期刊
FLUIDS
卷 5, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/fluids5030159
关键词
mesoscale/submesoscale interaction; kinematics; Lagrangian drifters
资金
- Gulf of Mexico Research Initiative [GR009731]
- Office of Naval Research [N000141812138]
- Cooperative Institute for Marine and Atmospheric Studies (CIMAS)
- University of Miami
- NOAA [NA10OAR4320143]
- NOAA/AOML
- U.S. Department of Defense (DOD) [N000141812138] Funding Source: U.S. Department of Defense (DOD)
Much of the vertical transport near the surface of the ocean, which plays a critical role in the transport of dissolved nutrients and gases, is thought to be associated with ageostrophic submesoscale phenomena. Vertical velocities are challenging not only to model accurately, but also to measure because of how difficult they are to locate in the surface waters of the ocean. Using unique massive drifter releases during the Lagrangian Submesoscale Experiment (LASER) campaign in the Gulf of Mexico and the Coherent Lagrangian Pathways from the Surface Ocean to the Interior (CALYPSO) experiment in the Mediterranean Sea, we investigate the generation of submesoscale structures along two different mesoscale fronts. We use a novel method to project Lagrangian trajectories to Eulerian velocity fields, in order to calculate horizontal velocity gradients at the surface, which are used as a proxy for vertical transport. The velocity reconstruction uses a squared-exponential covariance function, which characterizes velocity correlations in horizontal space and time, and determines the scales of variation using the data itself. SST and towed CTD measurements support the findings revealed by the drifter data. Due to the production of a submesoscale instability eddy in the Gulf of Mexico, convergence magnitudes of up to similar to 20 times the planetary vorticity,f, are observed, the value of which is almost 3 times larger than that found in the mesoscale dominated Western Mediterranean Sea.
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