Large eddy simulations of mixed layer instabilities and sampling strategies |
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| Institution: | 1. RSMAS, University of Miami, Miami, FL, United States;2. Department of Mathematics, College of Staten Island, Staten Island, NY, United States;3. Math. and Computer Sci. Division, Argonne National Laboratory, Argonne, IL, United States;1. School of Mathematics and Statistics, Xi’an Jiaotong University, Xi’an, 710049, PR China;2. Department of Mathematics, Nanjing University, Nanjing, 210093, PR China;1. Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia;2. Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia;3. School of Physical, Environmental and Mathematical Sciences, University of New South Wales Canberra at the Australian Defence Force Academy, Australian Capital Territory, Australia;4. Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, Hobart, Tasmania, Australia;5. Climate Change Research Centre, University of New South Wales, Sydney, New South Wales, Australia;6. CSIRO Wealth from Oceans Research Flagship, Hobart, Tasmania, Australia;7. ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales, Australia |
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| Abstract: | Recognizing the potential role played by submesoscale processes in both the energy cascade in the ocean and biogeochemical transport, we conduct a series of large eddy simulations of isolated mixed layer instabilities. The primary objective is to generate freely evolving velocity and density fields representative of submesoscale flows and then use these to examine potential observational sampling strategies. Mixed layer instabilities are explored in two parameter regimes: a strongly-stratified regime which results in a system with surface-intensified eddies and high vertical shear, and a weakly-stratified regime exhibiting weaker, smaller scale eddies that penetrate across the entire domain depth as Taylor columns. Analysis of a variety of mixing measures derived from both particle and tracer based sampling strategies indicates the differing importance of vertical processes in the two flow regimes. |
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