Meso-scale perturbations and thermohaline fronts in the south atlantic ocean |
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| Institution: | 1. School of Earth, Ocean, and Climate Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, Odisha 752 050, India;2. National Center for Atmospheric Research, Boulder, CO 80301, USA;1. Earth & Planetary Sciences, The Johns Hopkins University, Baltimore, MD, USA;2. Applied Physics Laboratory, University of Washington, WA, USA;3. Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany;4. Norwegian Polar Institute, Fram Centre, Tromsø, Norway;5. Ocean Atmosphere Systems GmbH, Hamburg, Germany;6. Finnish Meteorological Institute, Helsinki, Finland;7. NIOZ Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands;8. Climate Change Research Centre, University of New South Wales, Sydney, Australia;1. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India;2. Research Institute for Humanity and Nature, Kyoto, Japan;3. Centre of Advanced Study in Geology, Kumaun University, Nainital, Uttarakhand, India;4. School of Earth Ocean and Climate Sciences, Indian Institute of Technology, Bhubaneswar, India;5. Mausam Vihar, New Delhi, India;1. Indian Institute of Tropical Meteorology, Pune, Ministry of Earth Sciences, India;2. Savitribai Phule Pune University, Pune, India |
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| Abstract: | A linear quasi-geostrophic model and a non-linear balanced model are used to study the properties of the oceanic baroclinic waves. From a linear point of view, the oceanic meso-scale (200–400 km) disturbances found near the Brazil and Falkland currents confluence zone seem to be generated by baroclinic instability. Non-geostrophic and non-linear effects due to a single original wave are superimposed on the linear fields associated with the most unstable wave. Characteristics very similar to observations are obtained in the evolution to finite amplitude. The evolution of oceanic thermal rings is very well reproduced by the non-linear model. However, the stage of saturation is not reached in the model results since the feedback to the thermal basic state is not included. |
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