phillips Publisher: ISBN: 9781423507093 Category : Languages : en Pages : 107
Book Description
To investigate the role of wind forcing, bottom topography and thermohaline gradients in the Leeuwin current System (LCS) off western and southern Australia, several experiments are conducted with a sigma coordinate primitive equation model on a beta-plane. Results show that off the west (southern) coast the LCS is an anomalous eastern boundary current system that generates a coastal poleward (eastward) current, an equatorward (westward) undercurrent, and highly energetic mesoscale features such as meanders and eddies. Off the west coast, thermaohaline forcing, wind forcing and bottom topography all play important roles: Thermaohaline gradient effects are shown to be the primary mechanism in the generation of the poleward current, equatorward undercurrent, eddies and meanders. Inshore of the poleward surface flow, next to the coast, wind forcing also plays an important role in generating an equatorward coastal current and upwelling. Bottom topography is responsible for strengthening and trapping currents near the coast, intensifying eddies off capes and in preventing the undercurrent from becoming the dominant surface flow. Bottom topography is also shown to play a dominant role off the southern coast in trapping the eastward Leeuwin Current and the westward Flinders Current over the shelf break and slope, respectively. Overall, the results of the study compare well with available observations and previous studies of the LCS.
Author: Robyn L. Phillips Publisher: ISBN: 9781423507093 Category : Languages : en Pages : 107
Book Description
To investigate the role of wind forcing, bottom topography and thermohaline gradients in the Leeuwin current System (LCS) off western and southern Australia, several experiments are conducted with a sigma coordinate primitive equation model on a beta-plane. Results show that off the west (southern) coast the LCS is an anomalous eastern boundary current system that generates a coastal poleward (eastward) current, an equatorward (westward) undercurrent, and highly energetic mesoscale features such as meanders and eddies. Off the west coast, thermaohaline forcing, wind forcing and bottom topography all play important roles: Thermaohaline gradient effects are shown to be the primary mechanism in the generation of the poleward current, equatorward undercurrent, eddies and meanders. Inshore of the poleward surface flow, next to the coast, wind forcing also plays an important role in generating an equatorward coastal current and upwelling. Bottom topography is responsible for strengthening and trapping currents near the coast, intensifying eddies off capes and in preventing the undercurrent from becoming the dominant surface flow. Bottom topography is also shown to play a dominant role off the southern coast in trapping the eastward Leeuwin Current and the westward Flinders Current over the shelf break and slope, respectively. Overall, the results of the study compare well with available observations and previous studies of the LCS.
Author: Christopher L. Butler Publisher: ISBN: Category : Ocean currents Languages : en Pages : 0
Book Description
A high-resolution, multi-level, primitive equation ocean model is used to examine the response of an eastern boundary oceanic regime to thermal and wind forcing. The focus of this study is the anomalous Leeuwin Current System off Western and Southern Australia. Three types of experiments are conducted. The first type forces the model from rest with the Indian Ocean climatological temperature gradient as an initial condition only, while the second type repeats the first experiment with the added contribution of the North West Shelf water temperature profile. The role of irregular coastline geometry on the generation of currents and eddies is also examined by comparing these cases with and without an irregular (realistic) coastline. The third type, with an irregular coastline, forces the model from rest with constant thermal and wind forcing. A one-time application of the North West Shelf water is added during the model run. In all experiments, surface currents, undercurrents, meanders, and eddies are generated. The results from experiments with an irregular, rather than an idealized coastline, show preferred eddy generation locations. The results from the third type of experiment. which has the most realistic features, agrees well with available observations off Western and Southern Australia. These results support the hypothesis that both thermal and wind forcing are important mechanisms for the generation of many of the observed features in the Leeuwin Current System.
Author: Christopher L. Butler Publisher: ISBN: Category : Ocean currents Languages : en Pages : 146
Book Description
A high-resolution, multi-level, primitive equation ocean model is used to examine the response of an eastern boundary oceanic regime to thermal and wind forcing. The focus of this study is the anomalous Leeuwin Current System off Western and Southern Australia. Three types of experiments are conducted. The first type forces the model from rest with the Indian Ocean climatological temperature gradient as an initial condition only, while the second type repeats the first experiment with the added contribution of the North West Shelf water temperature profile. The role of irregular coastline geometry on the generation of currents and eddies is also examined by comparing these cases with and without an irregular (realistic) coastline. The third type, with an irregular coastline, forces the model from rest with constant thermal and wind forcing. A one-time application of the North West Shelf water is added during the model run. In all experiments, surface currents, undercurrents, meanders, and eddies are generated. The results from experiments with an irregular, rather than an idealized coastline, show preferred eddy generation locations. The results from the third type of experiment. which has the most realistic features, agrees well with available observations off Western and Southern Australia. These results support the hypothesis that both thermal and wind forcing are important mechanisms for the generation of many of the observed features in the Leeuwin Current System.
Author: Caroline C. Ummenhofer Publisher: Elsevier ISBN: 0128232862 Category : Science Languages : en Pages : 514
Book Description
The Indian Ocean and its Role in the Global Climate System provides an overview of our contemporary understanding of the Indian Ocean (geology, atmosphere, ocean, hydrology, biogeochemistry) and its role in the climate system. It describes the monsoon systems, Indian Ocean circulation and connections with other ocean basins. Climatic phenomena in the Indian Ocean are detailed across a range of timescales (seasonal, interannual to multi-decadal). Biogeochemical and ecosystem variability is also described. The book will provide a summary of different tools (e.g., observations, modeling, paleoclimate records) that are used for understanding Indian Ocean variability and trends. Recent trends and future projections of the Indian Ocean, including warming, extreme events, ocean acidification and deoxygenation will be detailed. The Indian Ocean is unique and different from other tropical ocean basins due to its geography. It is traditionally under-observed and understudied, yet plays a fundamental role for regional and global climate. The vagaries of the Asian monsoon affect over a billion people and a third of the global population live in the vicinity of the Indian Ocean. It is also particularly vulnerable to climate change, with robust warming and trends in heat and freshwater observed in recent decades. Advances have recently been made in our understanding of the Indian Ocean's circulation, interactions with adjacent ocean basins, and its role in regional and global climate. Nonetheless, significant gaps remain in understanding, observing, modeling, and predicting Indian Ocean variability and change across a range of timescales. As such, this book is the perfect compendium to any researcher, student, teacher/lecturer in the fields of oceanography, atmospheric science, paleoclimate, environmental science, meteorology and geology, as well as policy managers and water resource managers. - Provides interdisciplinary content with a comprehensive overview for students and practitioners from a wide range of disciplines as well as for stakeholders - Presents a broad overview and background on the current state of knowledge of the variability, change, and regional impacts of the Indian Ocean - Includes links to animations, slideshows, and other educational resources
Author: Anthony W. Cox Publisher: ISBN: 9781423555728 Category : Languages : en Pages : 141
Book Description
A high resolution, multi-level, primitive equation ocean model is used to investigate the effects of seasonal thermohaline gradients and wind forcing in the generation of currents and eddies off the western and southwestern coasts of Australia. Additionally, an investigation of the generation mechanisms for undercurrents in the region is conducted. Model results demonstrate the roles of seasonal thermohaline gradients, wind forcing, and North West Shelf waters in the Leeuwin Current System. While the basic flow is poleward and eastward off the western and southern coasts, due to strong thermohaline gradients, there is significant variability in the flow from the seasonal nature of the wind forcing and the onset of the North West Shelf waters. Model results also indicate that an equatorward (westward) undercurrent off the western (southwestern) coast of Australia is generated and maintained due to the conservation of mass continuity in response to an alongshore thermohaline gradient at deeper levels.
Author: Robyn L. Phillips
Author: Robyn L. Phillips
Author: Christopher L. Butler
Author: Christopher L. Butler
Author: 
Author: 
Author: United States. Naval Postgraduate School, Monterey, CA.
Author: United States. Naval Postgraduate School, Monterey, CA.
Author: Caroline C. Ummenhofer
Author: 
Author: Anthony W. Cox